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Green Roof Toolkit

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Green Roof Toolkit GREEN ROOF TOOLKIT GREEN ROOF OVERVIEW There are three types of green roofs: extensive, semi-intensive and intensive. Although the design will differ, the basic layers remain the same. Green Roof Types Green Roof Composition Extensive A green roof is not simply plants placed on 3 - 4” of growing medium a rooftop, but rather a highly-engineered, 15 - 30 pounds per square foot (additional roof contiguous system of plantings designed to load) protect the structural integrity of the building while less variety of plants | usually Sedum providing significant environmental, economic requires little irrigation| drought resistant and aesthetic benefits. low maintenance costs about $10.00 to $30.00 per square foot No one green roof system fits all. While every (above the cost of a conventional roof) green roof has the same components and few design elements minimum requirements, manufacturers can vary greatly. Semi - intensive 4 - 8” of growing medium 25 - 50 pounds per square foot (additional roof Green Roof cross section load) more plant variety | wildflowers, drought-tolerant plants | sedum & herbs herbacious perennials requires periodic irrigation jute erosion fabric (optional) periodic maintenance growing medium costs about $20.00 - $40.00 per square foot soil retention curbing (above the cost of a conventional roof) incorporates design elements drainage | root barrier geotextile filter fabric insulation (optional) Intensive leak detection (optional) 8 - 12” of growing medium waterproof membrane 40 - 150+ pounds per square foot (additional roof roof deck load) high variety of plants | includes shrubs and trees information from requires consistant irrigation (summer months) www.dcgreenworks.org regular maintenance costs about $40.00 + per square foot (above the cost of a conventional roof) highly designed usable green space GREEN ROOF TOOLKIT GREEN ROOF BENEFITS Green roofs are a highly sustainable roofing technology, providing numerous economic, environmental and social benefits. ECONOMIC ENVIRONMENTAL SOCIAL Reduce the life cycle cost of the Reduce the urban heat island Education opportunities| Green roof| Green roofs may last 3 times effect| On a hot day, an urban roofs provide areas for instruction as long as a conventional roof. area can be 10 degrees (F) hotter in ecology, science and math. than the surrounding area, green Reduce waste and decrease roofs stay 40-50 degrees (F) cooler Provide space for food the need for land-fill expansion than conventional roofs reducing production| Green roofs create The extended life of green roofs the ambient air temperature. opportunities for urban agriculture reduces construction waste and and help increase food security in cost. Reduce stormwater runoff| In urban areas. the summer, green roofs retain 70- Increase property values| As 100% and in the winter they retain Provide aesthetic appeal| The an added amenity, green roofs 40-50% of stormwater, reducing the vegetitation and natural beauty attract higher rents and maintain volume and velocity and reducing of green roofs provide respite from higher tenant retention. erosion and sedimentation of our the concrete hard-scape of urban water sources. areas. Save on energy costs|Green roofs may reduce energy costs 10- Improve water quality| Through Creates usable green space 20% by keeping the floor directly filtration, green roofs prevent Green roofs may provide green below 3-4 degrees (F) cooler and nitrogen, phosphorus, and toxins space throughout urban ares from entering streams and reducing need for expansive HVAC where open space is limited. systems. waterways. Create jobs and economic Improve air quality| Green roofs Provide sound insulation| 4” of security| The establishment of ilter airbourne particles such as substrate reduces noise pollution a green roofing industry creates smog, sulpher dioxide and carbon by 40 decibels adding to the new jobs in manufacturing, dioxide through vegetation desirability of the building. construction, design, installation, foliage. maintenance and horticulture. Decrease need for stormwater Create wildlife habitat| Green infrastructure expansion|Green roofs provide urban green roofs provide on-site retention, infrastructure for native species Visit www.dcgreenworks.org saving vital public resources repatriation and maintaining for more information. species Cedits for stormwater impact biodiversity. fees| Green roofs provide possible credits for stormwater impact fees, saving money on regulatory fees. GREEN ROOF TOOLKIT ARE YOU GREEN ROOF READY? All buildings are NOT green roof compatible. If your building meets the following criteria, you are green roof ready! New Construction Green roof retrofits to commercial and By incorporating a green roof into the original multi-family residential buildings design of new construction and additions you Are you planning to replace your roof or will save time and money. Ensuring that the waterproofing membrane within the next year? roof is built to hold at least 30 pounds per square foot for the added weight of the green roof, Is your rooftop relatively flat with no more than 30 incorporating safe and legal roof access into the degrees of pitch? design and ensuring there are suffiicient funds will faciliate the installation. Do you have an IRMA or ballasted roof systemc Retrofits to small buildings and single currently? family residential If not, does your roof have public roof Are you planning to replace your roof or access, a roof veranda or deck? waterproofing membrane within the next year? If not, can the building support 25 pounds Does your building have LEGAL roof access or a per square foot, beyond snow and wind roof veranda or deck? loading? If you do not have a roof deck, was your Is your rooftop sunny with reatively few or no trees building built after 1960? growing above? If your building was built before 1960 and Can you afford to spend approximately $8-15 doesn’t have a roof deck, have you had per square foot, in addition to replacing your structural reinforcing or new roof joists roof with a specialized waterproofing membrane installed in the last 10 years? approximately $7-15 per square foot? Is your rooftop sunny with relatively few or no trees growing above? Can you afford to spend $10-30 per square foot, in addition to replacing your roof with a specialized Information found on DC Greenworks Website: waterproofing membrane, approximately $7-12 www.dcgreenworks.org per square foot? If the answers to the questions above are “NO”, green roofing may not be right for your building or might not be feasible at this time. GREEN ROOF TOOLKIT WATERPROOF MEMBRANE Green roofs are defined as the vegetation and additional layers above the waterproof membrane. However, choosing the right waterproof membrane is important to the proper function of the green roof. Waterproof Membranes and Green roofs Is your membrane ready for green roofing? Installing a green roof over a waterproof membrane will significantly extend the life of the In addition to ensuring the compatibility of the membrane and the life cycle cost of the roof. waterproof membrane, the age of the membrane at the time of green roofing is important. A green There are several factors to consider when roof should not be installed on a membrane choosing a waterproof membrane to be more than a couple of years old and in good used in conjunction with a green roof beyond condition. waterproofing such as durability, environmental friendliness, tensile strength and root resistance. For a membrane that is a couple of years old, To be used in conjunction with a green roof, the check throroughly for leaks prior to green roof waterproof membrane should be made of an installation. inert material that cannot be penetrated by roots or an additional root barrier must be installed with Flood testing prior to installation may be used to the green roof. Waterproof membranes that are discover any breaches in the membrane. This commonly used in conjunction with green roofs method is used on flat roofs and requires water to are: be pooled on the roof for 24 hours to see if there are any punctures in the membrane which could PVC (45-90 single-ply) lead to leaks in the future. TPO (Thermoplastic Polyolefin single-ply) EFVM (electronic field vector monitoring) technology may be utilized after a green roof is EPDM (Ethylene Propylene Diene Monomer installed to detect any breaches in the membrane single ply) which might lead to leaking. This technology works on both flat and sloped roofs and reduces built-up hot applied high-polymer asphalt the possibility of overlaoding the roof. 2 layers of high polymer SBS modified bitumen A Leak Detection Layer may also be installed with root barrier with the green roof to further ensure leaks are detected and located imediately. Based on widespread installations and a reliable service record, modified bituman and PVC membranes are the best for use in conjunction with a green roof. GREEN ROOF TOOLKIT GREEN ROOF PERMIT PROCESS All green roof projects require a building permit. Permits are obtained through the Department of Consumer and Regulatory Affairs (DCRA). Pre-Application and Application Permit issuance Find out the property’s zoning district Timeline (DCRA’s goal to review) Are you in a zoning overlay district? (zoning 1 - 999 SQ FT | within 24 hours overlay districts have additional requirements 1000 - 2999 SQ FT | within 14 days and restrictions that must be met to receive a 3000 + SQ FT | within 30 days permit.) Visit the DC Office of Zoning website for a complete list of overlay zones. Permit Fees: There are different fees for new construction Obtain a plat or additions, alterations or repairs to existing A plat is a scaled drawing of a lot, showing lot construction. There are also reduced permit fees lines and record dimensions. for green building, such as green roofs. You wil need the Square, Suffix and Lot (SSL) number for each property. Please view link below to determine the cost of Cost of a regular plat is $30.00.
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