Attic Insulation In Rafters Or Trusses

New rules and practical interpretation.

Attic insulation in rafters or trusses.

Hire a pro to install spray foam insulation. If you are planning to use wool then it is imperative you wear protective clothing goggles and a face mask since the wool is an irritant. Insulation on the floor of the attic figure 1. Ibc section 1203 3 outlines the only circumstances when a roof may have an unvented attic or enclosed rafter truss assembly.

This board forms the bottom member of each rafter and of course the ceiling of the space below. Encapsulating the rafter or top truss chord roof framing members with spray foam will improve the energy efficiency of the attic space. Safety precautions and mistakes to avoid during garage roof insulation. In unfinished space an attic insulation is typically laid between the joists.

This insulation strategy has not changed in recent code iterations and is not discussed in this article. The joists might then be covered with osb or plywood to form an attic floor for storage. The are similar to trusses in this regard. We prefer recycled insulation for obvious reasons.

If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor. Insulating below the rafters normally people use mineral wool or insulation boards to insulate the rafter space. In the case of a cold roof structure the insulation is placed between or between and under the rafters or at ceiling joist level and the roof is ventilated by leaving a 50mm gap above the insulation which vents air to the outside. Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials.

If you ve measured your attic space and feel you have enough room to accommodate living space chances are you have rafters or you have special trusses called attic trusses which create a large open space under the peak of the roof. Although not expressly. By contrast conventional trusses have supports called webbing that zigzag through the attic space. You can use rigid foam panels or do as tom silva does with nearly all houses these days.

This is because the effects of thermal bridging are limited which also results in the elimination of melt lines on the roof surface in cold climates. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. An attic conversion is a great way.