Install foam attic vent chutes between every pair of roof rafters in the narrow triangular section where the roof meets the attic joists. The vent chutes keep the attic’s passive ventilation ...

Most building codes require a specified minimum amount of headroom. It's often tough to meet this requirement when insulating a finished attic, especially since most codes require insulation equal ...

Roofing insulation gets installed on the roof slope, above and below the rafters, while attic insulation is installed in the ceiling pane. Roof insulation is especially vital if your home has a ...

You should lay an appropriate (usually R-30) insulation on the attic floor, but avoid tucking it down into the area where the roof rafters meet the top of exterior walls and joist.

A: You are correct and your girlfriend is wrong. Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces.

Q: I am checking into having the fiberglass insulation removed from my attic floor and going with open-cell foam. At first, I leaned toward having the foam sprayed into the floor, where the ...

The rest of the ceiling space is created by the underside of the roof rafters. The slanted ceiling is a huge problem area. Many Cape Cod roofs are framed with 2-by-6s and, on rare occasions, 2-by-8s.

It is not critical how neatly the foil is stapled under the roof rafters. Most two-sided foil is reinforced with nylon mesh. Low-cost single-sided foil is the least expensive type.

Q. I have an attic that was just remediated for vermiculite insulation. It is wide open. A company said I should insulate the roof rafters instead of the joists (the floor) and board up the ridge ...

However, I do have a concern about spraying foam directly on the underside of the roof sheathing and rafters. Closed cell insulation will not allow water to pass through it.