Styrofoam Insulation On Flat Roof

Also called styrofoam insulation this is the least expensive material.

Styrofoam insulation on flat roof.

Foam control plus provides more r value at a lower cost xps use blowing agents that cause r value loss over time. The foil insulation goes on top of the moisture barrier followed by the roof covering. Some products have reinforced facing to make them sturdier. A roof over a vented unconditioned attic does not need to include any insulation.

Foam control plus flat roof insulation outperforms xps. It is top quality and the most cost effective product for your flat roof. Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation. We recommend having at least 20 r value worth of material for optimal energy efficiency.

While expensive the best insulation is polyiso rigid foam. The type that is right for your flat roof insulation job depends upon the state of the roof expert opinion on the best type and your budget. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Foam control plus available in 15 25 40 and 60 psi strengths at a lower cost foam control plus has a superior drying potential foam control plus is more vapor permeable to help avoid moisture problems.

If you use bubble foil or rigid foam insulation it also goes on top of the moisture barrier. You can expect to pay about 55 100 sq ft. With a flat roof however this becomes a major concern. Rigid foam panels are available in thickness.

It provides r values that range from 3 6 to 4 2 per inch. Closed cell polyurethane spray foam will prove ideal for thermal insulation of a flat roof. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Once the roof demo was complete and the flat roof was cleared of any remaining debris some rotted 2x material around the perimeter of the roof was replaced.

Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. Such an insulating solution involves applying several layers of pur foam with each layer around 1 2 cm thick. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. The effective roof insulation layer may range in thickness from 3 to 12 cm as needed.

For a 1 inch board equivalent of 6 r value.