Building a house and using stable up pex in the joist spaces (actually spaces b/t web joists) under the subfloor. This is under our upper level, with conditioned space below on the mainfloor and below that with a finsihed basement. Both the main floor and basement have pex embedded in concrete.
My question is, will it be adequate to insulate b/t the joist spaces with R-11, leaving a 2-3" airspace under the tubing? Also, I bought craft faced (sp?) R-11, so do I put the paper down, toward the ceiling/conditioned space below? (I'm doing the insulation install to save $$$ rather than have the HVAC crew do it.) The finsihed floor above will be a mix of engineered wood and carpet with the special pad for radiant applications. We're using a gas high-efficiency boiler and my HVAC contractor says he will run the H20 at around 140 degrees.
My question is, will it be adequate to insulate b/t the joist spaces with R-11, leaving a 2-3" airspace under the tubing? Also, I bought craft faced (sp?) R-11, so do I put the paper down, toward the ceiling/conditioned space below? (I'm doing the insulation install to save $$$ rather than have the HVAC crew do it.) The finsihed floor above will be a mix of engineered wood and carpet with the special pad for radiant applications. We're using a gas high-efficiency boiler and my HVAC contractor says he will run the H20 at around 140 degrees.