Plumbing Under a Concrete Floor
Layout is critical when the pipes are cast in stone.
Synopsis: With a slab-on-grade foundation, there are no floor joists in which to run plumbing pipes. Everything must be buried in the dirt prior to pouring the concrete. This article details how to locate the pipes accurately, pitch them correctly, and backfill the excavation so the slab wont crack.
In slab-on-grade construction, a concrete slab serves as a floor (and at times the foundation) for the structure above. It is common throughout the Southwest because slab-on-grade construction is fast and strong, and because it offers a high thermal mass while being a potentially less expensive route than traditional woodfloor construction. Concrete is easy to tile over, and here in New Mexico, tile floors are king. Also, the advent of radiant heat and color-tinted concrete make a finished concrete floor an attractive, extremely durable alternative to traditional flooring.
With a slab-on-grade floor, there are no joists to house plumbing, so…