Can you put EPS rigid insulation under vinyl siding with no wall insulation?
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是否可以在没有墙体保温的乙烯基墙板下放置1英寸的EPS ?
Roger Smith
Nov. 12, 2019Last updated: Aug. 26, 2020
We have a cabin in the Bershires of Massachusetts ceilings and floor have been insulated, dense pack celluose in ceilings 4 in Amivic graphite EPS under floors.
Walls have no insulation, siding is T-1-11 from the sixties would like to put 1 inch EPS under vinyl siding. the building is pretty well built. no sagging parts no gaps no structural issues, drywall in good shape. would the 1 inch EPS under vinyl siding be a problem with condensation on inside of walls would vapor barrie paint help over the old paint. What type of house wrap and where do you put it under EPS or over EPS.
Roger and Judy Smith
看起来你花了很多精力和费用来隔离房子的其他部分，所以你当然应该做墙壁，但我想知道为什么只有1英寸?在马萨诸塞州的伯克郡，你可能在气候5A区，这无论如何都不是北极，但你肯定会受益于R4多一英寸。
And I say that largely because its a lot of effort to remove and replace siding to insulate and seems a wasted opportunity to not shoot for more R value than that. I would point you to this page before you make a final call on the amount :
绿色住宅建筑需要多少绝缘材料?
I would certainly propose more insulation, and to specifically answer your question about vapor – yes, adding vapor impermeable materials to the outside of a wall assembly can cause problems during the cold season. But, the vapor permeability of EPS could be used to your advantage in this case – 1 inch may be a problem, but several inches may solve your problem as it can begin to act like a SIP wall (structural insulated panel). EPS begins to act like a vapor barrier at 2 inches as it is then approximately 1 US Perm.
话虽如此，我还是会考虑再加几英寸，如果你能把它甩出去的话，有可能吗?如果是这样，让我们知道，有一些方法可以让你去做。
Thanks Mike
I was thinking the same thing I did the ceiling and floors with decent insulation coverage.
I was tring to cheap out on the process but I may retire here so I should do it right the first time. dense pack the walls and 1 inch EPS under siding to solve the thermal bridgeing issue.
Adding more EPS would be an issue for the fairly new front door and the new rather large pictue window in the front might look a bit funny if the siding is way out past the window.
I am replacing the other windows so they are not a problem to shim out.
I doubt condensation in walls would be an issue with this plan
Roger and Judy
我会考虑选择不同的壁板材料或不同类型的绝缘材料。在加拿大抵押和住房公司的不相容建筑材料研究报告中，这些材料被列为不相容。乙烯基墙板具有很高的膨胀系数，而墙板在EPS绝缘材料上的膨胀(XPS也一样)可以引起穿过墙壁可以听到的吱吱声。为了解决这个问题，他们建议你在两种材料之间安装一层房屋保鲜膜;然而，如果是我，我会把其中一种材料换成其他的东西。
Hi Trevor
我想我会接受迈克的建议，在墙上做一个密集的包，因为我已经在天花板和地板上花了钱，可能还会在墙板下使用1英寸的EPS。
Thanks Roger and Judy
Thanks for your input Trevor, that was news to me about the sqeaking. As for the siding, Roger - given that you were in the middle of a reno, in my mind I had envisioned you already having the vinyl and 'reinstalling' it. Reusing exising vinyl is the only vinyl we would ever recommend, despite it being about as affordable and popular as siding can get. If you're buying new it's our least favorite given the ecological impact since40% of chlorine gas manufactured goes towards producing vinyl.
Since Trevor has broached the topic (Kudos to you Trevor), I'd second his motion to investigate other possible materials. Here is our page onSiding Types & Costs: Which is Best and How to Choose. For what it's worth, I have FSC painted wood on my house, which will require a coat of paint in the next 10 years or so, and if I could do it over again I'd be going withShou Sugi Ban Carbonized Wood, if nothing else but for the look.
Are you reinstalling old vinyl or buying it new Roger? I'm not going to take a rip out of you either way because people have budgets they need to stick to, but I may try to twist your arm a little to discuss options if you're open to it :)
I was going to install new vinyl siding primarily because I have some experience installing it , cost and fairly maintenance free also factor in. I also thought of going over the EPS with new T1-11 but the maintenance is an issue, as this may become the home I retire to do not want to repaint every few years. I know vinyl is not Eco friendly in the short term but the fact that it will not need to be painted over its life time may offset some of the unfriendly eco concerns, And the vinyl may become widly recyclable some day.
Thanks fo keeping me on the eco track
Roger and Judy
Just had to point it out in case, we don't like to preach but just open discussions. And who knows, It may well become recyclable, certainly reusable. Best to you both Roger and Judy, drop us a line for any other questions.