(I posted this in the wrong group before seeing this group.)
I’m a dyi-er. Our 20 x 8 porch has a cathedral ceiling that is now ready for insulation. The framing insp. wants baffales for a 1 inch air flow space over the insul. But the front of the porch has what I believe are called lookouts for where the plywood roof is nailed on.
How do I deal with air flow in this bay?
Thanks for any input.
Replies
Bird blocks, not lookouts.
Why are you insulating a porch? Sounds more like an enclosed room to me. If there is no heat and not an enclosed living space, there is no need for insulation or for baffles.
But I also question his requirement for another reason. if there is no way to vent these baffles out at the top, there is no way the baffles or an in vent at the soffit will do any good.
Be all that as it amy, you would simply take your drill with a 1" bit and drill out the offending block. You would then need to devise a screen to cover the holes against insects
Welcome to the
Taunton University of Knowledge FHB Campus at Breaktime.
where ...
Excellence is its own reward!
Piffin is correct on airlfow
what ever goes in , must come out
so you must be venting out somplace, and if your "rafters" are solid lumber , then you might need a continuious ridge at the top
and if it si a proch, why are you insulating it, unless it is a heated space, or your planing to make it so after inspections are over
Thanks. Yea, we call it a porch it really is enclosed living area. Remember, I'm just a learning dyi-er. There are 5 2 x 12 for rafters with one nailed to the original house. The the other one, at the end of the new "porch" had 2 x 4s perpendicular to the plywood and side and rear door. These are what I refer to as "lookouts." A friend who helped frame called them that. They arou about 18 inches long and start at one end of the 20 foot porch and go to the other end about every two feet.I still need to drill the 2 inch holes, 3 per bay, for the "bird blocks" and the screen it. Thie new additon has a ridge vent.So, you guys are saying to just cut those lookout out?
I think that I'm more confused now. If only one rafter is attache to the house, that implies that the rafters run parrallel to the house. I imagined a shed roof, but if the rafters run that way, and there are five of them, and the size is 20x8, then you must have 20 foot long 2x12s for rafters. Are they taperd to pitch both ways? if not, where is the ridge you speak of?
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Piffin, I think he might be saying that one end of the 2x12 is nailed to the house, and the other end has 2x4 decorative rafter tails. Probably to match the original house. I imagine 2x12's 16" o.c., rafter tails 24" o.c., so the rafter bays are obstructed.
Sorry, maybe this picture will help. The red lines are where the lookouts kind of ended up.So on the inside of the end rafter they are blocking the air flow to the ridge vent.Thanks for your time.....
I picture is worth a thousand...You were right, I was wrong, those are lookouts. don't drill or cut them outJust add a couple more for spacers so in that bay, the baffles are an extra 1-1/2" below the sheathing plywood. That way , You maintain full air flow and there is still space for the insulation
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Thanks. Got another question.
We have 6" concrete walls with a wood framed wall on top. The county said I could insulate the walls but need to bring the concrete walls up to a R19 value. Is that easy to do?
Dow blue board XPS foam insulation is rated about R-5 per inch and is good in damp environments and as a vapourbarrier. But typically, we only use 2" in a cellar wall. R-19 is the new wall standard, but I had not heard uit applied to basement walls before. I'm curious if someone else has comments here.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!