I am building a small addition to the back of my house in Ontario. Excuse the crude drawing (best I could come up with). I am interested in finding out how to insulate and protect the crawl space. This space will have sides(not sure if its going to be lattice or PT boards - #2 on drawing). Either way,it will be partially exposed to the elements. In the photo attached, it shows the insulation I intend to use between the 16" centre joists. Covered with Comfortboard (#1 on my drawing). There would be vapour barrier on top of the joists,under the T&G sub floor) Im not sure if I should then cover the Comfortboard with thin PT plywood or perhaps Aluminum soffit ? I then want to make sure I can seal all the gaps and spaces (to prevent mice infiltration etc). Suggested method ? Is there any point in covering the crushed stone ground (#3 on drawing) with Poly sheet ?(or is this only beneficial in an enclosed,conditioned space?) Any benefit to cover the 6"x6" posts and 2"x10"(x3) beams with Comfortboard and PT plywood ? (to further prevent transference of cold)? Any assistance would be appreciated. [ATTACH]47547[/ATTACH] [ATTACH]47548[/ATTACH]

Hi all, I have a ~7 foot high basement wall which has a 5 inch indent about half way up. How do I frame this? Is there a way to make a ledge, or is it recommended to ignore that space and just do a standard vertical stud? Picture: [ATTACH]47676[/ATTACH]