Infloor substrate question

Pat Regan

An overpour I think may be too heavy in this case. I did a rough calculation of 11,000 lbs without water. The Quick track would not give me enough height in this case. I also have a full woodworking shop on the property. I am also a fairly long distance to a supplier.

Pat Regan

infloor radiant base

Brief summarary. I have a 25 Kw electric boiler with an older woodfired boiler ( the furnace works ) I put on an addition with a run of PEX in a slab on the lower floor. This slab meets another room and the subfloor level of this room is 1 1/4" lower in elevation. My thought was that I could use a product like Gypcrete or Levelrock and put a run of radiant heat in it. The problem is that of expense. This is only a 200 sq ft room. Level rock works out to about 2 grand and I have to make a 5 hr round trip to get it.

My question would this be enough mass? The current plan is to use a layer of 5/8" ply base then run a Pex on 8" centers and use a Cement type board in between the runs and FLextile the piping in the runs. There is 1/2 " slate tiles for the top. Would reflective plates also be in order?

My other thought was to try and lighten up regular cement with Vermiculite. I did a calculation in premix concrete and it works out to about 11,000 pounds a bit much for 2 * 8" on a 8 ft span. ( no I haven't talked to an engineer )

Thanks in advance

Wethead7

leveling

Why not use pea gravel concrete in an overpour. Anchor down the 1/2 inch tubing an you should be ready to go with the over pour.


Mike

Jim Prisby

Suggestion

Based on a system that installs on top of the sub-floor. I would recommend you checking out Quik Trak (1/2" plywood/aluminum panel system) by Wirsbo(www.wirsbo.com).

Jim Prisby