We prepare to transform to an improperly vented cathedral ceiling to an unvented 1. Sealing up the soffit vents is usually a no-brainer. What is actually The ultimate way to deal with the ridge vent? Thanks!
Alright, I had been figuring that the overall on the rigid foam + cellulose needed to be a specific R-value in combination and were pondering making use of significantly less rigid foam. I have been studying about diverse forms of cellulose. Considering that I am setting up from over would something like stabilized cellulose operate as it has somewhat h2o included?
The Hazard is the fact interior humidity will migrate to the chilly sheathing, leading to condensation or dampness accumulation.
Builders resolve this problem by furring down or scabbing on added framing down below the rafters to deepen the rafter bays. One more procedure is so as to add a layer of cross-hatched 2x4s, sixteen inches on Middle, installed beneath the rafters."
I doubt the condensation is occurring against the cold ridge beam. Rather, I do think it is probably going that condensation is happening about the underside of your ridge shingles or even the underside of your asphalt felt underlayment.
I have a fifty 12 months-outdated seasonal cottage in the northern weather. The simple six/12 gable roof is made up of true 2x6 rafters (24" oc), sheathed with one/two" plywood and included with asphalt shingles. There is no insulation inside the ceiling and I think little to no powerful insulation during the 2x4 walls. In the summer the heat attain inside tends to make living Pretty much unbearable. I think that the most important bang with the buck would be to deal with the ceiling insulation issue initial, but want to preserve the inside physical appearance.
If you want to Merge air-permeable and air-impermeable insulation, There are 2 achievable tips on how to commence. A person solution (based on the code) requires: “As well as the air-permeable insulation mounted right down below the structural sheathing, rigid board or sheet insulation shall be mounted immediately higher than the structural roof sheathing as laid out in Desk R806.5 for condensation Regulate.â€
As mentioned over, we hope to switch the roof this following yr. If that's the case, at that time I might love to upgrade to possibly an unvented roof or if required a chilly roof (a vented about-roof). (I don;t realize that it matters while in the equations, but we are thinking about acquiring and installing stamped metal shingles.
(d) There might be enough air leakage within the "soffit" and ridge to offer air move that acts the best way a air flow gap ordinarily would.
This short article was very informative and appeared to important site give a great deal of recommendation on cathedral ceilings. But what what my fantastic storm? Your house is thirty yrs previous (eighty's) and im absolutely sure the ceiling is not air limited. I need to do anything this summer/slide to test to repair these leaks but I'm worried that whatsoever I do wont operate and may become a waste of money, In particular due to the fact I havent heard of a stable solution.
Thanks for finding the thread over...note that in write-up #17, Robert Riversong talks concerning the "vented about roof". I agree with you that this method deserves some notice for cathedral ceilings.
You describe your proposed air barrier as "taped felt." I do not Feel asphalt felt could be efficiently taped, and I don't believe that asphalt felt makes a very good air barrier.
The significant density fiberglass is so considerably more dense as opposed to medium and low density fiberglass that it looks as if it need to lessen the possible for convection inside the batts, but at two to three situations the cost of medium density fiberglass batts the achieve might be nominal and never well worth the extra cost. Thanks for sharing your knowledge,
Electricity codes set up bare minimum R-value necessities for roofs and ceilings. There are many achievable code compliance paths; most builders select the prescriptive route, which sets forth minimum R-values for roofs and ceilings in a prescriptive desk.