We system to convert to an improperly vented cathedral ceiling to an unvented 1. Sealing up the soffit vents is usually a no-brainer. What's The ultimate way to handle the ridge vent? Many thanks!
OK, I had been figuring that the entire on the rigid foam + cellulose needed to be a particular R-worth together and had been pondering working with significantly less rigid foam. I've been looking at about distinctive varieties of cellulose. Considering the fact that I am setting up from earlier mentioned would some thing like stabilized cellulose work since it has just a little drinking water included?
1. You ought to get an engineer to evaluate the protection of the 2x4 rafters. "Furring down with 2x2s" isn't going to Enhance the potential of one's 2x4s to bear the snow load. It is attainable that an engineer will recommend you to definitely sister 2x8s or 2x10s onto your existing 2x4 rafters.
By Martin Holladay
If you favor, you'll be able to Find your air flow channels on top of the roof sheathing instead of underneath the roof sheathing. If you choose to make this happen, make sure that any roofing underlayment that you install over the roof sheathing is vapor-permeable — such as, #15 asphalt felt, VaproShield SlopeShield, or Solitex Mento — Which your neighborhood developing department accepts this approach to roof venting.
I've a 50 calendar year-previous seasonal cottage in a very northern local climate. The easy six/twelve gable roof is made up of actual 2x6 rafters (24" oc), sheathed with one/two" plywood and covered with asphalt shingles. There is not any insulation during the ceiling and I believe minimal to no powerful insulation from the 2x4 partitions. In the summer the heat get inside of can make residing Virtually unbearable. I think that the biggest bang with the buck could be to handle the ceiling insulation challenge initially, but wish to sustain the inside overall look.
It is just a code violation to set up an air-permeable insulation like fiberglass batts involving unvented rafters. It's also a bad thought, mainly because dampness can accumulate in your roof sheathing if you are trying this technique, and you may end up getting sheathing rot.
Be sure to install insulation that provides at the very least the minimum code necessity for ceiling R-benefit. Insulation that exceeds the minimum amount code need is even better.
(d) There might be more than enough see this here air leakage on the "soffit" and ridge to supply air flow that functions how a ventilation hole ordinarily would.
I have constructed dense-packed unventilated roof assemblies a number of occasions without problem. Certainly I have not torn into them both. I would want to see far more samples of failures in these kinds of assemblies should they're around.
I am opening up my home and setting up cathedral ceilings, I just desired to substantiate my strategy because I bought second ideas examining Increasingly more over it. My unique conclusion was to go with a vented roof process and R38C batts. I read through lots about the different approaches and it continue to appears to me that this is the best. Livint in Atlanta GA We now have to manage both scorching humid summers and cold winters, so humidity Management is a difficulty, That is why I feel the vented solution is the greatest. Anyhow, I am all the way down to the rafters and roofdecking and furred out the prevailing 2x6 with 6" metallic studs, so I've about 11.5" for insulation. Mt prepare was to make a constant ventilation under the roofdeck, my issue goes towards to implement baffles, xps board Construct baffles or insect display nailed at furring strips to allow to the airspace.
Having said that, if your local setting up inspector approves of the system, and When you've got loads of time on your arms, and you also are effective at performing a meticulous career of air sealing, it is possible to go ahead and try the Slice-and-cobble method.
four. Once you have R-20 or R-25 of rigid foam on top of your sheathing, you may safely and securely insulate below your sheathing with Just about any sort of insulation you need to use to provide your insulation as many as minimum amount code requirements.
I am a homeowner in Seattle. Have a very freshly-framed, vented cathedral ceiling to insulate. Straight bays, 2x12, 24" o/c. The current strategy is to implement batts of some variety within the bays, take treatment to air seal the inside area, prevent penetrations, air seal the vent channel also (bays fully sealed), double prime The within area for vapor resistance. I've a couple questions on baffling the vent channel: one. A number of the building specialists I'm dealing with feel the jury is still out on baffles and therefore are recommending leaving the batts open on the channel other than close to the vents, assuming the one-two" air channel is usually managed.