Flat Roof Rigid Foam Insulation

After the roof deck is prepared the rigid foam boards need to be cut to size to fit snugly together on your roof.

Flat roof rigid foam insulation.

Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation. For a 1 inch board equivalent of 6 r value. This type of insulation works best for an exposed ceiling directly below a flat roof. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

The panels need to fit together tightly to help prevent warm air from leaving the top of the building. Rigid foam insulation also known as insulating boards provide high r values. Foam control flat roof insulation is a cost effective durable and energy efficient solution for roof insulation. You can even place it under the foundation slab.

It accounts for over 60 of all installs. The thinnest board is 1 inch. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. Insulated roof assemblies can be vented or unvented.

You can expect to pay about 55 100 sq ft. The rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. Installing it will probably cut your energy bills a bit but will definitely make your living quarters more comfortable. Install nailbase for cladding.

A roof over a vented unconditioned attic does not need to include any insulation. Most do it yourselfers can actually install rigid foam board insulation on their own. The most efficient and best insulation used is rigid foam polyiso. It is top quality and the most cost effective product for your flat roof.

They keep your home at a comfortable temperature without the need to crank your heat. We recommend having at least 20 r value worth of material for optimal energy efficiency. With this kind of roof the insulation follows the slope of the roof. Iso is available in a range of thicknesses that come in increments of 1 inch.

While expensive the best insulation is polyiso rigid foam. Rigid insulation is one of the best tools to reduce your energy costs. Flat roof insulation installation. 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.

No long term r value loss or thermal drift. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance.