Insulation Under Roof Shingles

Applying shingles directly over insulation is not recommended for a number of reasons.

Insulation under roof shingles.

Insulated roof assemblies can be vented or unvented. Asphalt shingles may be damaged or punctured when nailed onto a non rigid surface such as. Unroll roofing felt to cover the plywood on the roof and nail it in place. In a vaulted ceiling case this should be a minimum on 1 in the us and 1 5 in canada.

Roofs with roofingfoil underlayment are 20 f to 40 f cooler than roofs without it. But typically you care about the heat transmitted into the house and for that just add more attic insulation typically blown in cellulose. Continuous free flow ventilation is impossible to achieve when applying shingles directly over insulation. Foam insulation creates thermal resistance which is keeping that hot air out during the summer and your cool air inside.

The most practical way is to add ridgid insulation either in sheets or foamed in place which is the best. This underlayment goes great under metal tile slate standing seam and other metal and tile roofing systems that have a batten system or a naturally occuring air space between the roofing material and the deck. Insulation over roof shingles. Nail metal flashing along the edges of the.

Insulating a shingle roof provides the same benefits of providing insulation for a metal roofing material. Foam is also a suitable material for use under roofing shingles. Insulating your attic with spray foam. The addition consists of a large living room bedroom and bathroom over a tuck under 2 car garage.

However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. You need to determine the compsition of your roof assembly. Typically when insulating a shingle roof homeowners also opt to seal and insulate the attic as well. The code calls for an r40 insulation plus ventilation over it.

There are many kinds of foam insulation. Some foam insulation are quite rigid and they are cut to size and placed under the roof. Put on your roofing safety harness and secure the safety rope to the top of the roof. In other cases it is sprayed into place where it later expands and fills the space under the roof.

It helps retain energy efficiently in your home which ultimately leads to major cost reductions and comfortability. What this study means is that you can insulate the roof deck of your home with foam insulation without any adverse effects to your shingles. A roof over a vented unconditioned attic does not need to include any insulation. With this kind of roof the insulation follows the slope of the roof.