Spec 07_72_73 - Revised 23 April 2009.pdf

102-029 07 72 73-1

SECTION 07 72 73 1

MODULAR GREEN ROOF SYSTEM 2

A. GENERAL 4

RELATED WORK SPECIFIED ELSEWHERE 6

Membrane Roofing System (TPO) Section 07 54 23 8

SCOPE 10

Furnish all labor, materials, tools, and equipment necessary for the complete modular green roof system (MGRS) 12 as described herein and shown on the Drawings, including growing modules, custom shaping of growing modules, 13 module edge treatment, growth media, vegetation, and temporary irrigation system, along with work specified to 14 be performed during the maintenance period. 15

DESCRIPTION OF SYSTEM 17

Modular green roof system (MGRS) shall be one of the following (or approved equal), providing that the materials 19 meet the requirements under Part B, Products below: 20 Green Grid System by ABC Supply Company, Inc. (www.greengridroofs.com) 21 Live Roof Standard by Live Roof, LLC (www.liveroof.com) 22

QUALITY ASSURANCE 24

Installers shall be factory trained and qualified personnel, licensed by the MGRS manufacturer. Installers shall be 26 craftsmen trained, knowledgeable and experienced in the actual application of this specified MGRS system. 27 MGRS subcontractor shall be a firm with a minimum of two years experience in the application of the type of 29 MGRS system shown and specified. All MGRS system work and associated work shall be subcontracted to a 30 single firm which shall have undivided responsibility for the specified performance of component parts as follows 31 (even though some components may be subcontracted to others): 32 Growing modules 33 Growth media 34 Vegetation 35 Temporary irrigation system 36 Required maintenance during specified maintenance period 37 MGRS installer shall maintain a full-time supervisor/foreman on the jobsite during times that MGRS work and 39 associated work is in progress. Supervisor shall have a minimum of two years experience in MGRS work similar 40 to the nature and scope of the specified MGRS system. 41 Upon completion of the installation, an inspection shall be conducted by the MGRS Manufacturer’s Representative 43 to ascertain that the growing modules have been installed according to these specifications and details. 44

WARRANTY 46

Growing Modules: Manufacturer shall warrant that each growing module will perform its function of containing 48 plant growth media for a period of twenty (20) years from the date of acceptance by the Government. 49 Vegetation: Submit shall supply replacement plant(s) free of charge for any plant found to be dead or in severe 51 decline (beyond the point of returning to aesthetic and economic value) for a period of 30 days from the date of 52 acceptance by the Government. 53

SUBMITTALS 55

Submit product data for all MGRS materials, including growing modules, module edge treatment, growth media, 57 vegetation and temporary irrigation system in accordance with Section 1B, Shop Drawings/Submittals. 58 Submit information on total weight of system per square foot, including growing modules, growth media and 59

102-029 07 72 73-2 vegetation. 1 Submit Shop Drawings in accordance with Section 1B, Shop Drawings/Submittals. Shop Drawings shall show in 3 detail the anticipated method for the placement and application of the MGRS and associated materials. 4 Submit an installation plan including but not limited to: system delivery and maintenance plan during required 6 maintenance period. 7 Provide instructions for vegetation maintenance to be performed by the Government after the completion of the 9 maintenance period required under this Section. 10 Provide instructions for Government personnel to empty and blow down temporary irrigation system during fall 12 season. 13

PRODUCT DELIVERY, STORAGE, AND HANDLING 15

Materials shall be delivered in their original, unopened containers or with protective coverings clearly labeled with 17 manufacturer’s name, name brand, and appropriate identification numbers. All flammable materials shall be 18 stored in a cool, dry area away from sparks and open flames. Follow precautions outlined on containers or 19 supplied by material manufacturer/supplier. Materials damaged in handling or storage shall not be used and shall 20 immediately be removed from the site. 21 Store all materials to prevent them from becoming wet, soiled, or covered with ice or snow before, during, or after 23 delivery to site. Store material in a completely enclosed building or trailer, if possible. If necessary to store 24 outdoors, stack materials on platforms or pallets at least 4 inches above ground and cover with waterproof canvas. 25 Allow air circulation under canvas so condensation does not occur; do not extend canvas to ground. 26 All new and temporary construction, including equipment and accessories, shall be secured in such a manner as 28 to preclude wind blow-off and subsequent roof or equipment damage. 29

JOB CONDITIONS 31

Proceed with application of MGRS system and associated work only when existing and forecast weather 33 conditions and temperature meet the recommendations of the MGRS manufacturer. 34 Protect other work from spillage of MGRS system materials and prevent all materials from entering or clogging 36 drains or connecting piping. Replace and restore other work which has been soiled or otherwise damaged by 37 application of MGRS. 38 Protect completed work where damage may be caused by other trades working on the roof. 40

B. PRODUCTS 42

Growing modules shall be formed of minimum 100 mil thick 100% post industrial recycled high molecular weight 44 polyethylene or polypropylene protected with UV inhibitor and stabilizers. Growing module size shall be 45 approximately 2’-0” x 4’-0” x 4” deep. Modules shall include drainage holes at lowest points. Color shall be black. 46 Module edging shall be L-shaped extruded aluminum extrusions minimum 200 mil thick with performations for 48 drainage. Module edging shall match or exceed height of growing modules. Provide aluminum connectors to 49 maintain alignment between different sections. Attach edging to growing modules with 1” wafer head self-tapping 50 screws. 51 Growth media shall be an engineered lightweight blend consisting of inorganic and organic components suitable to 53 support vegetation. 54 Vegetation shall be plant mixes including deciduous, evergreen and semievergreen plants, along with water 55 conserver plants such as Sedums, Alliums and other species that can thrive in an irrigated rooftop environment in 56 the project location and with the site-specific characteristics (medium-shady, protected environment). Plants shall 57 be selected according to their USDA hardiness zone classification. Vegetation shall be planted in the growing 58 modules at a rate of 8-12 inches on center (8 to 11 plants per 2x4 module) several months in advance of 59

102-029 07 72 73-3 installation at the project site and shall have been grown in a greenhouse-type environment to a point where they 1 cover 70% - 80% of the surface area of the growing modules. 2 Total weight of installed system, including growing modules, growth media (fully saturated) and vegetation shall be 4 25 psf maximum. 5 Temporary irrigation system shall be surface-applied SCH 40 polyvinyl chloride plastic pipe for irrigation lines, with 7 SCH 80 solvent weld PVC fittings and with spray irrigation heads 8 Consult a qualified irrigation specialist to determine appropriate design configuration of irrigation, including pipe 10 diameter, layout, head style and spacing. Irrigation system shall have the following features: 11 A. Function: Full automatic. 13 B. Controls: 14

1. Automatic rain sensor. 15

2. Irrigation controller shall be outdoor-type. 16

3. All sprinklers shall have matched precipitation on the same zone. 17

C. Valves: 18

1. A master valve shall be installed on the mainline after the backflow device. 19

2. All wire connections shall be waterproof, UL approved. 20

3. Install automatic freeze protection drain valves on all main and lateral piping. 21

C. EXECUTION 23

INSTALLATION 25

Comply with the manufacturer's written instructions and recommendations. 27

PREPARATION 29

Restrict traffic from work areas until growing modules are installed and thereafter to restrict damage to the plant 31 material. 32 Thoroughly sweep away all debris, foreign material, etc. from the roof surface prior to installation of growing 34 modules. 35 During installation of MGRS, protect the roof membrane with appropriate material such as plywood sheeting. Do 37 not scrape or puncture slip sheet or membranes. 38

APPLICATION OF GROWING MODULES 40

Remove all debris from the slip-sheet surface that might interfere with installation of the growing modules or 42 compromising the integrity of the roof surface. 43 Place growing modules over the slip-sheet in the desired locations as shown on the Drawings. 45 Growing modules shall be installed in straight rows, tight against each other with edges overlapping, and arranged 47 in the proper directional orientation. 48 Installed growing modules shall be watered sufficiently with a fine spray so as to thoroughly moisten the growth 50 media from top to bottom. 51

MAINTENANCE PERIOD 55

MGRS subcontractor shall maintain the MGRS for a period of at least 90 days after completion prior to acceptance 57 by the Government. 58

102-029 07 72 73-4

90-Day maintenance shall include: 1

- Water the MGRS once a week (weather dependent) to aid in plant establishment. System shall be 2 watered more frequently during extended hot and dry weather especially when plants are showing signs 3 of wilting. 4

- Perform spot weeding as necessary. 5

- Repair, rework, and replant all areas that have washed out or are eroded. Replace undesirable or dead 6 areas with new plants. 7

- Apply suitable bio-controls, fungicides, or insecticides only as required to control diseases and insects. 8

Comply with all applicable local, State and Federal regulations and label instructions when applying these 9 materials. 10

Upon completion of the 90-day maintenance period, a written maintenance plan for the specific green roof system 12 shall be submitted to the Government Construction Representative. 13

ACCEPTANCE 15

Inspection to determine acceptance of MGRS will be made by the Government, upon Contractor’s request. 17 Acceptance of MGRS will be based on a review that all requirements, including maintenance period, have been 19 complied with, and healthy, even-colored, viable plants have been established. 20