Flat Roof Rigid Foam Insulation

With this kind of roof the insulation follows the slope of the roof.

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. A roof over a vented unconditioned attic does not need to include any insulation. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. Iso is available in a range of thicknesses that come in increments of 1 inch.

Flat roof insulation installation. No long term r value loss or thermal drift. It is top quality and the most cost effective product for your flat roof. The most efficient and best insulation used is rigid foam polyiso.

Install it anywhere from the roof to the foundation. The rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation. Insulated roof assemblies can be vented or unvented.

You can expect to pay about 55 100 sq ft. You can even place it under the foundation slab. Installing it will probably cut your energy bills a bit but will definitely make your living quarters more comfortable. Foam control flat roof insulation is compatible with all major roofing materials and assemblies.

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. Install nailbase for cladding. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance.

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. The panels need to fit together tightly to help prevent warm air from leaving the top of the building. While expensive the best insulation is polyiso rigid foam. We recommend having at least 20 r value worth of material for optimal energy efficiency.

Rigid foam insulation also known as insulating boards provide high r values. Most do it yourselfers can actually install rigid foam board insulation on their own. Foam control flat roof insulation is a cost effective durable and energy efficient solution for roof insulation. It accounts for over 60 of all installs.

The thinnest board is 1 inch. For a 1 inch board equivalent of 6 r value.