Install Rigid Foam Board Insulation Roof

Scope remove existing roofing and non adhered underlayment to expose roof sheathing.

Install rigid foam board insulation roof.

As my article states you need a minimum of about 1 5 inch of eps 1 inch of xps or 1 inch of polyiso. Hold the foam in place while you use 2 inch. The foam panels need to be secured to the roof around every 12 inches for safety. Start at the bottom of the roof and place the first piece of rigid foam insulation against the metal flashing starting at the center line.

How to install rigid foam insulation step 1. Position the first foam panel perpendicular to the wall or ceiling framing. This is followed by a moisture barrier which is typically 30 or. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets.

To install measure the foam insulation panels to the roof s dimensions. It will degrade its r value. Installed on the roof exterior foam makes the living space below more comfortable and reduces the likelihood of ice dams. Talking about metal roof insulation this thing is one of the most challenging things people work in this field is facing it demands and requires excellent skill and expertise which you may only get from a reputable roofing contractor.

All foam boards absorb water vapor. Proper installation of roof insulation when installing a new roof or redoing an existing one the roof decking goes on first. Cut panels to fit using a box cutter or snap away utility knife. A helpful hint for installation is to use a straight edge along the cut line to ensure the panels fit best.

Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. Use a straight edge knife or utility knife to cut the panels to size. Keep foam board insulation away from direct sunlight prior to installation.

Install rigid insulation board in multiple layers with joints offset vertically and. Cover the insulation with a vapor barrier before you install it. If you want to install rigid foam above your roof sheathing in climate zone 3 then 1 2 inch of rigid foam board is not ideal this rigid foam layer needs a minimum r value of r 5 and that s impossible with 1 2 inch of foam. 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.

Nail it around the edges with roofing nails.