We have been recently installing lots of closed cell foam on to the roof sheathing with fantastic results. Nonetheless I'm wondering if you have read about what occurs once the inevitable roof leak occurs?
If you put in 2x4s (or 2x3s on edge, mounted with lengthy screws) perpendicular towards the rafters, you'll handle many of the thermal bridging issue without the ought to increase a layer of rigid foam.
A lot of the information I run across is apparently from your cellulose market that statements wind-wash is an enormous challenge with fiberglass; and through the fiberglass business which asserts that the cellulose team overstates The difficulty Which to the extent wind-wash takes place it is absolutely inconsequential.
Make sure the roof assembly is as near airtight as you may make it. If you're making use of fluffy insulation, you'll need two air obstacles: one particular underneath the insulation, and 1 over the insulation.
I now recognize that stucco cannot be placed on a roof, so I'll revert on the a metal roof, but nonetheless want to own an unvented attic. I have read by means of "Making a conditioned attic", and am nonetheless undecided concerning The easiest way to commence.
Should you be developing a cathedral ceiling, the most significant air-barrier blunder is to put in tongue-and-groove boards as your finish ceiling devoid of to start with installing taped gypsum drywall. A board ceiling is notoriously leaky, and such a ceiling is frequently linked to roof sheathing rot.
Martin, I am grateful for your time, and after looking at many of the replies, i can see you are excited about creating matters right. Ideal for individuals, along with the Earth. Thanks for what you do!! Ryan Nelson
Finally, I kow the recessed lights is Awful, but what can I do if it is by now set up? With one of the lights I adjusted it about to the pendant light which lowered the warmth close to the roof even so the air barrier continues to be a challenge.
The roof was shingles on t&g pine decking. Insulation was correct up versus that pine decking considering that seventy seven and is particularly 2014. Stuff looks like it absolutely was mounted yesterday. Not a bad spot everywhere, no roof vents completely unvented roof.
My feeling is if we are concerned about air leakage compromising the insulation's performance, vent channels are problematic.
Magic bullet position is not reached. It is a structure for just a reduced slope roof. It is very much alongside the strains of Doug McEvers use of significant perm fibre board to make vent channels over dense packed cellulose.
Therefore the concern is: seal the stucco vents and include the spray foam roof and Don't fret about condensation? There is certainly very little low-hanging fruit inside our type of development, In particular on present properties, Which explains why individuals are remaining sucked into the spray foam roof rip-off.
Q. "I have been using rigid breadboard type expanded polystyrene from the rim joists and considered precisely the same could possibly be set beneath the sheathing between the rafter bays."
The home website here is at about 4,500 ft. We only get about 3' of snow a 12 months and it hardly ever stays to the roof for more than 7 days a couple times a 12 months. I am on an exceedingly restricted price range, just wanting to make the place livable. Any recommendations are welcome.