Strategies for internal rigid foam
Hi,
首先，感谢您在此网站上的所有好建议以及您愿意提供帮助的意愿。这是一个很棒的资源！
I have a brick on 4″ cinder block wall that I am looking to insulate from the interior. I am 95% sold on polyiso vs XPS due to the higher R value and the fact that it is mounted on an interior wall and hopefully will not be subject to the reduced R value as temps drop. I have about 1.5″ with which to work due to plumbing code (toilet to sidewall)
Because I want to minimize the wood involved to the bare minimum, I am thinking of putting 1″ of polyiso against the wall, then 3/4″ furring strips over the 1″ and securing through the foam with tapcons. Then filling the gaps with 1/2″ polyiso. I am not sure of two things:
- 随着polyiso的增厚，增加的R值会在这里实现（不确定是否需要一块实心）
- 额外的箔层会引起问题吗？
Finally, does anyone have experience with thinner than usual drywall covering rigid foam? If I can get away with 1/4″ drywall with no adverse effects I would consider it. Hoping that the foam can provide a bit of support but also worried that it may create waves. It is not a long wall however.
再次感谢！
GBA Detail Library
由气候和房屋部分组织的一千个建筑细节的集合
答复
G.S.，
如果您想用刚性泡沫填充3/4英寸毛茸茸的条之间的区域，为什么不使用3/4英寸厚的polyiso代替1/2” polyiso？这是指向3/4“ polyiso的供应商的链接：
https://www.menards.com/main/building-materials/insulation/panels/3-4-foil-face-face-face-face--insulation-panel/p-14444444444444444444444444444444444444444442A7A82A82A84CC7ADB6AA7272727272721.APP19.CAP19.CAP19.CAP19.CAP19.CAP19.CAPINGLKLKLKLKLKLKLKLKAPCAP19.CAPICCOB
多层次的箔stac面临k-up will not cause any problems.
我从未安装过1/4英寸的石膏板。我想这会起作用，尤其是如果将石膏板粘合到共同平面基板的情况下。（这意味着您的刚性泡沫厚度必须等于毛茸茸的条带的厚度。）当您散布泥浆时，可以纠正干墙中的任何波动，假设您知道如何正确使用宽的干墙刀。
G.S.
I'd avoid 1/4" drywall. It's generally reserved for building up curves with multiple layers. Very fragile and hard to get the fasteners to countersink without tear through. !/4" drywall on furring, secured through foam to a CMU wall, will magnify any irregularities. You will end up using a lot more screws and mud.
The boards account for a quite small portion of a drywall quote. I'd be surprised if there was a noticeable difference in going with 1/4" on a job.
For the section behind the toilet and to a foot either side & above it, glue the 1" polyiso to the CMU with foam-board construction adhesive, and glue 1/2" drywall to the foam board.
Use 1x furring through-screwed to the CMU a few inches away from the toilet perimeter and then go higher-R around it, making it a small inset cove for the toilet rather than condemning the entire wall to a sub-code thermal performance.
What climate zone is this?
Thank you all.
Dana, it is zone 5 (So. Connecticut). If we are talking about a matter of fractional inches I'm hoping our local building inspector will look the other way in favor of better insulation. Especially given that this is an older house (1951) with upgraded-in-place plumbing. I thought of the cove as well as some other ideas like reframing the partition wall on the other side of the toilet to 2x2 construction, but I also have to fit a vanity in there. However there is a window and some other reasons like overall depth of the room which keep me from doing something like framing a regular 2x4 wall against the masonry.
Either way, is it a workable option to glue the entire length of the wal?l (drywall to foam). It is a roughly 10 x 7 wall (accounting for a soffit box @ ceiling)
If you make just 10 square feet of wall a continuous R6 + R-0.5 gypsum + R2 CMU+ brick= R8.5-9-ish whole wall it's the thermal equivalent of 3 square feet of code-min window, so making it a shallow cubby around the toilet isn't a big deal. But making the entire wall R6 would be a bigger deal.
To hit code-min type performance in zone 5 would take 2.5-3" of continuous layer of polyiso, which is a bit thinner than a 2x4 wall butted up against the CMU. Even 2" of polyiso would bring that up to R15-ish whole-wall, which is pretty close to current code min, slightly exceeds 1980s & '90s code-min type wall performance (eg. vinyl sided 2x6 / R19 construction), which was about R13-R14 whole-wall. Can you spare another inch?
墙板可以用4英寸的24英寸O.C.将墙板固定到CMU。避免有毛茸茸的层。使用5/8英寸的石膏使其保持平整并限制开裂。或者，您可以在泡沫24英寸O.C.中的DADO OUT OUT频道。对于某些1x4毛茸茸的毛茸茸，将毛茸茸的螺丝拧到CMU或用切割的3/4英寸泡沫在毛茸茸之间进行1英寸的层，但这是更多的工作和较低的性能。