I-Joists, Fiberglass Batts, Joist Trak and Energy Star Checklist
I'm about to break ground on a 1.5 story, 2100 sf Cape Cod house on Cape Cod (lots of knee-walls). The first floor is to be heated with Wirsbo Joist Trak. Also, the large room over the garage will have an insulated floor to allow for future conditioned space(mini-split). The house will use 11 7/8 I-Joists exclusively due to the open concept design and all floor surfaces above I-Joists will be glue and screw 3/4 plywood. My building code requires I use/meet the energy star checklist.
Now for the tough stuff; my wife insisted I sell my motorcycle, use a 4 point harness when I paint my 2-decker, and spray in (foam) won't be used (substantially) in the house.
My questions are/quandary is:
1. How to achieve Energy Star compliance for sub-floor insulation contact when a small air gap for extruded heat transfer plates promotes even floor surface heat? (current design call for R-30 9 1/2" un-faced fiberglass batts with rim plates insulated under the 1st floor)
2. How to achieve sub-floor insulation contact compliance while using 12" R-38 un-faced fiberglass batts in the garage/under knee wall ceilings; can an insulation installer get sufficient fit with 15" or 16" x 12" in the plenum formed by 11 7/8 I-Joists 16" on center for a 25' x 35' ceiling?
I'm afraid there was some misunderstanding with the HERS rater plan review during the permitting stage; he figured I would change the design during the build phase.
Oh, and increased cost is an issue...Does anyone have a winning lottery ticket they want to sell cheap?
Posted Aug 13, 2014 9:01 PM ET
Edited Aug 13, 2014 9:19 PM ET
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