Lee Kinser
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- Dec 2, 2023
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Our master bathroom is built directly over an unconditioned space, the back porch, and gets absolutely freezing in the winter with huge deltas between ambient interior temps and the floor temps. The builder originally did not insulate the space below the floor at all, but upon request they added R-30 insulation between the bottom of the floor and the PVC soffit ceiling of the porch.
Since this is still an issue, I'd like to take it a step farther and I'm looking for suggestions on how to best insulate this space. From looking around online, it would seem R-30 to completely fill the space and 2" foam board / sheathing under the joists to prevent bridging. Does this sound right? Is a moisture barrier also needed? Should the insulation be faced or unfaced? Should we use spray foam around the seams between foam boards, edges, and where the boards meet the joists?
And assuming all of that is accurate, any advice on how to reinstall soffit or switch to a wooden ceiling after this extra 2" of foam board is added?
Sorry for the bevvy of questions, just trying to fill in the gaps.
Since this is still an issue, I'd like to take it a step farther and I'm looking for suggestions on how to best insulate this space. From looking around online, it would seem R-30 to completely fill the space and 2" foam board / sheathing under the joists to prevent bridging. Does this sound right? Is a moisture barrier also needed? Should the insulation be faced or unfaced? Should we use spray foam around the seams between foam boards, edges, and where the boards meet the joists?
And assuming all of that is accurate, any advice on how to reinstall soffit or switch to a wooden ceiling after this extra 2" of foam board is added?
Sorry for the bevvy of questions, just trying to fill in the gaps.