|Taking shape: the roof is on!|
We laid a sheet of plastic over the top of the wall and under the wood top plate on which the roof trusses sit. This sheet is taped to the exterior face of the ICF form and to the plywood diaphragm that we attached to the bottom of the trusses. All the seams in the plywood diaphragm will be taped with Siga tape, and plumbing and electrical penetrations will be sealed with Roflex gaskets we got from 475 High Performance Building Supply. It's great having these suppliers in the US!
|This plastic gets taped to interior ceiling and exterior face of ICF|
Instead of holding up interior framing until the entire ceiling air barrier was taped, the builders simply taped seams that were to be crossed by interior walls.
|Air sealing at ceiling/wall and window/wall|
|Look closely and you'll see the stitches of tape where walls pass under air barrier seams|
And speaking of air barriers--this is how we dealt with the slab: our radon barrier is our air barrier, so we used Stego Wrap since it's tough; utility penetrations are taped off to it, and it in turn is taped to the inside face of the ICF form.
|StegoWrap radon/air barrier taped to interior face of ICF|