Flat Roof Insulation Slope Layout

Roof insulation materials to avoid.

Flat roof insulation slope layout.

If insulation is installed below the flat roof deck this is called a cold roof. Some so called experts online may recommend the following claiming to achieve a greater r value at a lower cost. Save money by installing fiberglass insulation and framing out roof slope using osb board substrate. Polyiso xps and eps roof.

Flat over structural slope backwash detail backwash overlayed on adjacent 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. Tapered backwashes can also help reduce the insulation height at the roof edge. The crickez system helps to simplify roof crickets with quicket. A note to consider before construction.

To add a slight slope to an entirely flat roof to help shed water install tapered foam board insulation underneath a membrane roof. Consider geography budget and use for the roof to determine the best option. Tapered roof insulation and crickets are designed to provide effective drainage for epdm tpo pvc and built up bur membranes. From there the flat roof system you choose will determine the materials you apply.