the green roof system and any needed structural reinforcement. Getter et al. Snodgrass, E.C., and L.L. The ideal window for planting green roofs in Minnesota is from after last frost until four weeks before first frost. 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. An independent roofing professional who provides information pertaining to the roof membrane, waterproofing, and determines what system would be best suited to the roof. Planting Green Roofs and Living Walls. Assumed 80 mph. Evaluates suitability of existing waterproofing for green roof. 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. Ensuring that installation is carried out in accordance with local standards and incentive program performance requirements (if available). Examples include stormwater utility fee credits or grants. stormwater retention calculations and estimates, noise reduction estimates, and roofing details). specific stormwater management, such as reducing pollutant load or volume and rate control; specific uses, such as food production, gathering spaces; minimizing building energy usage for heating and cooling; marketing and branding as part of an overall green building strategy; and. An individual or company (i.e. Monitors construction compliance with plans and specifications. dead load. (FLL) Richlinien für die Planung, Ausführung and Plege von Dachbegrünung (Guideline for the Planning, Construction and Maintenance of Green Roof –Green Roofing Guideline: developed by the German Research Society for Landscape Development and Landscape Design), latest English Edition. In most assemblies, a fabric is selected that will freely admit plant roots. Check when there is evidence of a leak that needs to be located. Reviews plans for material transportation to roof. Because of the dead load restrictions applicable to the majority of this retrofit green roof, the extensive green roof media was designed to be extra-lightweight. Readers can also consult with a professional skilled in green roof design for design guidance. list of required submittals and when the submittals are due, including submittals related to materials as well as contractor qualifications; list of green roof performance requirements; materials specifications for all green roof related components. Green roof shall have a Rational runoff coefficient of "x", for storms with durations of X hours and return frequency of X years. Permeability affects how quickly water moves through the growing medium. My dead loads will be closer to 25 PSF for 2" of concrete if I used 150 lb/cu. 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. Note: these are figures from the Northern Hemisphere, where the effective growing season is shorter than Australia’s. - The second trussed roof is designed for a dead load of 160kg/m2 and a live load of 40kg/m2. 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. Structural engineers use the solar panel roof load calculator to come up with the correct load capacity of the roof material. 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). (cubic feet) of water as determined according to ASTM E2397). Assumes primary liability for the design and structural integrity of the project. Their participation in the design process can help to ensure green roof installation. Ballast Pavers • Standard Ballast Thickness: 1 13/16 • Weight: 23 lbs/sf • Range of Standard Ballast Paver sizes available Minimum system dead load of ___psf (pounds per square foot) (determined according to. (cubic feet) of water as determined according to ASTM E2397). 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. Two examples from the literature are summarized below. foot) •Ceiling Construction –Gypsum (Sheetrock) finish ~ 10psf •Floor Construction –Carpet or Vinyl ~ 10 psf –Hardwood Floor ~ 12 psf –Ceramic Tile ~ 15 psf ft. In this case, your joists are adequate to support a 30 psf live load and 10 psf dead load. 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. 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. Electrical engineers deal with electrical power transmission. Variations from the design weight can lead to structural failure. Load on 12/12 pitch roof. Drainage capacity must also account for vertical sheet flow from adjacent facades or tall parapets. Green Roofs for Healthy Cities and The Cardinal Group. Curbs or borders are also sometimes used to provide a firebreak or protection from wind uplift (Green Roofs for Healthy Cities and The Cardinal Group, 2006). The weight of the landscaping materials shall be considered as dead load and shall be computed on the basis of saturation of the soil. 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. Acts as Project Manager responsible for coordination of the design team. Advantages of not irrigating extensive green roofs include the following. The extensive green roof assembly weighs 17 psf when fully saturated. Determines occupancy requirement for fire codes. (Usually 20 lbs. One important item to design for is an increased structural load. whether or not the green roof will be accessible to the building occupants or the public. It is built on a heritage-listed brick building in Burnley. May conduct site analysis to reduce or eliminate internal drains. While some studies found no significant correlation between green roof slope and stormwater runoff (Bengtsson 2005; Mentens et al 2006), others found greater stormwater retention at lower roof slopes (e.g. design live load in unoccupied landscaped areas on roofs shall be 20 psf (0.958 kN/m2). 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. Gable • Raised Center Aisle / Monitor • … Potential irrigation water sources include: While almost all green roofs will need water during the plant establishment period, extensive green roofs can be designed without permanent irrigation. 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. Water holding capacity affects how much water the growing medium can hold. It is often part of the drainage panel. While not all extensive green roofs require permanent irrigation, almost all green roofs require irrigation during the establishment period (unless adequate rainfall occurs), often several times a day. Choice of technique used to install green roof vegetation will depend on. I.e. Currently available guidelines, with the exception of the FLL Green Roofing Guideline, are based on very limited field data. Provides electricity needed on the green roof for irrigation as well as anything else that required electricity on the roof. Factors That Influence . Maintains the primary contractual relationship with both the prime design professional and general contractor. range is 190-250; the weight per 100sq.ft (kg) range is 85-110. See, for example, Berndtsson (2010) for an overview of slope impact on stormwater performance of green roofs. The University of Melbourne’s demonstration green roof is designed for use by visitors and staff. Drawings for drainage and water inside the building. 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. Each of these is discussed in greater detail below. ASTM E2397 is the established standard procedure for determining the dead and live loads associated with green roof systems. 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. Low voltage systems are currently the most commonly used leak detection system. © 2020 by Minnesota Pollution Control Agency The dead load of a green roof assembly should be determined on a project-specific basis, because growth medium composition varies from job to job. reduce fire risk associated with air intakes or proximity to flammable materials and equipment; provide access for roof maintenance related issues; provide enhanced flow path toward drains out scuppers for runoff sheeting off walls and parapets; and. 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. In addition to the information provided on this page, we recommend the following references, which address green roof design. Explore . Here, each square foot of roof system delivers 50 pounds of live load and 15 pounds of dead load (65 psf total) to the structural support system. This section provides a discussion of issues to consider in green roof design. “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. Paper work associated with the green roof (e.g. Green roofs shall achieve a peak-to-peak delay of "x" hours for rainfall runoff. Some example weight loadings of plants are provided below. 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”. Reinforced concrete creates the heaviest dead loads but also supports the most weight with its tremendous compressive strength. Review of proposed design to ensure that it meets municipal requirements. They are the designer of a scheme or plan. 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. Therefore, a typical roof with 24-inch rafter spacing and rafters that weight 2 PLF would have a dead load of 10 x (24/12) + 2 = 22 PLF before the solar equipment was added. 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. sun and wind exposure, precipitation, proximity to and exposure associated with glass curtain walls); project goals: e.g. Under the roof ballast or pavers, the assembly is typically the same as for the green roof. Refine project design, installation and maintenance, and lifecycle costs, based on green roof plan, specifications, and details. A typical value for the roofing material itself is 10 PSF. Source: Jakob Rope Systems. Vegetated roofs shall retain a minimum of "x" c.f. 2007; Van Woert et al., 2005). • Floor live load = 40 psf • Floor dead load = 20 psf During construction, a 20-piece stack of 5/8 in. The root barrier is sometimes part of the drainage board. Designed by Gimmeblogs Link to this table. 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. Typically a water holding fabric or a plastic sheet with cup-like depressions, the water retention layer holds water for later use by plants. Poor design can lead to structural failure of a green roof. 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. Where uniform roof live loads are reduced to less than 20 psf (0.96 kN/m2) in accordance with Section 1607.12.2.1 and are applied to the design of structural members arranged so as to create continulty, the reduced roof live load shall be applied to adjacent spans or to alternate spans, whichever produces The owner is the ultimate authority on any project. Cantor, S. L. 2008. Unlike the low voltage method, however, these systems can provide real-time on-demand information about the waterproofing status and alarm owners if a problem is detected. 5. Several types of leak detection systems are available, including high and low voltage surface surveys and built-in time-domain reflectometer (TDR) sensors. ft. portland cement with no gypsum or fillers (heaviest scenario I would envision). An engineered slope stability analysis should be performed for green roofs with slopes above 2:12 (10 degrees). 1.2D + 1.0E + L + 0.2S When H loads are present, they shall have 6. 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. 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. 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. The information in this section is not intended to be a comprehensive green roof design manual. by 4'x 12' gypsum board is stored near the mid-span of two of the trusses with the long dimension parallel to the trusses. Worker safety anchoring systems may also be desired and/or required. DEAR ROB: 10 psf dead load is primarily to cover weight of ceiling gypsum wallboard. The might of the dead load, or lack thereof, often defines how much live load it can handle. 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. It is therefore essential to ensure access to water will be available during the plant establishment period. Drainage components typically include the following. Reviews green roof plans to increase available loading. climate and microclimate (sun and wind exposure, precipitation, proximity to and reflection from glass curtain walls); type and condition of existing waterproofing, deck, and parapet if retrofit; building HVAC systems, including nature of intakes and exhausts onto the roof surface and presence of ondensate releases; potential impacts on vegetation; impact on potential building heating and cooling energy savings; water storage and supply (spigot and tap availability); opportunities for rainwater harvesting and storage; source of power if needed for irrigation or installation; elevations of existing or planned parapets, door thresholds, sills of curtain walls; building code and insurance requirements; and. AF&PA’s Appendix A lists a variety of live and dead load combinations for floors, ceilings and rafters. Several research studies have been performed on the impacts of roof slope on green roof stormwater performance, with mixed results. Performance specifications also allow for the most innovation. An architect is a person licensed in the art of planning, designing and overseeing the construction of buildings. Green Roofs in Sustainable Landscape Design. While a simple manual overhead system is less expensive, drip systems are typically more water efficient than overhead systems and provide more uniform coverage. runoff harvested from impervious surfaces, water harvested from air conditioning effluent, grey water harvested from baths, showers, and sinks. No publication year given. Efficient irrigation is not expected to decrease stormwater benefits of green roofs, since lusher vegetation and moister soils provide greater evapotranspiration. Other key elements of green roof specifications typically include, but are not limited to the following: This page was last edited on 13 April 2020, at 12:40. Timber Press, Portland OR. per sq. 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. 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. For smaller projects, other members of the design team generally fulfill this role. 2004. The weight of saturated plants and substrate must also be included in the load assessment. Project budget will be crucial to inform project feasibility and design. Specialists retained to design irrigation. building owners, developers, consortiums, or government entities) that requests the service of professionals to create a green roof / green building. Section 3.2. Wind or surface runoff erosion protection, Amenities: for example, walkways, gathering areas, site furniture, water features, lighting, interpretive materials, other structural elements such as trellises and arbors. Design and construction observation of irrigation systems. Dunnett, N., and N. Kingsbury. Determines potential areas of roof penetration. • 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. The dead load of a typical asphalt-shingled, wood-framed roof is about 15 pounds per square foot. ANSI/SPRI RP-14 Wind Design Standard for Vegetative Roofing Systems provides guidance for minimizing risk of wind uplift on green roofs, including recommendations for location and width of vegetation free zones in areas of the roof particularly vulnerable to wind uplift and scour. criteria presented by LEED, Sustainable Sites Initiative, Passive House, Living Building Challenge, etc. This protection layer is a water-permeable, synthetic fiber material with good puncture resistance. Descriptions of these techniques are provided in ASTM Standard Methods D6747 and D7007. in areas where exhausts onto the roof surface or presence of condensate releases would negatively affect plant growth. Other issues to consider are discussed in the section on construction sequencing. Common materials used for root barriers include PVC, TPO, and polyethylene. 1607.11.2.3 Green Roofs Where roofs utilize a green roof system and are not intended for human occupancy, the uniform design live load in the area covered by the green roof shall be 20 psf (0.958 kN/m 2). Milestones when leak detection testing is especially valuable include the following. No potential phytotoxicity shall be introduced through any of the temporary or permanent green roof materials or installation methods. Weight loadings are therefore likely to be an underestimate. Mid-range, 5-inch, systems weigh approximately 34 pounds per square foot and are compatible with wood or steel decks. Designs water distribution to irrigation system. The Importance of preserving an option for post-construction leak surveys will, however, influence the green roof design. The main goals of this article are therefore to provide a detailed list of design considerations and examples of issues to consider when designing a green roof, as well as factors that will affect stormwater treatment performance. 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. ft. Live load on attic floor = local requirements. Once a roof is fully covered with vegetation, the vegetation typically protects soil from erosion. 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. Link to this table. Test integrity of the membrane once installation of the waterproofing membrane is complete before installing the growing medium, so any leaks or imperfections can be fixed before the growing medium and vegetation are installed, After installation of the vegetation, and all other construction traffic on the green roof is complete, ensure no leaks were caused during any of the construction phases after the first leak test (Note: Applies to green roofs without root-barriers). For example: Leak testing, while a prudent precaution and check, is not a substitute for craftsmanlike installation of the waterproofing layer. Responsible for the design of interface between the building, waterproofed roof, and the green roof (degree of systems integration). For a 16-foot rafter, this then results in a 352 lbs. Consequently, Sedum-based extensive profiles may qualify as ‘fire breaks’ on otherwise intensive green roof projects. Provides technical information on the cost of construction (market prices, labor, materials, transportation, etc). This initial project budget should be updated at strategic points during the design process. The growing and drainage media for the intensive beds and planters was also provided by SkyGarden. 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. Inspects roof installation on behalf of the architect for quality control. Green Roof Infrastructure: Design and Installation 201. Soil moisture sensors can be used to program irrigation to only be activated when soil is dry and plants need water 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. Inherits the completed project and on-going maintenance responsibilities. §[C26-902.6] 27-561 Roof loads. Percent fines affects how quickly water moves through the growing medium. These steps are explained in greater detail below. Individuals passing the accreditation program requirements is trained in the following areas and therefore has a comprehensive understanding of all aspects of green roofs. Depending on the project, additional roles not shown in the table may be needed. Structural steel offers much less of a dead load and provides superior support for live loads in multi-story buildings. A variety of controllers and sensors are available that can be used to maximize water efficiency and stormwater holding capacity. Evaluate factors that affect roofing design, such as. The load increases with the use of heavier roofing material. So analyzing the loading along one beam support a three-foot width of decking found 498 pounds per linear foot dead load and 348 pounds per linear foot live load totaling 446 pounds per linear foot. Kits for All Purpose Buildings. Water retention layers are available in a range of water holding capacities, typically between 0.06 gal/ft2 and 0.16 gal/ft2. was redesigned to accommodate the additional dead loads associated with the green roof. The second most common conservative assumption found in the industry is to assume that the green roof is a soil load rather than a dead load. Dead Loads, cont’d Typical Weights of Horizontal Systems •Roof Construction –Asphalt Shingles ~ 15 psf (pounds per sq. The following table shows some of the pros and cons of some potential green roof vegetation installation techniques. 2006. For an excellent Green roofs with a diverse plant palette are usually more resilient than those with very few species and also generally provide greater stormwater and other ecological benefits. Inadequate drainage can result, for example, in structural loading problems, major damage to the building, as well as problems with plant health. controllers are available that time irrigation based on weather forecast and predicted evaporation rates, e.g. ft.) that have a waterproofing layer anchored with stone ballast. Intensive green roofs almost always need a permanent irrigation system, depending on factors such as project goals and plant palette. In most cases, fully-saturated extensive green roofs have a maximum load of about KH psf, which is fairly similar to traditional new rooftops (IJ to IM lbs./sq. In some instances, it is possible to strengthen an existing roof in strategic areas (and not across the whole roof) in order to achieve the design outcome while also minimising costs. Plants exposed to seasonal moisture variations may be more resilient. Heavier intensive green roofs generally require a concrete supporting deck. 3.3 Dead Loads Dead loads consist of the permanent construction material loads comprising the roof, floor, wall, and foundation systems, including claddings, finishes, and fixed equipment. 18 Gage N-Deck is 85 psf and less than the126 psf allowed a wall can from... Weigh approximately 34 pounds per square footing for Asphalt shingle weight per square foot ) ( according! Help to ensure green roof season is shorter than Australia ’ s a... 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To water will be accessible to the building occupants or the public periodically check the roof perimeter and roof... Common materials used for storage only ) dead load combinations for floors - depends - deck floor attic! Typical Weights of Horizontal systems •Roof construction –Asphalt Shingles ~ 15 psf ( 0.958 kN/m2 ) gypsum fillers. Demonstration green roof planting methods Link to this table there is evidence of a typical for... Such as, review of proposed design to ensure that it meets municipal.! Usually needed immediately after installing plugs, seeds, or 0.9 when resisting the load bearing capacity the. Increased to 100 psf on all portions of the project in addition to the information in this section a... Local requirements for correction of any leaks prior to installing the green roof stormwater. Then results in a 352 lbs. requirements and ecological and environmental issues. Anything else that required electricity on the basis of saturation of the roof perimeter and around drains... Window for planting green roofs for Healthy Cities and the Cardinal Group, 2006 ) was then sent off be... Also be included in the art of planning, designing and management the. Impossible in most instances, cable grids, and mechanically attached structural grids interface between the occupants! Structural reinforcement the basis of saturation of the FLL green roofing Guideline otherwise... And overseeing the construction of buildings following areas and therefore has a comprehensive green roof will be closer 25. The North American market, City officials may not be familiar with the use of heavier roofing.! Wall is designed for a building must be known before planning a green will... Mandel, L., 2013, EAT up ; the weight per 100sq.ft ( lbs. is. Load it can handle heritage-listed brick building in Burnley that it meets municipal.... A determined maintenance period 2399 – 05 ) 5/8 in E2397 ) are distributed over! Cost estimator calculates how much live load of 40kg/m2 species diversity green roof dead load psf, etc ) per sq excellent 's! Load 7 building occupants or the public maximize water efficiency and stormwater holding capacity the drainage board used leak systems., not floored = 10 lbs. as for the intensive beds and planters was also provided SkyGarden... No potential phytotoxicity shall be considered as dead load = 20 psf ( pounds per footing. Exposure associated with glass curtain walls ) ; project goals: e.g green is... Knowledge level regarding green roof consists of the FLL green roofing Guideline design. Raised Center Aisle / Monitor • … section 3.2 performance of green roof design and construction capacity also! Of planning, designing and overseeing the construction of buildings prices, labor materials! Af & PA ’ s additional structural support is financially feasible if needed ; and gypsum or fillers ( scenario. A substitute for craftsmanlike installation of the roof material a prudent precaution and check, is not expected decrease... Review of proposed design to ensure the waterproofing layer specialized reinforcement is needed to protect roofs. When used for root barriers include PVC, TPO, and lifecycle costs, based on very limited data! Of 40kg/m2 within a conditioned attic – effectively insulating roof slope plane and endwall triangles incorporate root-barriers very. The limits of your floor for later use by visitors and staff to an! Very light drainage and insulation layers load, cable grids, and irrigation... The root barrier prevents plant roots provides technical information on the cost of and! Of 1.6 when adding to load 7 are often included to separate vegetated areas non-vegetated... Relatively light duct could be placed anywhere within roof system and any needed structural reinforcement with good resistance. 1.6 when adding to load 7 to ensure that it meets municipal requirements ventilation systems for a load... To install green roof installation on behalf of the pros and cons of some potential green roof ( of! Projects, other members of the drainage board – effectively insulating roof slope plane and endwall triangles Raised Aisle! State/Provincial and federal codes and ordinances optional green roof installation on behalf of the design process feet ) of as. The public psf ( 0.958 kN/m 2 ) natural environment a 20-piece stack of 5/8.. Group, 2006 ) and exposure associated with green roof design 56 psf to dead load of 80kg/m2 process help!