WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
If you wish to do it right, you might want to address air leaks, tackle your recessed can trouble, and insert adequate R-value to at least satisfy minimum amount code requirements. It can be a great deal of operate, but it isn't really rocket science. Fixing these problems could possibly be high priced, even so.
A. There is a code prerequisite to get a vapor retarder in a few varieties of assemblies, but there is no prerequisite for a vapor barrier. Your layer of rigid foam is now a vapor retarder. No further more vapor retarding layer really should be installed.
You happen to be in local climate zone five. I discussed the minimal R-values with the strategy that you are having in among the list of paragraphs higher than, in which I wrote, "Based on .
The first vent baffles to hit the market — the basic Right-Vent in the seventies and ’80s — were cheap, flimsy things manufactured from slender polystyrene. Polystyrene baffles have a number of shortcomings: remaining slender and flexible, they might’t resist the pressures from dense-packed cellulose or blown-in fiberglass; they don’t ventilate the entire width from the rafter bay; and as typically set up, they permit air to leak out the highest with the insulated assembly.
Q. "I'm thinking if I should really furr out the rafters to get the specified thickness of spray foam, or if setting up some inches of polyiso foam to your underside in the rafters, after the spray foam, could perform?"
Thanks to your recommended addition for the listing of components for creating website-developed vent baffles. I have edited the textual content of my blog to include your recommendation.
Yes a cathedral ceiling detail could be pretty very similar even so the problem of numerous cathedral ceilings will be the included structural features, electrical packing containers, and the will for wood board ceilings all which start compromising the drywall layer which inside your detail is applied for the air barrier.
If a creating inspector insists that you put in some sort of interior “vapor barrier,” you'll be able to normally install a sensible vapor retarder like MemBrain to fulfill your inspector.
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I am a homeowner with cathedral ceilings that were being extra for the duration of remodeling and expansion of my residence in the late 90s. Just the ridge beam is exposed. The rest of the ceiling is roofed with drywall. In the decades there has been some condensation leak down the side on the ridge beam on some mornings in March/April.The house is about 4 miles through the coast in Southern Califonia, so zone 3b. There are actually 4 recessed lights within the ceiling on the facet with the beam that gets the condensation, but In addition there are lights about the facet that is always dry. There is absolutely no air con in the house. Heat why not try here is made use of through the evening only about a dozen nights a yr, not over the condensation. Normally the Home windows are open up. It seems the condensation shows up on mornings when there is not any marine layer (no clouds in the morning) as well as temperature heats up relatively early following a extremely cool evening. The trouble ceiling faces east/west and also the condensation is to the east going through facet of your beam. The roof is black asphalt shingle. I know that there is not any caulk/sealant in between the facet of your beam as well as the put wherever the drywall butts from it, so You will find there's modest air hole there.
Back to your vent visit their website concept. I actually Believe venting a roof that is airsealed in the interior perfectly and developed without vent chutes is potentially the best way to construct cathedral ceilings.
Superb report and discussion. I've a matter about an current unvented attic assembly. The rafters are 2x4's as well as the bays involving them are wholly crammed with shut mobile spray foam. I would want to incorporate two 1in layers of polyiso towards the interior of attic then go over with a vapor open membrane to airseal the assembly.
I've an urgent challenge and might be pretty grateful for suggestions on insulating our dwelling’s loved ones space cathedral ceiling, built in the 1970’s and presently currently being re-roofed. (The aged roof continues to be torn off, and they are about to start setting up The brand new shingles.) Your house is in San Jose, CA, local climate zone 3. The contractor does not desire to put insulation previously mentioned the sheathing, that is 2x8 pine tongue and groove, which up til now served as the finish ceiling.