Thorsten Chlupp is within a Considerably more difficult climate and he seems to be executing fantastic with basic unfastened fill to the attic ground....naturally he is employing "enough" amounts (cellulose galore)and he has baffles near the soffit.
My perception is that if we're worried about air leakage compromising the insulation's performance, vent channels are problematic.
I reside in northern Vermont, and I haven't got sufficient expertise with air con to answer your dilemma about condensation on interior ducts.
Looks like you have got the framing and roofing in position. Your choices are explained while in the post previously mentioned--you could insert venting by setting up baffles underneath the sheathing to carry back again the insulation, or you are able to install a minimum of R-twenty of air impermeable insulation.
I'm a homeowner with cathedral ceilings that were added throughout remodeling and expansion of my home within the late 90s. Just the ridge beam is exposed. The rest of the ceiling is roofed with drywall. From the many years There was some condensation leak down the facet from the ridge beam on some mornings in March/April.The house is about 4 miles within the coast in Southern Califonia, so zone 3b. There are four recessed lights within the ceiling to the aspect on the beam that gets the condensation, but You will also find lights around the side that is often dry. There's no air-con in the house. Heat is applied during the evening only a couple of dozen evenings a 12 months, not through the condensation. Generally the Home windows are open up. It appears the condensation demonstrates up on mornings when there is no maritime layer (no clouds each morning) along with the temperature heats up rather early following a very amazing evening. The problem ceiling faces east/west plus the condensation is around the east going through side of the beam. The roof is black asphalt shingle. I am aware that there's no caulk/sealant in between the side of your beam as well as place where the drywall butts against it, so There exists a smaller air gap there.
Will it seem sensible to spray and Slice and cobble 4 inch shut mobile foam/board on underside of sheathing accompanied by fiberglass inside the bays and one inch of eps/iso beneath the rafter (to stop thermal bridging) right before finishing with drywall? Will I produce a vapor sandwich and greater leave the final EPS and accept the thermal bridging?
Many thanks for the recommended addition towards the listing of supplies for earning site-designed vent baffles. I've edited the textual content of my website to incorporate your recommendation.
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This is often an option I'm considering in my household to save lots of the former house owners recently set up roof shingles, although the depth on the rafters are not able to accomodate enough insulation to fulfill code. I am wanting to know if I should really furr out the rafters to obtain the specified thickness of spray foam, or if setting up a number of inches of polyiso foam towards the underside in the rafters, after the spray foam, could function?
If you end up picking to setup open up-cell spray foam instead of shut-mobile spray foam, your roof assembly should be able to dry to some degree to the inside. Just Make certain that the spray foam layer is thick ample to keep the rafter bays previously mentioned the dew point during the Winter season.
Many thanks with the confirmation and suggestions. Considering the fact that every thing is dry this time of year and the house was lately tented for termites, I'll insulate via the beam and seal up the plain air entryways. At the time I'm able to see within I feel I'll have a greater concept just how much moisture is in there over the years.
Why not only get it done right moreover Make with pressure handled roof sheathing. Even standard plywood can deal with wetting cycles again and again over our number 1 Tremendous cheap OSB.
I have insulated the edges with R-19 fiberglass and now I'm wanting to know: was that a mistake? It's craft paper and I was arranging over a plastic sheet in addition, must I skip that?