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We are looking to build a slab on grade, do we need radiant heat?
Posted by Scott Self
Sept. 21, 2020, 10:34 p.m.
Delivery: radiant, forced-air and decentralized
2 Responses
When building a slab on grade, EPS rigid foam insulation is the most common choice of insulation, for performance and cost. I wouldn’t go as far as saying you 'couldn't' use spray foam below a slab, but I’m not sure why you’d want to. Spray foam for sure has uses where it is the best choice by a long shot, but under a slab is not the place. On this page you can see what we like and don’t like about spray foam and why –
4th generation blowing agents for spray foam
如果你需要它作为一个蒸汽屏障,空气屏障,或绝缘困难的地区,如地下室的边缘搁栅或创建一个氡屏障在爬行空间,它是一个伟大的选择,但在大多数其他应用,当然与平板在等级上有更好的方法。当一个安装人员喷洒聚氨酯绝缘材料时,他们真的会根据经验来获得适当的深度,当然一个熟练的安装人员可以接近,但在某种程度上仍然是一个不平整的表面。这就意味着你的网格和网格椅不是在一个均匀的水平上,你的钢筋也不是,然后混凝土的厚度可能会相应地变化,所以你可能需要更多,或者在某些地方可能太薄。
The only reason I could even think of to use spray foam would be if you needed to maximize the R value in order to meet height restrictions for your build, but if your allowance is down to a couple of inches that’s cutting it pretty close!
All that said, there may be something I’m not thinking of and I’m curious, why were you thinking spray foam?