Should You Insulate Your Roof Rafters

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You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters.

Should you insulate your roof rafters.

Insulating between rafters will do no good because the attic should be ventilated and the rafter insulation would be between two unheated spaces. Covering up the soffit vents with loose fill or batts which can happen if you stuff insulation along the eaves is a huge no no. Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. The current trend is for a warm roof where insulation is installed between the rafters thereby keeping the roof timbers warm.

The idea is to allow some air to circulate through some part of the attic under the roof but outside the insulation to prevent moisture build up. Do not use plastic sheeting in this case. A vent baffle should be installed between the insulation and the roof decking to maintain the ventilation channel. Reed hedges dec 10 10 at 20 06.

In order to avoid damage to the roof deck you should insulate ceilings to create an air barrier between the living space and an unfinished attic or airspace underneath the roof deck. If you have vents in the walls of the attic or in the roof ridge then the insulation can go all the way to the roof. You can add insulation to the floor. If your attic is going to be converted into livable space then you will need to insulate the roof rafters.

The first decision is whether to insulate a pitched roof at ceiling or rafter level. Consider using high density r 30 batts which are as thick as r 25 batts but fit into 2x10 framing. For the same reason insulation shouldn t touch the roof s underside. 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.

The technically correct approach depends on a number of factors. Place the plastic sheeting on top of the rolled insulation. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Attic moisture problems are often the result of heated air from the living space rising up into the attic which is not heated.

The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. If there is a floor you will need to remove it to properly insulate the roof rafters.

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