XPS fastening to concrete walls
I've got a 12 year old colonial with poured concrete foundation walls. I can already tell the walls aren't square and am not thrilled with the thought of using adhesive...
So, which of these would you recommend:
A. 1/4" Tapcons with washers
B. 1/2" x 3 3/4" concrete wedge anchors
Keep in mind that I have a hammer drill but it is a big old Milwaukee with 1/2" bits, so I'd most likely have to purchase a different (smaller) hammer drill just to use the tapcons. With the drill that I have I can install the wedge anchors no problem. Wedges are double the price but I won't need to buy another drill...
My concern is with the heat/cold conductivity of the larger anchor, could that cause any issues?
I'm thinking of anchoring each 4'x8' sheet of XPS with 2 anchors (midpoint at 2' and 6' up) then framing a wall up tight against it. Once I plum the wall I'll use wedges as needed to keep pressure on the XPS.
Any thoughts or recommendations???