What Insulation To Use On A Flat Roof

It should be of the maximum available thickness.

What insulation to use on a flat roof. The best long term solution. While expensive the best insulation is polyiso rigid foam. For flat roofs we suggest the use of insulation upstands to prevent thermal bridging. How to improve insulation levels of flat roofs rigid foam.

Materials used to make insulation in these three types include mineral wool fiberglass cellulose fiber vermiculite styrofoam polystyrene and polyurethane. What is polyiso insulation. You can expect to pay about 55 100 sq ft. These are small sections of insulation which are positioned vertically around the edges of some constructions of flat roofs.

The typical u value of an existing uninsulated flat roof is 1 5w m2k. Like other roofs insulating a flat one requires ample ventilation a vapor barrier and sealed bypasses. Use rigid foam insulation panels on your flat roof before applying the final roof covering or inside the. Extruded polystyrene xps is also an optimal choice along with expanded polystyrene eps.

The main reason for using these when insulating a roof is to prevent cold bridging at the junction between the roof and the exterior walls. If in general the insulation be it mineral wool or polystyrene remains locked in a protected layer and completely immobilized then on the roof in use the effect of dynamic loads is very. Flat roof hello there s a lot of good material in this post for comment. Call in a specialist contractor to do the work.

So you see insulating from outside using a hot roof system is the best option. Gropius and le corbusier in the 20s sought to capture the machine age by using industrial style roofs. The chosen insulation laid on top of this should be able to take the weight of anything put above it on the roof without compression or protected from compression by further sheeting. The most expensive and highly recommended insulation is polyisocyanurate polyiso rigid foam.

Crushed glass is heated after being placed into a mould and can be bought in flat or tapered blocks for use in insulation on flat roofs. Install composite insulation made from expanded polystyrene or eps foam laminated with a. We recommend having at least 20 r value worth of material for optimal energy efficiency. We must not forget about the fact that the conditions for using insulation on a flat roof are radically different from all other insulation systems.

If you re unsure which material would best suit your flat roof project always consult an insulation or roofing professional for advice. Roofing professionals emphasize that the choice of flat roof insulation should feature the appropriate r value. The material that works best depends largely upon preference in a given situation. For a 1 inch board equivalent of 6 r value.