In Floor Radiant Heat

[Cartw1]

Hi all, new here and appreciate any feedback!
I am set to constuct my garage. It has been a long haul with applications for a minor variance, permits, bank financing etc...but tomorrow the concrete contractor arrives.

I have some ?'s re: in floor heating

a little info: the garage will be a 20x30' Gambrel Roof, 2 story with full poured footings, 8" poured walls and 4" slab floor. I live in Ontario, Canada so a building with proper footings and foundation is desirable due to freeze/thaw cycle and structural integrity.

I have decided to install 1/2" pex line, heated water, in floor radiant heat system. The local Home depot offers a product from "Plasti-Fab" which is a 2 1/2" rigid foam board with foil on one side and grooves cut in to place your pex. After that, the pex is stapled in, covered with wire mesh and the cement poured over that.

That is the extent of my understanding. have any of you constructed with this type of materials? any comments or suggestions..I would really appreciate it

Thanks again,

Jay

[Racecarl]

I think placing the PEX in the grooves would hinder the heat transfer. According to what I have read the PEX tubing needs to be completely surrounded by concrete to effectively transfer heat.