DO NOT RAMSET!!! you will likely hit them. They are weaved around fairly close together. Glue the plates down with PL. This is what we do in cases like this. Usually we will go in and snap it all out and glue the plates down then come back a couple days later to frame it up.
I don't think there's any way to tell how deep they are unless you know the guy that put them in. I remember working on a condo with radiant floor heating and I was told the pipes were buried one inch. So any underlayment had to be glued down, not nailed or screwed.
Are you attaching partition walls? Do the walls all have something else they can nail to? If so, glue will probably be enough. But if you have to use nails, I would hire someone who installs those radiant floors to come out and see if he can locate them for you so you can miss them. Btw, I've always used 2 1/2" ramset nails for attaching a bottom plate to concrete, they shoot in a lot easier and seem to hold fine.
I personally would get in contact with the radiant floor guy, if these are exterior bearing walls I would rather install the sill gasket and nail (I'm assuming they're not because typically you'd have to have embedded anchors in the concrete) and I would assume that they left the piping far enough away from the exterior edges, but again I would double check. For interior non-load bearing, I agree with the rest, and just use PL to glue it down.
if we know theirs radiant going in we put down overpour plates first for all the walls meaning one plate down the sheathing. the plumber can then run his pipes in each room and the concrete guys can do their pour. we then come back in and nail down to the overpour plates.
if gluing we cut a every 3rd stud a little longer to ensure a good snug fit for the glue to grab the shoe
Typically on all the radiant floors I've had to deal with the tubing did not go out to the exterior walls.
I still didnt tapcon or ramest the exterior wall plates but usually the tubing is anywhere from 6"-12" in from exterior walls.
Youre main worry would be in the field of the rooms / party walls.
We frame everything up then the tubing guys come tube it and then the gypcrete guys come pour it. We put 2x2 down whereever theres hard wood. This means no worries on broken pipes beat up gyp. Also allows us to put backing down everywhere for cabniets carpet tack strip floor plugs or anything else.
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