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Hydronic Radiant Heat - Retrofit Help Please
We were flooded by Sandy and are in the midst of repairs/remodeling.
The room in question is on slab. About six years ago, we had hydronic radiant heat installed for an oak floor. The contractor installed the pex tubing (1/2") between sleepers that consisted of 2x4 lumber. After the pex was installed, the cavities between the sleepers (where the pex is) were filled with a cement mix. With the installation of a wood floor, the contractor nailed ¾ plywood to the sleepers and the oak floor was nailed into the plywood. We lived with it for 6 years. The heat did not work very well in that room, too much wood to get through. The adjoining room (tiled kitchen with radiant) was far more comfortable.
Long story short, flood ruined wood floor. We have now removed the oak floor and plywood, exposing the sleepers and concrete in which the pex tubing is encased. We are going with porcelain tile instead of another oak floor.
Here lies the question. If my tile guy pours 1.5 inches of mud on top of the existing base (which is the sleepers, mud and pex) will the heat make it to my tile floor? I am concerned because the pex is already in 3.75 +/- inches of concrete. Is adding another 1.5” plus the thickness of the tile going to make the system less effective (or not effective at all)?? The reason for going with tile instead of another wood floor is to get better heat in that room.
Any input would be appreciated! The photo attached displays the floor as is, the tile guy would pour the mud on top of this floor.