Trying to achieve Energy Star in an existing home
We are putting a small addition on the rear of a home and adding a second floor. We are reusing the entire floor system and subfloor which is diagonal 1×6. We are reusing about 75% of the exterior walls which are 2×4 with blackboard (or gyp board as it is called around here) and an existing brick veneer. The second floor and addition are obviously all new walls and floors – all roof is new. We are trying to seal the house up to achieve Energy Star. We are concerned that we may not be able to achieve this with all of the gaps in the existing floor. To offset the leakiness of the existing floors and to a lesser extent walls, we are planning on trying to make it up on the new areas and use the ADA.
We are thinking in order to seal the gaps in the subfloor we can use some type of housewrap, tape the seams and seal to the sole plates. Any suggestions on a particular product here. Do we think we can get decent results with this? The floor finish will be mostly hardwoods with some tile and carpet.
We are using fiberglass insulation so plan on air sealing at both the exterior sheathing and the interior at the Sheetrock. Any suggestions on a good product to use as our gaskets at top/bottom plates and around HVAC boots, etc.?
Due to budget constraints out of our control, doing a closed crawl and/or spray foam is not an option on this project. A few other random details – hot/humid, NC, traditional vented attic so our air barrier is at the ceiling, blown in fiberglass in ceiling, kraft faced batts in walls and floor system.
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