Hello,

We are installing a radiant floor over a heated area. My question is, for Seattle area with mild winters, do we need to use heat transfer plates with the pex tubing? The house is old with no insulation in the walls, but plenty in the attic. To be truthful, the house is about 1,200 sq. ft and installing plates with the pex would cost about $4,500! That's a huge percentage of the system cost. I have not done a btu calculation on the house, but just would like to know in general if old houses in Seattle climate need heat plates.
Thank you,
Darrell

to answer that question it would be good th know what the loads are for each zone. a room by room heatloss calc and design would spell this out.

You may not need plates in all areas, or not at all, depending on the heat loads for the rooms. Crunch some numbers.

hr

think ceiling

as HR says, it depends. Your situation sounds like it probably would require plates with no insulation. Of course, you could instead install some insulation, which would be great!

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