Cash Acme offers an extensive range of temperature and pressure relief valves, with models that are perfect for home, business or industrial applications.

T&Pvalvereplacement

INSTALLATION PROCEDURE: The following illustrations describe the basic installation procedure. We often customize the procedure for each roof.

8. Insert green roof plants in a random pattern, two per square foot. Water thoroughly after installation, and during extended dry periods for the first two years. Broadcast Optigreen Slow Release Fertilizer yearly on extensive roofs.

1. If the primary roof waterproofing is not root resistant, first apply a root barrier membrane. Then unroll a protection mat with water-storage capacity, overlapping adjacent sheets at least six inches, and cut openings for roof drains. Use Optigreen Standard Protection Mat, or for optimal performance use Optigreen Capillary Protection Mat for extensive roofs and Optigreen 900 g/m2 Heavy-Duty Protection Mat for intensive roofs.

T&Pvalvedripping

4. Spread Optigreen Granular Drainage Media or other free-draining inorganic media with well-graded particle size and neutral pH. Apply a minimum of one cubic yard per 150 square feet (2”) for extensive or semi-intensive roofs and one cubic yard per 75 square feet (4”) for intensive roofs. If feasible, the media should be dispensed from supersacks suspended from cranes to minimize the potential for damage.

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DESCRIPTION: Green roof systems of this type are drained by a base layer of lightweight, inorganic, granular media. To maximize water storage and minimize weight, the granular media should contain a significant percentage of porous material such as heat-expanded rock. To minimize separation, a well-graded blend of particles with sizes ranging from 1/8” to 1/2” is preferred. A slotted plastic drainage conduit with a triangular cross-section is embedded within the media to transport excess water.

2. Position Optigreen Drain Access Boxes over roof drains, adding sidewall elements as needed to match the system thickness. Construct drainage “trees” using Optigreen triangular drainage channels and tees. For optimum performance, any point on the roof should be within two channel lengths of the closest point of the drainage tree: this will be achieved if the “branches” of each drainage tree are laid four channel lengths (4 meters or 13 feet) apart.

6. Spread well-washed gravel screened to 3/8” minimum particle size. If feasible, the gravel should be dispensed from supersacks suspended from cranes to minimize the potential for damage.

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7. For extensive roofs, spread Optigreen Extensive Greenroof Growing Media at a minimum rate of one cubic yard per 150 square feet (2”). For intensive roofs, spread Optigreen Intensive Greenroof Growing Media as needed to obtain the required system thickness. Where possible, the media should be dispensed from supersacks suspended from cranes to minimize the potential for damage.

APPLICATION: Although granular media is heavy and labor-intensive to install when compared with other drainage systems, it provides an optimal environment for plant root growth. Granular drainage is recommended for roofs with slopes less than 1:12.

T&Pvalvediagram

Our products are ASME, ANSI and CSA (AGA) approved to protect water heaters from excess pressures and temperatures by discharging water. Thermostatic relief valves are completely automatic and reset after the pressure has been relieved.

COMPONENTS: A synthetic protection/water-storage fabric weighing 900 g/m2 (27 oz/yd2) is applied over the waterproofing or root-barrier membrane. For extensive roofs, a 900 g/m2 fabric with capillary water-equalization properties is recommended for superior performance. A network of slotted plastic triangular drainage conduit is assembled over the fabric and connects to roof drain access boxes. Then 2” of granular media is spread over the fabric for intensive roofs and 4” to 6” for semi-intensive and intensive roofs. A 200 g/m2 (6 oz/yd2) separation fabric is applied over the granular media and soil is spread over the fabric. See the following pages for installation details.

5. Optigreen Separation Fabric is engineered to retain soil without clogging while allowing plant roots to easily penetrate to reach water in the granular media and protection fabric. Unroll Optigreen Separation Fabric over the granular media, overlapping adjacent sheets at least six inches. Trim the fabric carefully at the edges.

3. Optigreen Retaining Edge should be installed on extensive green roofs approximately 30” from roof edges with roof drains and 18” from other edges. If there will be a gravel perimeter, the retaining edge will separate the soil and gravel and does not need to be attached. If there will be no gravel perimeter, the retaining edge should be attached to the waterproofing membrane or the protection fabric so it will stay in place.

Cash Acme is an industry leader in producing Temperature & Pressure (T&P) Relief Valves for water heaters or hot water storage tanks. In fact, we've been a trusted source of plumbing solutions for more than 100 years. Each pressure relief valve is tested for top plumbing performance, quality and efficiency before it leaves our factory.