8" insulation in a 6" wall

[Fornax]

Originally Posted by workaholic

Sorry I have been away for a while.

/grin Only like 20 hours, that is not long, don't worry.

So you are in fact building your wife's mother a nice bungalow to live in for the next decades.

I guess this is a very interesting project for the regular contributors here, and many will have good advice on many aspects of the build. I can't say much about your walls and the vaporbariers, I'll leave that to other people.
To me it sounds like you did well with the floor. I understand there is no crawlspace, you checked and found the concrete slab to be dry, and insulated it from the inside, sounds good.

Can you provide us with measurements of the livingspace? Total surface, a floorplan? (Make a drawing on paper and take a picture : -) That will help us to get a general picture.

So far you are doing a good job at sealing the place, keeping moist away from where you don't want it, but now you have to pay attention to ventilation. You mentioned a "90% gas furnace", is that referring to a not so modern central heating device (90% efficiency but working fine so reuse it), where does it aquire it's fresh air from? (dedicated outside-air inlet or from the room it's in?)