How To Insulate A Vaulted Ceiling 2x6

When renovating an older home whose roof rafters are only 2x6 really 5 1 2 x 1 5 in dimension the available space for insulation and ventilation is limited therefore limiting the options for a combination of good under roof ventilation and high insulation r values in the cathedral ceiling.

How to insulate a vaulted ceiling 2x6. Insulate a cathedral ceiling by ensuring there is no opportunity for drafts to get into the room. A how to on installing certainteed s fiberglass insulation batts into attic and cathedral ceiling applications. Check the joists and wall plates for any holes or openings. The current plan is to use batts of some kind in the bays take care to air seal the interior surface avoid penetrations air seal the vent channel too bays fully sealed double prime the inside surface for vapor resistance.

Stand on a ladder and using a caulk gun seal any areas where there is visible wiring or plumbing. To keep fiberglass batts from blocking airflow rafter baffles should be. Straight bays 2x12 24 o c. It s a roughly 30x24 space with a 45deg.

I live in vermont so it s recommended to have around r50 insulation in the ceiling. The garage is 12x20 and has about a 27 degree pitch in the roof with 2x6s as rafters. If i retain the vaulted ceiling i ll need to furr out the 2x6 s to achieve the recommended r value. In a vaulted ceiling however the only fresh air route lies between the insulation and the underside of the roof deck.

Seal all ceiling openings. How to increase the interior ceiling joist for r38 insulation. Have a newly framed vented cathedral ceiling to insulate.