Insulation Under Roof Shingles

Some foam insulation are quite rigid and they are cut to size and placed under the roof.

Insulation under roof shingles.

Applying shingles directly over insulation is not recommended for a number of reasons. There are many kinds of foam insulation. Unroll roofing felt to cover the plywood on the roof and nail it in place. Typically when insulating a shingle roof homeowners also opt to seal and insulate the attic as well.

With this kind of roof the insulation follows the slope of the roof. In looking in the attic of the newer portion i can see the shingles of a portion of the roof on the original older part of the home to which the addition was framed directly on to. Insulation under the shingles of a vented attic will keep the attic cooler and the shingles hotter. The addition consists of a large living room bedroom and bathroom over a tuck under 2 car garage.

How to put rigid foam insulation on the roof before putting on shingles 1. In other cases it is sprayed into place where it later expands and fills the space under the roof. Asphalt shingles may be damaged or punctured when nailed onto a non rigid surface such as. It helps retain energy efficiently in your home which ultimately leads to major cost reductions and comfortability.

Foam is also a suitable material for use under roofing shingles. Put on your roofing safety harness and secure the safety rope to the top of the roof. But typically you care about the heat transmitted into the house and for that just add more attic insulation typically blown in cellulose. 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.

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. Foam insulation creates thermal resistance which is keeping that hot air out during the summer and your cool air inside. Insulated roof assemblies can be vented or unvented. The most practical way is to add ridgid insulation either in sheets or foamed in place which is the best.

You need to determine the compsition of your roof assembly. Insulating your attic with spray foam. Continuous free flow ventilation is impossible to achieve when applying shingles directly over insulation. The code calls for an r40 insulation plus ventilation over it.

Insulating a shingle roof provides the same benefits of providing insulation for a metal roofing material. Roofs with roofingfoil underlayment are 20 f to 40 f cooler than roofs without it. Nail metal flashing along the edges of the. In a vaulted ceiling case this should be a minimum on 1 in the us and 1 5 in canada.