A properly designed tapered roof insulation system not only provides the necessary r value and the support for the roof system but it helps extend the life of the roof system because it provides.
Flat roof insulation slope layout.
Consider geography budget and use for the roof to determine the best option.
Polyiso xps and eps roof.
Save money by installing fiberglass insulation and framing out roof slope using osb board substrate.
A note to consider before construction.
Tapered roof insulation and crickets are designed to provide effective drainage for epdm tpo pvc and built up bur membranes.
Some so called experts online may recommend the following claiming to achieve a greater r value at a lower cost.
To add a slight slope to an entirely flat roof to help shed water install tapered foam board insulation underneath a membrane roof.
From there the flat roof system you choose will determine the materials you apply.
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.
The crickez system helps to simplify roof crickets with quicket.
Roof insulation materials to avoid.
The goal of tapered roof insulation systems is to eliminate ponding standing water on a membrane when the roof deck does not provide adequate slope.