Underfloor heating, radiant tubes - what type of insulation?

Wayco Wayne_2

an internet job. Most of us would use 2 runs of 1/2 inch per joist and use transmission plates. However... if the job is already installed let's make the best of it. For a tubing only joist heating system you need an air space at the top of the insulation. 1.5 to 2 inches will work. The reason being you are heating the air beneath the floor, not the floor with this type of system. It is important to seal this air space because it takes very little air to lose your heat from the air space. I like to use a product called thermopan to block off and seal the air space, and then add batts, as much as the space will allow. It is also important to insulate the band board at the end of each joist. After all of that is done, I like to seal off the bottom of the joists with some insulated sheathing across the bottom of the joists. Depending on the type of exposure below and the floor covering R factor the heat can possibly run down the floor joists itself and escape through the bottom of the joists. Those rasclly btu's are sneaky little devils, and they need to be shown the way into your house. Good luck. If you havent bought materials yet consider doing it differently. 3/4 is hard to work with, and 1/2 bends so much easier. WW

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Howard_7

Underfloor heating, radiant tubes - what type of insulation?

Underfloor heating, radiant tubes - what type of insulation should I use between the floor joists? There is room for R-38, fiberglass. Should I use fiberglass, pink board, or reflective? Thanks! Howard

Alan(OnVacationInOregon)Forbes

Are you

using heat transmission plates or is the tubing running free in the joist bays?

Howard_7

The tube

is free in the joist bays. 3/4 inch.

kpc_26

3/4\"???

is that 1 tube per bay?