Thorsten Chlupp is in a very Substantially tougher weather and he appears to be accomplishing fine with very simple free fill about the attic ground....not surprisingly He's making use of "sufficient" amounts (cellulose galore)and he has baffles near the soffit.
My experience is that the dew position profile would wind up while in the XPS foam board, that's why a VB ought to be put on initially deck. So as of assembly:
I think that Bill Rose is right: most of these failures include dampness that is carried by shifting air. These are not diffusion failures. If your rafter bays really are thoroughly dense-packed -- a major if -- the prospect of air motion is rather lower.
A. To make the most of the insulating price of the rigid foam in excess of the attic, you absolutely wish to seal up any attic vents, and you simply absolutely don't need to make a ridge vent.
November 18, 2011 Picture 1 of 3 A leaky ceiling doomed the roof sheathing. The ceiling of this 10-yr-previous house was Reduce for an electrical box, and also the oversized hole was never ever caulked. Moisture-laden air entered the rafter bays by way of these cracks. In the event the dampness encountered chilly roof sheathing, it condensed, leading to humidity accumulation and decay. (The rubberized membrane during the Photograph was applied as A short lived patch for a gap in the roof, and did not lead for the failure system.) Graphic Credit rating: Peter Yost A leaky ceiling doomed the roof sheathing. The ceiling of the 10-12 months-outdated home was Slash for an electrical box, as well as outsized gap was under no circumstances caulked. Moisture-laden air entered the rafter bays via these cracks.
Does it make sense to spray and Slash and cobble 4 inch shut mobile foam/board on underside of sheathing followed by fiberglass Within the bays and one inch of eps/iso under the rafter (to halt thermal bridging) prior to finishing with drywall? Will I develop a vapor sandwich and improved leave the ultimate EPS and accept the thermal bridging?
Do you know the first supply for this Photograph and if it is achievable to perspective other photos of this intriguing failure.
If We will place some insulation previously mentioned the ceiling, then I want to put All of the insulation previously mentioned the ceiling, and steer clear of the Value and trouble of a whole new reduced ceiling. Meaning a Make-up of eight", applying XPS. If we Establish up the roof line higher than the cathedral ceiling from the household space by eight", we presumably need to have to make up the rest of the adjoining gable roof too.
The roof seems to possess a layer of asphalt shingles around the sheathing that has a tin roof about that. The soffits are shut off. The house is way from the beaten route and It is really challenging to get any contractors on the market to work, let alone offer bids so I am practically alone.
As her explanation the home flexes with improvements of temperature It is doable, even very likely that a few of the foamed-in air sealing will leak. It would be value undertaking 2" of open mobile foam on the inside aspect of which might be a more adaptable and reliable long lasting air seal.
3. Working with continuous Ice & H2o Protect is usually risky, however it's OK if you are adhering to the PERSIST technique and putting your entire insulation on the outside of the peel-and-stick. The method can do the job, but you need a great deal more foam on the exterior of your respective roof.
Hi Everybody. I see I am just a little late to your celebration on this thread but I hope a person can content even now support me. From my matter line you may see I've pretty your house. I am the house operator and disappointed with my leaky roof. I reside in WI and my roof has asphalt shingles.
Certainly, you are going to nonetheless have thermal bridging throughout the rafters. But you will not have any dampness problems.
With my dwelling the middle section (20ft) is vaulted, a 3x12 slope and it has 8 recessed lights all through. I've experienced leaks in a lot of places In this particular section of your house, the leaks materialize Using the thaw and refreezing. It got The purpose very last yr where by I needed to shovel the whole roof soon after Each and every snow slide.