We have been not too long ago installing many closed mobile foam directly to the roof sheathing with excellent results. Even so I'm wondering When you have listened to about what comes about if the inescapable roof leak takes place?
to put in vent channels involving the very best of the rigid foam and the best layer of roof sheathing. I hardly ever said that it had been necessary
Could it be okay to incorporate peel-and-adhere membrane to pick out parts of the roof and continue to keep the rest breathable with tar paper?
My belief would be that the steep facet of a mansard roof is often a roof. This really is especially true if the exterior in the sloped assembly is concluded with roofing.
My home built in 63 here in Ohio includes a cathedral ceiling with no air flow. In actual fact there lots of cross-supports running perpendicular to the principle joists along with other framing factors that will make this unfeasible. So I need to make it a powerful unvented roof. Half of your roof has 2x8 joists and another fifty percent has 2x12s. Right now You will find a membrane covering (rubber) which is worked very well for more than twenty years but is showing signs of deterioration and might will need changing quickly. Having completed reworking on the inside and going for walks about the roof I realize that many the sheeting ought to get replaced together with the tiny insulation which is there now. We have had condensation difficulties prior to now so I now you will find air infiltration and bridging difficulties.
Martin, Thank you for your reply. All those posts are both really educational. I am getting the feeling that SIPs can be done effectively, but might be defeat in cost with exterior rigid foam systems when you've advisable, with equivalent or superior efficiency (with emphasis on air-tightness).
Martin, I am grateful for your time, and after looking through numerous of your replies, I am able to see you are passionate about developing issues right. Ideal for persons, as well as Earth. Thanks for Everything you do!! Ryan Nelson
Aside from inquiring you visitors for an evaluation of my plan, I have One more question brought about by problems expressed by an area builder. He is worried that after the AC ducts are Within the conditioned House that the ducts will likely be vulnerable to sweat and can drip all over my home furniture.
I question which the condensation is occurring from the cold ridge beam. Relatively, I feel it is probably going that condensation is happening around the underside within your ridge shingles or the underside of the asphalt felt underlayment.
How can this look for a program? Anything you should modify/insert/reorder? Does one concur with taping the seams in both levels of plywood?
Your assembly calls for about 5 inches of XPS, for a complete R-worth of only R-twenty five. That is not Significantly. In the event you are likely to all of that issues to create a complicated roof assembly, it is best to purpose larger.
Am i able to get some additional commentary over the "entire roof" of Ice & Drinking water Defend? I feel this had little or no to carry out Together with the failure. The main reason why I ask is I have an analogous "whole roof" structure developing, Having said that, the rafter bays are all straight operates with soffit vents, constant vent baffles (one/2" plywood) and continual ridge vent. Dense pack cellulose, two" XPS under 2x10's, air restricted drywall (XPS might be sealed up way too).
Thank you on your suggestions, Martin. Inexperienced Building Advisor continues to be the most effective for answering certain issues I have had in the basement each of the method to the roof. I would not have the capacity to build my own home solo similar to this without having you as well as other visitors helping me out with facts.
The home is at about four,500 ft. We only get about three' of snow a yr and it almost never stays about the roof for greater browse around this web-site than 7 days a couple periods a calendar year. I'm on an exceedingly tight finances, just wanting to make the put livable. Any recommendations are welcome.