You are not the only real particular person using this type of concern. For many who (like you) are worried about the issue, There's two decisions:
Doug I agree, too many wrongs "overthinking" and overdoing. I when needed to resupply a physician setting up an aircraft with dozens of AN plane bolts simply because they were being tightened to the point of breaking the bolts. Considerably less is more in some cases... Together with the KISS rule.
I've a series of queries that integrate many of the topics you have coated in these content, but I am trying to use them in the retrofit problem. We are focusing on upgrading the Vitality efficiency, like added/updating insulation, for our Just about a hundred year previous 2-one/two Tale balloon body property (stucco around lathe exterior).
Therefore the dilemma is: seal the stucco vents and increase the spray foam roof and Don't be concerned about condensation? There may be very little low-hanging fruit within our form of construction, especially on current properties, Which is the reason individuals are being sucked into your spray foam roof rip-off.
I believe you should submit a sketch. I am unable to visualize what you're referring to from a description. If you would like set up an HRV with your attic, How come you should install a waterproof stucco roof over some sort of EPS box? Just isn't your attic presently dry? Most attics have roofs.
Electricity codes build minimum amount R-price demands for roofs and ceilings. There are plenty of attainable code compliance paths; most builders choose the prescriptive path, which sets forth minimal R-values for roofs and ceilings in a prescriptive desk.
I'm not a fan of whole peel-and-adhere roofs, for a number of explanations. But your system will probably be great. Just Guantee that your roof sheathing is dry within the working day you put in spray polyurethane foam -- since the sheathing won't be drying a great deal in either route soon after It truly is encapsulated involving peel-and-stick membrane and spray foam.
Certainly, you'll still have thermal bridging with the rafters. But you will not have any humidity difficulties.
I am knowledgeable about that strategy and also have utilized it on previous double walls with flat ceiling/ truss roof assemblies. Worked beautifully.
The R worth of your Slash'n'cobbled foam + exterior foam should be not less than forty% of the middle-cavity R price for dew stage control with the foam/fiber boundary in zone five. If It truly is arising a tiny bit shy of that before adding the exterior foam it's actually not a big deal in the short-term, but when it is going to be 5-a decade ahead of re-roofing to boost the foam-R to higher than 40% of the whole It is really really worth working with vapor barrier latex primer around the gypsum board, or a wise vapor retarder involving the gypsum board & fiberglass.
I've a partial cathedral ceiling from the completed attic of my dwelling in zone four (TN). Every single slope in the roof is split around in thirds by three different scenarios: knee partitions in the outer thirds, "cathedral" ceiling in the center thirds, plus a vented "attic" in click over here the middle third using a ridge vent - a typical scenario with completed attics, a minimum of all over listed here. I've a large dilemma in the summer with overheating. The insulation just isn't Functioning very well because it was badly insulated with just R-19 fiberglass batts among the rafters with no ventilation baffle or sufficient soffit venting and only r-19 blown into your "attic House". Also, my upstairs HVAC ducts are run while in the actually very hot "attic" Place beneath the ridge. According to what i haved acquired from various content articles listed here, my planned Resolution should be to cathedralize the entire roof, eave to ridge: set up continous air-restricted web-site-created 2" vent channels making use of foil-faced polyiso board (as suggested in ), setting up continuous soffit vents to considerably Increase the airflow from soffit to ridge, producing an air-limited ceiling under the rafters, and, most importantly, convey the ductwork In the conditioned envelope.
For your roof assembly more than the cathedral ceiling, does the stack-up below seize all the elements I would want? 2x8 pine T&G (presently set up, continues to be as being the finish ceiling)
So a hybrid technique has he said to be investigated. Dense packed cathedrals with warmside ridged foam to add R, taped, no recessed lights or other air paths then belt and suspenders... Increase venting While there isn't a ordinary one" vent route.
Recall: if you choose to setup rigid foam go now on top of your roof sheathing, don’t put in ventilation channels beneath the roof sheathing; both of these tactics are incompatible.