three. Employing ongoing Ice & Water Shield is typically dangerous, but it's OK if you are pursuing the PERSIST tactic and putting your whole insulation on the skin from the peel-and-stick. The method can operate, but you require far more foam on the exterior of your roof.
Can we (does the code make it possible for it)? Does it make useful sense? Are there pitfalls on account of our local weather? How could Now we have to switch that to suit it to out predicament?
We really Do not know if these roofs have suitable vent channels, or what sort of vent baffles (if any) were employed to take care of the ventilation hole between the very best from the fiberglass insulation and also the underside with the roof sheathing.
Will you be contemplating the 'flat' vented cavities will not supply the assembly with the exhaust path for humidity?
I think that most contractors would be concerned about the buildability of your solution. The Photograph demonstrates a very low-slope roof above a flat ceiling; this allows workers to face about the ceiling joists.
I'm developing a forensic laboratory built in Massachusetts, and am possessing a difficult time reconciling applicable making code with my study of the literature pertaining to insulation and roof deck condensation.
Could you make sure you give a detail of earlier mentioned sheathing air flow utilizing a continual Ice&Drinking water membrane, and steel roofing to get a mixed local weather? Thank you
The more time which you wait to setup rigid foam above your roof sheathing right after your rafter bays are stuffed with fluffy insulation, the larger the chance that your roof sheathing will accumulate humidity. 1 or 2 several years needs to be no difficulty, but I wouldn't stretch the workout Substantially farther than that.
I doubt the condensation is happening versus the cold ridge beam. Alternatively, I do think it is probably going that condensation is going on to the underside of one's ridge shingles or maybe the underside on the asphalt felt underlayment.
You're proposing an unconventional method of insulating your roof. If I realize you appropriately, you intend to install EPS amongst the tops of your respective roof trusses plus your roof sheathing.
Martin, many thanks. I just talked towards the roofer and he turned down the concept of only putting the foam in excess of the loved ones home cathedral ceiling. That Bizarre "jog" within the roofline, obtaining it quickly bump up four" or eight" where by the loved ones space starts, in the midst of the again aspect in the roof, would defeat the thought of a steady slope for rain to come down when it hits the upper Section of that back again roof. So the 4" or 8" peak addition demands to carry on over the total second Tale roof line.
Thank you, Martin and Stephen. Luckily we're within a circumstance in which we can easily pause and rethink, as the new felt has long been positioned, Nevertheless they have not begun putting in shingles however. I will talk about the problem Together with the contractor yet again. I may be able to get him to rethink.
Whilst vented roof assemblies are intended to dry to the exterior, unvented roof assemblies are created to dry to the inside. That’s why an unvented roof assembly must never ever incorporate interior polyethylene.
I now know that stucco cannot be placed on a roof, so I'll revert for the a metal roof, but still want to get an unvented attic. I have read through by means of "Making a conditioned attic", and am still not sure concerning the best way Go Here to continue.