Styrofoam Insulation On Flat Roof

If you use bubble foil or rigid foam insulation it also goes on top of the moisture barrier.

Styrofoam insulation on flat roof. Rigid foam panels are available in thickness. We recommend having at least 20 r value worth of material for optimal energy efficiency. The effective roof insulation layer may range in thickness from 3 to 12 cm as needed. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

For a 1 inch board equivalent of 6 r value. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. 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 flat roof insulation outperforms xps.

While expensive the best insulation is polyiso rigid foam. The foil insulation goes on top of the moisture barrier followed by the roof covering. Some products have reinforced facing to make them sturdier. Such an insulating solution involves applying several layers of pur foam with each layer around 1 2 cm thick.

Foam control plus provides more r value at a lower cost xps use blowing agents that cause r value loss over time. It provides r values that range from 3 6 to 4 2 per inch. It is top quality and the most cost effective product for your flat roof. Also called styrofoam insulation this is the least expensive material.

Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. A roof over a vented unconditioned attic does not need to include any insulation. Insulated roof assemblies can be vented or unvented. With a flat roof however this becomes a major concern.

Use rigid foam insulation panels on your flat roof before applying the final roof covering or inside the house before adding sheetrock or paneling. 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. 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. With this kind of roof the insulation follows the slope of the roof.

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.