Is spray foam a good way to insulate a house from the exterior?
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Is spray foam a good way to insulate a house from the exterior?
Hi,
I have found this site very helpful - very appreciative to the experts who take the time to share their knowledge.
We need to replace the siding on our house. We will likely replace with a Hardie Board board and batten rain screen. However, the contractor can also remove the sheathing down to the studs and reinsulate first.
He reccomends 2lb closed cell spray foam in between the studs (applied from the outside). I guess this will spray to the back of our interior drywall.
I have no idea if we have an existing vapor barrier behind our drywall but doubt it - this is an older wood framed bungalow.
In addition, i dont expect our interior drywall forms a very great air barrier either - we have the usual holes from outlets etc but we have a lot of windows and other installations - all done seemingly DIY so I have no idea if they are well sealed to the interior drywall.
After research on this site and others, it seems that spray foam is the best way to go, as it will provide a vapor / air barrier in addition to insulation. I don't really like the potential for harmful offgassing, but because we will not remove our interior drywall, I don't really know how we can air seal / vapor seal behind the drywall - this seems neccesary for other types of insulation.
有人有从外墙重新隔热的经验吗(所以在螺柱之间，但从外面)?是否建议使用喷雾泡沫，还是我遗漏了什么?
Any help is grately appreciated!
Simon
Spray foam in this case will provide everything you are looking for – insulation, air barrier and vapor barrier. And you are wise to consider the toxicity of it, spray foam has until recently been among the most harmful types of insulation in terms of greenhouse gas emissions. But there are a couple of companies who have switched tonew blowing agents that are much safer, you can find them in this page –
New blowing agents for spray foam insulation don't cause climate change
在这种情况下，我会使用喷雾泡沫，我唯一会建议的是，如果你对化学物质敏感，在安装它之前，首先检查一下是否可以得到它的样本进行气味测试。从我们所了解到的情况来看，它比传统的喷雾泡沫毒性更小，这是很好的，但一旦使用，如果你受不了气味，你就无法去除它。这并不是说它将永远渗透，但肯定在它完成后的头几天或几周你可能会注意到它。
And here is our page onthe best way to insulate walls from the outside，这也会给你一些有价值的建议。我认为你应该记住的另一点是墙和屋顶之间的连接处。它们可能是棘手的，因为许多老平房的屋顶线很低，使它很难很好地隔热，同时仍然允许通风。This page will tell you how -What causes ice dams and how to fix them. Hope that helps Simon, let us know if you have more questions.