Styrofoam Insulation On Flat Roof

You can expect to pay about 55 100 sq ft.

Styrofoam insulation on flat roof.

The effective roof insulation layer may range in thickness from 3 to 12 cm as needed. Also called styrofoam insulation this is the least expensive material. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. With this kind of roof the insulation follows the slope of the roof.

Rigid foam panels are available in thickness. While expensive the best insulation is polyiso rigid foam. Some products have reinforced facing to make them sturdier. Insulated roof assemblies can be vented or unvented.

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. The foil insulation goes on top of the moisture barrier followed by the roof covering. Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation. It provides r values that range from 3 6 to 4 2 per inch.

Use rigid foam insulation panels on your flat roof before applying the final roof covering or inside the house before adding sheetrock or paneling. If you use bubble foil or rigid foam insulation it also goes on top of the moisture barrier. 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. It is top quality and the most cost effective product for your flat roof.

Closed cell polyurethane spray foam will prove ideal for thermal insulation of a flat roof. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. 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.

Foam control plus provides more r value at a lower cost xps use blowing agents that cause r value loss over time. For a 1 inch board equivalent of 6 r value. Foam control plus flat roof insulation outperforms xps. 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.

A roof over a vented unconditioned attic does not need to include any insulation.