Placement of vapor retarder for radiant heat in slab
I’m building a small house (~ 1000 sq. ft.) on a full foundation and am having radiant heat tubing installed in the slab. The plumbing contractor plans to staple the tubing to the foam insulation under the slab. I had planned to put the foam over crushed stone then a 10 mil sheeting over then the slab on that as I’ve seen in numerous foundation diagrams. But if the plastic sheeting is over the foam the staples for the radiant tubing will poke many holes in it so that seems like a bad idea. Would it be OK to put the plastic sheeting on the crushed stone then the foam and pour the slab on top of the foam. That way the vapor barrier wouldn’t have all the staples going through it? Thanks for your thoughts on this.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part