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Subfloor thickness and radiant staple-up retrofit
Long-time lurker, first time poster. We are in the process of planning a switch from an ancient oil-fired FHA to a modern NG mod-con boiler with indirect for DHW. We live in a very old (late 1800s) 1200+/- sq. ft. 1.5 story house in Maine. Given our small size, we're trying to decide between copper-fin baseboard, flat panel radiators, or stapling up radiant with aluminum plates. We have current access to the underside of each floor due to an unrelated remodeling project (rewiring). We're planning on a temp of 130 degrees from the new boiler. We are working with a professional licensed heating contractor who has indicated some external opinions on radiant might be warranted before we proceed. Our install is planned to begin this spring after the end of the current heating season.
Retrofitting radiant would be a great solution for us in regards to furniture placement in our small house. However, I'm concerned about the thickness of our subfloor. Our old house has two layers of 1" rough sawn pine for subfloor, which is then topped by 3/4" hardwood flooring (maple, if it matters). That makes for 2.75" of flooring. Is this too thick for a radiant staple-up retrofit?
I'm curious if anyone here has some experience or opinions on this. Thanks in advance for any comments.