Was just wondering if any of you guys have wired houses made with these fabricated blocks of styrofoam that are stacked up and filled with concrete. I have been asked to wire one for a client and have not done one like it before. The walls are all up so no chance of getting anything in the concrete, but, the foam is a couple inches thick. Floors are TJs, with exposed timber framing for the upper ceiling, with plenty of access from below. Will be using metal boxes and romex where I can. Questions are: whether any AHJs ask for additional protection for the romex between the "studs" in the foam, and if any body has any tips.
One manufacturer of this type of construction is the RASTRA prefab method . Their site includes this detail of electrical installation. Note that the face of this manufacturer's prefab panel can be notched deeply enough to get the 1¼" clear space for NM.
Thanks guys. I am aware of the requirements, I have a video explaining the procedures, and I have talked to the AHJ for the area and he agrees with you(us). I was more interested in any tricks of the trade, so to speak. Like if there are any supports unique to this type of installation, routing secrets, etc. Most of my training is industrial and large commercial, the last three years on my own has gotten me into more residential than I can stand. Again, Thanks
Re: Foam Block houses#21778 02/11/0311:52 AM02/11/0311:52 AM
Yep, these concrete blocks are quite common here. The stuff is called "Ytong" here. Much easier to put up than bricks (the blocks are much bigger and lighter than bricks, plus they're absolutely square, requiring only few mortar and a thin layer of spackling compound instead of plaster. They're building entire houses with these blocks, I just used it to put up a new interior wall. Much tougher than sheetrock, try kicking a hole into a 2 or 3" solid block wall. Though some people say these walls tend to set and crack after some time.