Flat Roof Rigid Foam Insulation

Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation.

Flat roof rigid foam insulation.

Most do it yourselfers can actually install rigid foam board insulation on their own. The thinnest board is 1 inch. Foam control flat roof insulation is a cost effective durable and energy efficient solution for roof insulation. The most efficient and best insulation used is rigid foam polyiso.

This type of insulation works best for an exposed ceiling directly below a flat roof. Insulated roof assemblies can be vented or unvented. A roof over a vented unconditioned attic does not need to include any insulation. No long term r value loss or thermal drift.

Iso is available in a range of thicknesses that come in increments of 1 inch. Install it anywhere from the roof to the foundation. It accounts for over 60 of all installs. Rigid foam insulation also known as insulating boards provide high r values.

You can expect to pay about 55 100 sq ft. While expensive the best insulation is polyiso rigid foam. Rigid foam is produced in various size panels 4 ft x 8 ft 4ft x 4ft etc. You can even place it under the foundation slab.

After the roof deck is prepared the rigid foam boards need to be cut to size to fit snugly together on your roof. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. Install nailbase for cladding. The rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets.

For a 1 inch board equivalent of 6 r value. Flat roof insulation installation. Foam control flat roof insulation is compatible with all major roofing materials and assemblies. They keep your home at a comfortable temperature without the need to crank your heat.

Installing it will probably cut your energy bills a bit but will definitely make your living quarters more comfortable. Rigid insulation is one of the best tools to reduce your energy costs. 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. With this kind of roof the insulation follows the slope of the roof.

The panels need to fit together tightly to help prevent warm air from leaving the top of the building. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance.