
Exhaust vents on a roof need someplace to pull intake air from. If there are no intake vents at the bottom of the roof, then there are risks with putting in a ridge vent. One side of the ridge vent may start to draw air in, which is bad because it can bring in bad weather, especially when the roof is fairly low pitch to boot. Putting the roof on battens will be helpful. It creates a good thermal break. You could, for extra efficiency, install vertical battens first along the rafters and then your horizontal battens. This creates vertically oriented air chambers beneath the roof which can then be vented with intake at the bottom and exhaust at the ridge.
If the intake vents are working and air is flowing through the attic, then installing a ridge vent is fine. Make sure that the product you choose is installed appropriately and approved for 3:12 roof pitch.
Where is your intake air for the ridge vent coming from?
If you strip the roof (purlins), you won't have any intake ventilation in this case.
If the soffits are continuous around the perimeter and are open, so should the ridge. The ventilation should be continuous and in balance with the ridge vent.
hey Tod, my question is i have a single 16 wide mobile home with a 3/12 pitch roof. i'm striping my roof with 1x4's and am having a metal roof installed over my existing shingles. would it be wise to rip all the way down the ridge a 1'' opening on each side of the ridge and blanket the ridge opening with a roll of attic mesh roll insulation called gaf cobra pro series attic ventilation before installing ridge cap,also would be installing a cv3 ridge rib vent inclosure on each side of ridge cap.attic has little insulation. would this help with heating and cooling or would this method cause condensation and mold issues. thanks for all your help. RD
hey Tod, my question is i have a single 16 wide mobile home with a 3/12 pitch roof. i'm striping my roof with 1x4's and am having a metal roof installed over my existing shingles. would it be wise to rip all the way down the ridge a 1'' opening on each side of the ridge and blanket the ridge opening with a roll of attic mesh roll insulation called gaf cobra pro series attic ventilation before installing ridge cap,also would be installing a cv3 ridge rib vent inclosure on each side of ridge cap.attic has little insulation. would this help with heating and cooling or would this method cause condensation and mold issues. thanks for all your help. RD thanks TOD and ERIC my trailer has about a 6'' overhangthats soffit vented.
thanks Tod, i have about a 4-6'' soffit all the way around the trailer.pulled off 4 attic vents about 12''x12'' openings off along the roof by the ridge. Will be covering the openings with galvanized mesh wire so it can breath. Is this enough ventilation to not install a ridge vent?Appreciate your thoughts, thanks! RD