Insulate Roof Rafters Properly

Place the plastic sheeting on top of the rolled insulation.

Insulate roof rafters properly.

Attic moisture problems are often the result of heated air from the living space rising up into the attic which is not heated. 2d extend insulation into joist space to reduce air flows. 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. Interior closed cell foam and blown in fiberglass or cellulose.

Staple them directly to the roof decking for better insulating roof rafters. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Airspace from the soffit to the ridge by installing a continuous air chute in each rafter bay. If your attic is going to be converted into livable space then you will need to insulate the roof rafters.

Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. With a warm roof the usual process is to split the insulation into two layers.

Stacking insulation between rafters warming of a flat roof. If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. To effectively ventilate your roof create a 1 in. For the same reason insulation shouldn t touch the roof s underside.

In this article we will tell you how to properly insulate the roof and explain in what cases it can generally be insulated and in which it is not worth it. If the plastic sheeting is in pieces overlap the pieces by 8 inches and staple it in place directly to the roof rafters and the wall. In finished attic rooms with or without dormer insulate 2a between the studs of knee walls 2b between the studs and rafters of exterior walls and roof 2c and ceilings with cold spaces above. Spray a more moderate thickness of closed cell polyurethane foam on the underside of the roof sheathing supplemented by a layer of air permeable insulation below and in direct contact with the underside of the cured spray foam.

Do not use plastic sheeting in this case. To install the air chutes staple them directly to the roof decking.