Putting a gas line in cement slab
I've done a little research on putting a gas line in a poured concrete slab, and codes require that gas pipe must be enclosed in a larger pipe that vents outside. Since your slab is already in place and the groove will be bridged over with the wood flooring, your architect's recommendation seems reasonable, but I'd still run it by your code enforcement department. I'd just want to make sure the flooring was running perpendicular to the groove. I'm assuming you've already addressed the challenges of putting hardwood over a slab.
However, gouging a two inch deep slot in a poured concrete floor is NOT a trivial task. I used a concrete blade in my circular saw to cut a few 1/2" grooves for drainage in my garage floor, and it was a challenge. It was slow going and created massive amounts of concrete dust that went everywhere. You'll need to cut multiple grooves close together (1/8"?) then wail away at it with a chisel. Even then, the narrow strips won't always break off at the bottom of the groove and you'll be stuck chipping by hand. Also consider that you'll be creating an expansion joint in your slab, and if a crack forms in the slot you've cut, that crack is likely to extend beyond the end of your slot.
I'd probably go see my local tool rental place and see if they had something with a bit more horsepower...
Last edited by houseinthewoods; 03-26-2010 at 11:21 AM.