Rigid Insulation Sloped To Roof Drain

Backwash overlayed onadjacent flat over structural slope when roof drains are located a great distance away from a sloped roof edge more than 48 it can be more cost effective to use a tapered backwash.

Rigid insulation sloped to roof drain.

The gemini drain set is the only 4 x 4 drain sump that requires no assembly by the contractor. In contrast tapered expanded polystyrene eps rigid foam insulation is available in blocks up to 40 inches thick and can be cut to virtually any slope depending on the drainage needs of the building. This is the industry s first one piece pre cut drain sump. Tapered rigid insulation is polyisocyanurate insulation or eps insulation custom manufactured to provide a slope.

A typical interior roof drain assembly occupies about a 4 by 4 square area with a per foot tapered slope. Tapered backwashes can also help reduce the insulation height at the roof edge. Over the course of the roof system the tapered insulation will create a slope toward the drains which typically ranges from 1 8 slope 1 down every 8 to slope 1 down every 2. Because of its size and customization options tapered eps often can be installed in a single layer.

The first piece may go from 1 high to 1 high then the next piece will go from 1 high to 2 high. As a general rule if the insulation is 2 thick or less a 4 by 4 is sufficient. If the insulation reaches 3 or thicker an 8 by 8 creates a more gradual slope while still providing the necessary momentum. The dimensionally stable gemini drain set provides a 4 way slope to the roof drain to prevent ponding and premature roof failure.