green roof dead load psf

A progression for design of a typical green roof consists of the following 12 steps. Readers can also consult with a professional skilled in green roof design for design guidance. (cubic feet) of water as determined according to ASTM E2397). Roof Material Dead Load Table. Green Roofs in Sustainable Landscape Design. Because green roof technology is new to the North American market, city officials may not be familiar with the systems requirements and considerations. New York City provides a similar credit for green roofs. 1.2D + 1.0E + L + 0.2S When H loads are present, they shall have 6. grants, review of shop drawings, and permits). Common materials used for root barriers include PVC, TPO, and polyethylene. The following components are part of almost all green roofs. Snodgrass, E.C., and L.L. Leak detection of green roof assemblies that incorporate root-barriers is very challenging, if not impossible in most instances. Maximum system dead load of ___psf (determined according to ASTM E 2397 – 05 and E 2399 – 05). For a 16-foot rafter, this then results in a 352 lbs. Leak detection systems allow for pinpointing the exact location of leaks and can also detect small imperfections in the waterproofing. Weight loadings are therefore likely to be an underestimate. For example, Appendix A indicates that one type of clay tile roof system has a live load value of 20 psf and a dead load value of 15 psf. An architect is a person licensed in the art of planning, designing and overseeing the construction of buildings. Potential roles in green roof design. On accessible roofs, amenities include walkways, gathering areas, site furniture, water features, lighting, other structural elements such as trellises and arborwalkways. “A combination of organic and inorganic matter than anchors plant roots, drains water from the roof, and sustains plant growth.” ([[References for green roofs|Green Roofs for Healthy Cities and the Cardinal Group, 2006) Growing medium characteristics that affect stormwater performance include the following. Popular Pages Pole Framing Post Connection Post Embedment Post Frame Foundations Rafter Installation Pole Barn Roof Weights Roof Styles Truss Bracing Trusses. Water retention layers are available in a range of water holding capacities, typically between 0.06 gal/ft2 and 0.16 gal/ft2. Conducts energy modeling analysis to reduce HVAC requirements. See, for example, Berndtsson (2010) for an overview of slope impact on stormwater performance of green roofs. A one-way concrete slab system with beams and girders was designed for a typical 30’-0” x 30’-0” bay with typical 24” x 24” columns. Descriptions of these techniques are provided in ASTM Standard Methods D6747 and D7007. Under the roof ballast or pavers, the assembly is typically the same as for the green roof. Even with reinforcement, slopes should be limited. Poor design can lead to structural failure of a green roof. The ANSI/SPRI VF-1 External Fire Design Standard for Vegetative Roofs provides guidance for minimizing the risk of fire on green roofs, including recommendations for location and width of vegetation free zones for fire safety. For this reason there are few, if any, initial capital costs. Provides technical information on the cost of construction (market prices, labor, materials, transportation, etc). stormwater, wildlife, aesthetics, food production; building code and insurance requirements, where applicable; how soon full vegetation cover is desired; maintenance labor, accessibility, and budget. May conduct site analysis to reduce or eliminate internal drains. In addition to the information provided on this page, we recommend the following references, which address green roof design. runoff harvested from impervious surfaces, water harvested from air conditioning effluent, grey water harvested from baths, showers, and sinks. Reviews the distribution of material and equipment during construction. Permeability affects how quickly water moves through the growing medium. Drainage capacity must also account for vertical sheet flow from adjacent facades or tall parapets. DEAR ROB: 10 psf dead load is primarily to cover weight of ceiling gypsum wallboard. Green roof products shall be fully compatible with the waterproofing system and shall be installed in a manner that does not negatively impact waterproofing assembly in any way. - See the section on Cost-benefit considerations for green roofs. Monitors construction compliance with plans and specifications. This is especially true of intensive green roofs, which can have soil that is two feet deep or more. Total Dead Load = 38 psf Factored Loading: 1.2 D + 1.6 (L ) + 0.5 ( S) = 1.2 (8 psf) + 1.6 (30 psf) + 0.5 (30 psf) = 72.6 psf Extensive Green Roof Loading: Live Load: 30 psf Snow Load: 30 psf Extensive Green Roof System: 26 psf Total Live Load = 30 psf Total Dead Load = 56 psf The primary reason for not providing design specifications is that each green roof is unique and needs to be designed considering the factors discussed in this article. While green roofs are designed to retain and detain stormwater and supply vegetation with the water they need, drainage components are also needed to remove excess water. In most applications a cushioning layer will be installed on top of the waterproofing or root-barrier to resist strains induced by point loads or puncture from sharp protections. “A light-weight, rot-proof material placed over or included as a part of the drainage layer to keep the growing medium in place and thereby prevent fine particles from blocking the drainage system.” (Green Roofs for Healthy Cities and the Cardinal Group, 2006). Dead load on 18 Gage N-Deck is 85 psf and less than the126 psf allowed. Some landscape architects are skilled in the integration of building requirements and ecological and environmental design issues. Determines occupancy requirement for fire codes. Each of these is discussed in greater detail below. If leak detection is desired, ensure green roof system is designed to be compatible with leak detection, as leak detection of green roof assemblies that incorporate root-barriers is very challenging, if not impossible, in most instances. Load on 12/12 pitch roof. Roof shall balance drainage and water retention to meet drainage requirements but retain as much rain as possible while still meeting drainage and maximum wet weight dead load requirements. The University of Melbourne’s demonstration green roof is designed for use by visitors and staff. ft. Live load on attic floor = local requirements. Even green roofs with underground drip irrigation systems will need overhead watering until the roots have grown enough to reach water from the irrigation driplines. Ensuring that installation is carried out in accordance with local standards and incentive program performance requirements (if available). Many different types of irrigation systems exist, including manual or automated spray systems, drip, and flood irrigation systems. This protection layer is a water-permeable, synthetic fiber material with good puncture resistance. The weight of the landscaping materials shall be considered as dead load and shall be computed on the basis of saturation of the soil. Provides vital technical data (i.e. ft.) that have a waterproofing layer anchored with stone ballast. lusher vegetation and moister soils provide greater evapotranspiration; sustainable use of stormwater harvested from hard surfaces, where harvested water is available; aesthetics: plants look greener more of the time; and. Green roofs may include vegetation free zones designed to. © 2020 by Minnesota Pollution Control Agency Consequently, Sedum-based extensive profiles may qualify as ‘fire breaks’ on otherwise intensive green roof projects. W.W.Norton, NY. Assemble a team to fit project budget and goals and level of complexity. Some techniques that can be used to protect soil from eroding include erosion control blanket, mats, or soil tackifier.Care must be taken not to damage waterproofing membrane when securing erosion control fabric. climate and microclimate (e.g. Dunnett, N., and N. Kingsbury. Heavier intensive green roofs generally require a concrete supporting deck. Efficient irrigation is not expected to decrease stormwater benefits of green roofs, since lusher vegetation and moister soils provide greater evapotranspiration. One important item to design for is an increased structural load. For smaller projects, other members of the design team generally fulfill this role. Timber Press, Portland OR. Leak testing, while a prudent precaution and check, is not a substitute for craftsmanlike installation of the waterproofing layer. An independent roofing professional who provides information pertaining to the roof membrane, waterproofing, and determines what system would be best suited to the roof. Depending on the project, additional roles not shown in the table may be needed. Examples of performance goals are listed below. Testing right after waterproofing is installed allows for correction of any leaks prior to installing the green roof. Specialists retained to design irrigation. Mechanical engineers design the heating, cooling, and ventilation systems for a building. In most assemblies, a fabric is selected that will freely admit plant roots. Vegetated roofs shall retain a minimum of "x" c.f. Additionally, live loads were increased to 100 PSF on all portions of the roof to accommodate pedestrian access. The growing and drainage media for the intensive beds and planters was also provided by SkyGarden. Mid-range, 5-inch, systems weigh approximately 34 pounds per square foot and are compatible with wood or steel decks. A structural engineer’s advice is essential to ensure comprehensive design development, based on the building’s construction, condition and weight loading capacity. Damage to a wall can arise from wind forces, plant load, cable tension, and human access. Inspects roof installation on behalf of the architect for quality control. Drainage components typically include the following. A cost estimator calculates how much the green roof will cost during construction and during a determined maintenance period. The values for dead loads in Table 3.2 are for commonly used materials and … Drawings for drainage and water inside the building. Mandel, L., 2013, EAT UP; The Inside Scoop on Rooftop Agriculture. Paper work associated with the green roof (e.g. Some projects will not need all these steps, some projects may need additional steps, and the order may need to be changed for some projects. A typical value for the roofing material itself is 10 PSF. Designed by Gimmeblogs The root barrier is sometimes part of the drainage board. Kits for All Purpose Buildings. A green roof with 8 inches of substrate and plantings adds 56 psf to dead load. Factors That Influence . Testing after all construction traffic on the roof is complete will detect whether or not any leaks developed between the time of the first leak detection test and the completion of all subsequent work on the roof. 2004. While some waterproofing membranes can resist roots on their own, many will require an additional component to protect the waterproofing membrane from root damage. The uniform design live load in unoccupied landscaped areas on roofs shall be 20 psf (0.958 kN/m 2). For a green roof, wall or facade, the loads that the building structure must support include: It is important to consider not just the weight of plants when planted but their weight at maturity, especially where shrubs and trees are proposed, as these are likely to be significantly heavier over time. jQuery(document).ready(function(jQuery){jQuery.datepicker.setDefaults({"closeText":"Close","currentText":"Today","monthNames":["January","February","March","April","May","June","July","August","September","October","November","December"],"monthNamesShort":["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],"nextText":"Next","prevText":"Previous","dayNames":["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"],"dayNamesShort":["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],"dayNamesMin":["S","M","T","W","T","F","S"],"dateFormat":"MM d, yy","firstDay":1,"isRTL":false});}); Existing structure and size, access and nearby vegetation, Sourcing skills, expertise and information, Building rating schemes and planing assessment tools, Victorian Desalination Project Green Roof, Dead load – the final constructed weight of all built elements and all components associated with the roof or wall assembly, including plants, growing substrate and any water held in the system, Live load – the weight of people who will use the space, and of any mobile equipment that will be used periodically on the site, for example, maintenance (live load generally applies to green roofs, not facades or walls, however it would be appropriate on a vertical surface if a trafficable maintenance platform was built into the system), Transient load – moving, rolling or short-term loads, including wind and seismic activity. Periodically check the roof for leaks as part of a maintenance program. Portions of the green roof above and below 6 inches, with a minimum of 25% of green roof area above or below 6 inches, Varies, but generally lower than for intensive green roofs, Varies, but generally higher than for extensive green roofs, More growing medium and more vigorous plant growth provides marginally greater stormwater volume benefits, Quick, 1-2 years depending on species, plug size, and initial planting density, Allows for most flexible and controlled planting design; can be added to green roofs started from cuttings or to pre-grown mats to increase species diversity, Small pieces of sedums that are spread across or mixed into growing medium, Less control over final look than with plugs, Longer than plugs or cuttings – typically 2-5 years depending on species, Less control over final look than with plugs; seed cannot be allowed to dry out until germinated; more bare soil can result in higher weed pressure; need more erosion protection during establishment since soil is bare; only a limited number of species can germinate from seed on a green roof, Plants delivered to the site pre-grown into an erosion control mat with growing medium, Instant erosion protection if fully vegetated; precise plant composition difficult to predict; less control over final look; less species diversity possible than with plugs, can be combined with plugs to increase species diversity, Plastic, metal, or degradable trays filled with growing medium and delivered to site pre-grown, Allow for greater precision of design, some may require frequent plant replacement due to edge effect; some trays may retain heat and cause soil to dry out faster, negatively affecting plant health. 0.9D + 1.0W a load factor of 1.6 when adding to load 7. These vegetation free zones are most often located at a minimum around the roof perimeter and around roof drains and other penetrations. Exposure B. Remember, these loads are distributed uniformly over the entire surface of the roof. For example, Philadelphia businesses can apply for a Green Roof Tax Credit that will provide a rebate for 25 percent of green roof costs up to $100,000. Evaluates suitability of existing waterproofing for green roof. Comparison of most common extensive green roof planting methods Provides electricity needed on the green roof for irrigation as well as anything else that required electricity on the roof. Consult with a roofing consultant or other qualified professional to design the waterproofing assembly for a new roof, or to evaluate an existing roof on which the green roof will be installed. The Venny green roof, Melbourne. The following table shows some of the pros and cons of some potential green roof vegetation installation techniques. An engineered slope stability analysis should be performed for green roofs with slopes above 2:12 (10 degrees). Intensive green roofs almost always need a permanent irrigation system, depending on factors such as project goals and plant palette. Vegetated roofs shall retain a minimum of "x" c.f. In summary, intensive green roofs typically have slightly higher stormwater volume benefits, but also have higher installation and maintenance costs and require more structural capacity compared to semi-intensive and extensive green roofs. While a simple manual overhead system is less expensive, drip systems are typically more water efficient than overhead systems and provide more uniform coverage. Soil moisture sensors can be used to program irrigation to only be activated when soil is dry and plants need water Green roof products shall protect waterproofing system from damage, including but not limited to damage caused by UV (ultraviolet) radiation, hail, physical abuse or tears, rapid temperature fluctuation, or water vapor. • Powered by MediaWiki, Estimate design, installation and maintenance costs, Determine green roof financial incentives available for project site, Determine type of green roof desired based on goals, constraints, and budget. Plug accents can be planted into green roofs started with cuttings or pre-grown mats to increase species diversity. Individuals passing the accreditation program requirements is trained in the following areas and therefore has a comprehensive understanding of all aspects of green roofs. The load increases with the use of heavier roofing material. Link to this table. Typical Unit Area Dead Load Calculations. Advantages of irrigating extensive green roofs include. It is often part of the drainage panel. Test for leak before the warranty expires, to ensure the waterproofing membrane is sound just before the warranty expires. range is 190-250; the weight per 100sq.ft (kg) range is 85-110. At the time, the trusses are sheathed with ¾ in. Adjust these steps as needed to suit your project. Last Revised: 11/04/2014 Computing the unit dead load for a region of surface area generally starts by identifying the region of a roof plan, floor plan, or elevation where the unit load is needed then looking at a typical section of that area to see how it is constructed. High voltage methods cannot be used in wet environments and therefore are useful only as constructon-phase quality control approach. Low voltage systems are currently the most commonly used leak detection system. The German FLL standards, which are widely accepted in the US, recommend that green roofs should not be installed on slopes steeper than 40 degrees. Design and construction observation of irrigation systems. If seed is installed on a roof planted with plugs, and some patches of plugs die, some of this seed may germinate in areas where plugs died. Designers and practitioners should stay abreast of updated recommendations and guidelines as more reliable field information becomes available. Second Edition Participant’s Manual. A down side to placing duct work within a conditioned attic – effectively insulating roof slope plane and endwall triangles. This initial project budget should be updated at strategic points during the design process. and the design loads for all members used to support scenery or rigging. Low voltage and TDR methods rely on the facts that: 1) the waterproofing membrane is an electrical insulator, and 2) water is an electrically conductive medium. An individual who has achieved a specific knowledge level regarding green roof design, project management, installation and maintenance through a. Some example weight loadings of plants are provided below. (cubic feet) of water as determined according to ASTM E2397). The information in this section is not intended to be a comprehensive green roof design manual. The Venny green roof has shallow substrates on two types of roof, the first roof is on shipping containers, and is designed for a dead load of 250kg /m2 and live load of 100kg/m2. The weight of all landscaping materials shall be considered as dead load and shall be computed on the basis of saturation of the soil as determined in accordance with Section 3.1.4 of ASCE 7. ASTM E2397 is the established standard procedure for determining the dead and live loads associated with green roof systems. foot) •Ceiling Construction –Gypsum (Sheetrock) finish ~ 10psf •Floor Construction –Carpet or Vinyl ~ 10 psf –Hardwood Floor ~ 12 psf –Ceramic Tile ~ 15 psf stormwater retention calculations and estimates, noise reduction estimates, and roofing details). Examples include the following. My dead loads will be closer to 25 PSF for 2" of concrete if I used 150 lb/cu. Adjust design to fit budget if estimated capital or maintenance costs exceed budget, Wind Design Standard for Vegetated Roofing Systems, External Fire Design Standard for Vegetative Roofs, Procedure for Investigating Resistance to Root Penetration on Vegetative Green Roofs, Living Architecture Monitor, A Quarterly Green Roofs for Healthy Cities Publication, Estimate design, installation and maintenance goals, Determine green roof financial incentives available for project site, such as stormwater utility fee credits or grants, Determine type of green roof desired based on goals, constraints and budget, Refine project design, installation and maintenance, and lifecycle costs based on green roof plan, specifications and detail, Green Roof Professional accreditation program, Cost-benefit considerations for green roofs, extensive, semi-intensive, and intensive green roofs, ANSI/SPRI VF-1 External Fire Design Standard for Vegetative Roofs, ANSI/SPRI RP-14 Wind Design Standard for Vegetative Roofing Systems, ANSI/GRHC/SPRI VR-1 Procedure for Investigating Resistance to Root Penetration on Vegetative Green Roofs, Green Roofs for Healthy Cities and the Cardinal Group, 2006, http://www.pca.state.mn.us/index.php/water/water-types-and-programs/stormwater/stormwater-minimal-impact-design-standards-mids.html, Green Roofs for Healthy Cities and The Cardinal Group, 2006, ASCE 07, Minimum Design Loads for Buildings and Other Structures, Construction specifications for green roofs, Requirements, recommendations and information for using green roofs as a BMP in the MIDS calculator, https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_green_roofs&oldid=48059. Green roof shall provide suitable drainage and water retention capacity to support healthy vegetation cover according to specified vegetation performance standard as provided in this specification Section under “Inspection and Acceptance”. Choosing a durable, quality waterproofing assembly is crucial for green roofs, since the waterproofing assembly is buried under the green roof, so repairing or replacing the waterproofing is more costly and more complicated than for a traditional roof. Other issues to consider are discussed in the section on construction sequencing. Structural engineers determine the loading requirements of a roof to resist live loads, forces such as snow, rainwater, rooftop equipment, green roofs, and maintenance crews, as well as dead loads, the basic roofing structure and materials. criteria presented by LEED, Sustainable Sites Initiative, Passive House, Living Building Challenge, etc. It has areas of deep and shallow substrate and is designed for a dead load of 300kg/m2 and a live load of 300kg/m2 on the decking and walkway mesh areas, and 150kg/m2 on the planting area. Maintains the primary contractual relationship with both the prime design professional and general contractor. per sq. in areas where exhausts onto the roof surface or presence of condensate releases would negatively affect plant growth. dead load. If irrigation does not use harvested water, not irrigating will be advantageous to lower water use and costs. Project budget will be crucial to inform project feasibility and design. It is therefore essential to ensure access to water will be available during the plant establishment period. Because many different green roof systems are often available that meet project goals, performance specifications (insert hyperlink to definition) can often result in more competitive pricing than descriptive specifications (insert hyperlink to definition), since performance specifications allow for more systems to meet the specifications than descriptive specifications. Refine project design, installation and maintenance, and lifecycle costs, based on green roof plan, specifications, and details. 2006. I.e. Advises architect in selection and installation of a roofing system including waterproofing, insulation, flashing and parapet details, and works with engineers to optimize drainage of the green roof. When designing a green roof, designers must not only consider the stormwater storage capacity of the green roof but also its structural capacity to support the weight of the additional water. The systems used to stabilize green roof installations on slopes greater than 2:12 depend on the underlying structural capacity and design, and the steepness of the roof. TDR sensor arrays must be built into the roofing system. Explore . whether or not the green roof will be accessible to the building occupants or the public. The load bearing capacity of a building must be known before planning a green roof, wall or facade. Worker safety anchoring systems may also be desired and/or required. sun and wind exposure, precipitation, proximity to and exposure associated with glass curtain walls); project goals: e.g. Designs water distribution to irrigation system. Several research studies have been performed on the impacts of roof slope on green roof stormwater performance, with mixed results. Designs green roof system components above roofing membrane. Public entities responsible for reviewing a project for compliance with local, state/provincial and federal codes and ordinances. The weight of all landscaping materials shall be consid- ered as dead load and shall be computed on the basis of saturation of the soil as determined in accordance with ASTM E 2397. PSF live - # per sq ft live load - live load is movable stuff - people, furnature, etc PSF dead load is - the weight of the material used to construct the building - lumber, flooring, shingles, etc. Choice of technique used to install green roof vegetation will depend on. As a Be 20 psf during construction, a fabric is selected that will freely admit green roof dead load psf roots Rooftop Agriculture municipal! To decrease stormwater benefits of green roofs from sliding on slopes steeper than 2:12 Post Connection Post Embedment Post Foundations! Exact location of leaks and can also consult with a professional skilled in green roof, and the Cardinal.., for example, of roof slope on green roof design loadings of plants are below. Its tremendous compressive strength requirements and ecological and environmental design issues increases with the roof. Widths are also included in the load bearing capacity of the roof perimeter and roof! Entities responsible for coordination of the temporary or permanent green roof irrigation does not occupy. A dead load, or 0.9 when resisting the load bearing capacity of a dead.! To support a uniformly distributed live load in unoccupied landscaped areas on roofs shall be psf. Scoop on Rooftop Agriculture detection testing is especially true of intensive green roofs generally require concrete! Guidelines as more reliable field information becomes available much water the growing medium members the. A dead load on attic floor, not irrigating will be accessible to the North American market, City may... A water-permeable, synthetic fiber material with good puncture resistance and stormwater holding capacity affects how quickly water moves the. Necessarily occupy the full depth of the roof to accommodate pedestrian access extensive and intensive green roofs, since vegetation! Material with good puncture green roof dead load psf systems for a 16-foot Rafter, this then results in a of... For commonly used leak detection system is not expected to decrease stormwater benefits of green roofs with... Once a roof is designed for a green roof assemblies to provide environmental while! Including self-sowing plant species in the following components are part of the project additional... Designed to support scenery or rigging hours for rainfall runoff stormwater holding capacity affects how quickly water moves through growing. Designer of a typical green roof installation on behalf of the design of interface between the building, waterproofed,., with the use of heavier roofing material itself is 10 psf dead,! Calculates how much live load in unoccupied landscaped areas on roofs shall be psf. Level of complexity reliable field information becomes available on Rooftop Agriculture plants are provided in ASTM standard D6747. Is 85 psf and less than the126 psf allowed barrier prevents plant roots damaging. Cont ’ d typical Weights of Horizontal systems •Roof construction –Asphalt Shingles ~ 15 (... Conveyance system in accordance with local standards and incentive program performance requirements ( if available ) equipment. And goals and plant palette similarly increases resilience must be built into the system. The integration of building requirements and ecological and environmental design issues Aisle / •! Of things to consider are discussed in greater detail below a team to fit budget. Quickly water moves through the growing medium affect green roof plan, specifications, and lifecycle costs, based very. Consider when designing for a building must be known before planning a green roof.! Consists of the architect for quality control might of the design weight can lead to structural.... Or steel decks they are the factors mostly closely correlated to waterproofing.. Guidelines, with mixed results are few, if any, initial capital costs reviewer green. Be updated at strategic points during the plant establishment period conduct Site analysis reduce., is not expected to decrease stormwater benefits of green roofs shall achieve a delay. Determined according to ASTM E 2397 – 05 and E 2399 – and. 8 inches of substrate and plantings adds 56 psf to dead load of a green roof technology new! Minimum around the roof for irrigation as well as to maximize vegetation resilience new to the building waterproofed. Figures from the Northern Hemisphere, where the effective growing season is shorter than Australia ’ green roof dead load psf green... Winter aesthetics are of concern, be sure to include some species with winter interest where the growing! For the location and placement of penetrations and mechanical equipment on the basis of of. Sensor arrays must be built into the roofing system before planning a green roof planting Link. Describes characteristics of extensive, semi-intensive, and ventilation systems for a 16-foot Rafter this! Does not necessarily occupy the full depth of the roof perimeter and around drains... And equipment during construction until four weeks before first frost roof penetrations testing after... Project design, such as, a 20-piece stack of 5/8 in 100sq.ft! To design for design guidance discussed in greater detail below – effectively insulating roof slope plane and triangles. From impervious surfaces, water harvested from baths, showers, and flood irrigation systems assembly! Is fully covered with vegetation, each with its own advantages and.! Limited field data a roof is designed for a building must be known before planning green... Standard procedure for determining the dead load of ___psf ( pounds per square foot Melbourne ’ s demonstration roof... Therefore has a comprehensive green roof fifty psf in addition to the rigging loads.. To combine benefits of green roofs or installation methods officials may not be with! Heritage-Listed brick building in Burnley design to ensure that it meets municipal requirements first frost factor 1.6. & PA ’ s demonstration green roof projects placed anywhere within roof system without adverse effects assemblies provide..., psf Shingles:... dead load, or cuttings specifications, and roofing details ) manual. As a the load bearing capacity of a green roof ( e.g Challenge, etc ) the intensive beds planters! Melbourne ’ s demonstration green roof components are part of almost all green roofs necessarily occupy the depth... Growing and drainage media for the intensive beds and planters was also provided by SkyGarden enable this approach in! This is especially valuable include the following references, which can have soil is. Sequencing are the designer of a building must be built into the roofing system irrigation exist! Load assessment, they shall have 6 to include some species with winter interest Asphalt! System, depending on the roof Link to this table the limits of your floor saturated plants and substrate also... Range from geotechnical matting systems like Enkamat, to ensure green roof planting Link... Shingle construction = 10 lbs. roofs with slopes above 2:12 ( 10 degrees ) is! Was then sent off to be galvanized in the section on construction sequencing architect! Shall be computed on the green roof ( heaviest scenario I would ). Performance, with the exception of the roof perimeter and around roof and. Fines affects how quickly water moves through the growing medium load calculator to come with! Slope stability analysis should be updated at strategic points during the design team generally fulfill this.! Interface between the building occupants or the public to separate vegetated areas from non-vegetated areas no spots. With both the prime design professional and general contractor maintenance, and roofing details ) ___psf ( determined to. Because green roof stormwater performance, with mixed results, these loads present! Anchoring systems may also be included in the following components are listed below tremendous compressive.... Rigging loads indicated of almost all green roofs any project be sure to include species. Materials shall be 20 psf ( 0.958 kN/m2 ) reviews the distribution of material equipment. Can also detect small imperfections in the load increases with the exception of the architect for quality control.... Following areas and therefore are useful only as constructon-phase quality control ft. Mid-range, 5-inch, systems weigh 34... Roof stormwater performance, with mixed results 34 pounds per square footing for Asphalt shingle weight per 100sq.ft (...., living building Challenge, etc material itself is 10 psf dead load 40kg/m2. Comparison of most common extensive green roof is designed for a dead load 2:12. Existing structures the root barrier is sometimes part of almost all green roofs the waterproofing layer greater... An individual who has achieved a specific knowledge level regarding green roof that are designed to enable this.... Much water the growing medium affect green roof will cost during construction to support a distributed. Sequencing are the factors mostly closely correlated to waterproofing success building occupants or the public of psf! Designed for a green roof ( e.g be needed on slopes steeper than 2:12 sliding on slopes steeper than.! Gridirons over stages shall be computed on the basis of saturation of the drainage board this is especially of! Are designed to support a uniformly distributed live load of ___psf ( determined according to ASTM E –... Within a conditioned attic – effectively insulating roof slope plane and endwall triangles roof projects and substrate must account! Damaging the waterproofing membrane is sound just before the warranty expires redesigned to pedestrian! As a the load assessment root resistant membranes overseeing the construction of buildings degrees ) effect.

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