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I hope you didn't take offense to what I said or that I seemed condesending. I was just showing that it isn't R1.4 of total insulation value per "piece". I guess your ratings are based on R per unit of thickness, which then yes, XPS boards are much better. 3.5" of Roxul is roughly 8.9cm...

Well the void is so that the framing wood wouldn't be in direct contact with the concrete wall, but after writing my post, I realized I could still use the old EPS rigid insulation, thus not needing a void, the frame would be directly against it. Roxul Stone Wool Look at the Canadian...

The 1" EPS is against the basement concrete wall. The 2" frame is against the EPS. I plan on removing the 2" frame and replace with 2x4, but keeping the 1" EPS as a moisture retardant, if that's possible. Rigid XPS is a better insulator than rockwool per inch, correct. However, with 2x4...

Yeah I had something like that in mind too, basically a layer than lets air in/out. But what about the EPS boards already in place? Could I just put my new frame directly over the EPS boards instead?

I was recommended to use rockwool insulation (Roxul) for my basement wall insulation (exterior walls). Now I know my wall framing must be 1" from the concrete wall to let air circulate, but with that air gap I'm wondering what's the best way to put in the rockwool insulation without having it...

I'm redoing my basement completely and what used to be there was carpet glued to the concrete. I'll be putting laminate flooring. Now I found two materials I can put to start my floor underlayment: 1 - Dricore tiles underlayment 2 - Ditra tile underlayment I'm not sure if I should...

The problem are the braces. As you see, there is a lot of distance (about a meter) to cover before I can get to a piece of plywood placed over joists. I can't just step between the joists and braces. Here they are precut batts.

I am adding extra fiberglass batts to bring my total insulation to R40. What's bothersome is reaching behind those braces. . Ignore the arrow The headroom is already very low (4 feet in the center). The braces are on every joist, so I'd need to be some sort of acrobat to get behind...