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More details regarding how to insulate an unvented roof assembly is offered inside the write-up on this page.
It is safe to claim that an current dwelling does not have good roof air flow if there are not any soffit vents or ridge vents. It's also Secure to mention that, although there are soffit vents and ridge vents, the roof isn't really ventilated if it features valleys, hips, dormers, or skylights.
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A different dilemma I am obtaining re: Ice & Drinking water Shield is always that I used to be seeking forward to eliminating the newly positioned asphalt felt that's at present more than the pine T&G and replacing it with a unique product, since the asphalt smell from the felt is coming throughout the T&G ceiling and bothering me (just in the event that I necessary any proof that that ceiling is horribly air permeable...). But then I study in the Grace Ice & H2o Protect set up instructions that "Due to its slight asphaltic odor, will not utilize Grace... Ice & H2o Shield... the place the membrane is exposed to interior residing places." So if I exchange the felt with Ice & H2o Defend or a similar asphalt-primarily based item, I would likely just be leaping from the fireplace in to the frying pan, odorwise.
Insulated cathedral ceilings are a relatively recent phenomenon. The fad for insulated cathedral ceilings (and terrific rooms) definitely took off while in the nineteen seventies and 1980s, when illustrations started popping up like mushrooms after a warm rain.
First, can it be straightforward to establish no matter if a roof is ventilated? If no soffit vents or other facet vents are visible over the roof from the bottom, does that imply the roof is not ventilated?
Here is the standard respond to for individuals who have to comply with most building codes (The solution arises from an write-up by Mike Guertin):
Another way to include R-value for your roof assembly is to include 1 or 2 layers of rigid foam during the roof assembly — possibly over the roof sheathing or beneath the rafters.
We will give it a test. Current is usually a fourteen 12 months previous roof with two" of closed cell roofing foam by having an acrylic elastomeric coating.
Q. "For an unvented design without any insulation previously mentioned the sheathing, how about utilizing wood fibreboard between the rafters specifically down below As well as in contact with the sheathing?"
I'm a homeowner with cathedral ceilings that were added all through reworking and expansion of my residence from the late 90s. Only the ridge beam is exposed. The rest of the ceiling is roofed with drywall. With the yrs There's been some condensation leak down the facet with the ridge beam on some mornings in March/April.The home is about 4 miles within the coast in Southern Califonia, so zone 3b. You will find 4 recessed lights during the ceiling around the side on the beam that will get the condensation, but Additionally, there are lights within the aspect that is always dry. There isn't a air conditioning in the home. Warmth is applied over the night time only about a dozen evenings a calendar year, not throughout the condensation. Commonly the Home windows are open up. It appears the condensation exhibits up on mornings when there is no maritime layer (no clouds each morning) plus the temperature heats up pretty early following a very great night. The situation ceiling faces east/west along with the condensation is to the east experiencing side of your beam. The roof is black find asphalt shingle. I do know that there is no caulk/sealant between the aspect with the beam and also the location where by the drywall butts towards it, so there is a modest air hole there.
Problem much like Eric, over. If closed mobile foam is sprayed or "cobbled" from xps, do You need to fill your entire House, or only to thickness for desired R price?
Will it make sense to spray and Lower and cobble four inch closed cell foam/board on underside of sheathing accompanied by fiberglass Within the bays and one inch of eps/iso underneath the rafter (to stop thermal bridging) prior to finishing with drywall? Will I produce a vapor sandwich and greater go away the ultimate EPS and settle for the thermal bridging?