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AND it is likely another wall was built ON TOP of the tile, so (sandwich)....another reason I dont want to get into removing the tile and getting into that potential issue.
Look up a product called synthetic cork. It is an insulator that you can put on top of the tile and under the mesh heating.
In terms of on top of that we have Tarkett Fiberfloor. It is a rolled fiberglass like floor that can be loose laid. We got it at Lowes. We have radiant heat and just put it in a bathroom to test it out. Really love that it is in one piece (easy to clean) and a bit soft underfoot. Was very easy to work with for laying outselves.
The pattern Lowes had is a dark slate look tile. It hides dirt well and will not discolor in sunlight or with the heat.
Having an insulation crew spray closed cell foam into the floor joists is the best solution. The highest R-value and it completely seals it both from air leaks and moisture.
Appreciate the suggestion, but there is no access to the area under the floor. Even though I said crawl space, it has all been sealed off. [Concrete block and mortar. Not something I did....but something I have to accept.] And the outside walls are brick...which I dont want to disturb.....106 year old house.
Although I call the area a sunroom now....it was part of a wrap around porch but was enclosed as part of an addition which occurred in 1917. Obviously we dont do things that way any more.,
Never raise the flooring surface temperature setting above 85 degrees F.
It is important to note that when laminate is used over a radiant heating system, minor gapping can occur and should be expected. Maintaining consistent relative humidity levels will help to minimize this occurrence. Seasonal changes can also have the same effect on laminate, so temperature and humidity controls should always be monitored to ensure the best performance.
Electric systems are typically supplemental, not meant to be the sole heat source for a room. The cables, which are often pre-attached to mats for ease of installation, are installed over the subfloor in a bed of thin-set mortar. Ceramic or stone tile are popular finished floor choices. ... Electric radiant floor heating costs about $6 per sq. ft. for materials but is often less expensive to install because of lower labor costs. Unfortunately, it’s far more costly to operate and therefore generally makes sense as a supplemental, not primary, heat source
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