Help with retrofitting Roxul ComfortBoard / ComfortBatt in existing structure
I need help with my basement insulation project. I am very new at this kind of work so please be forgiving.
I started the project some time ago with the intention of using sray polyurethane foam on the concrete walls and the ceiling joists. So I built a 2 x 3 structure 1 inch away from the concrete wall and was looking to get a contractor to spray foam. But then I realized that the foam is not so green and that the EPA investigates its possible health effects, so I kept researching on the topic and I have to say that what I read scared the hell out of me. So I decided to ditch the PU option and look for something else. I found out about the combinaton of roxul comfortboard and comfortbatt which is the option I like the best for ecological and health concerns. My idea was to detach the walls from the floor and ceiling and to install comfortboard on the concrete, reattach the wall on the comfortboard and then put some comfortbatt between the studs. But comfortbatt are made for 2 x 4 not 2 x 3. So my question what is my best option:
- Replace 2 x 3 by 2 x 4 and do the work all over again? Maybe I could keep some of the 2 x 3 for my interior walls but I don't have as much interior walls.
- Nail 2 x 1 on my 2 x 3 to make them 2 x 4? I guess this is not a good idea since the 1 x 2 may curve differently than the 2 x 3 and this will leave air gaps everywhere in the structure which I think is not a good idea?
- Use some other insulation technique? I don't like the PU option because of the chemicals inside and the same goes for rigid foam and their fire retardants.
I live in Quebec, Canada so it's a pretty cold climate and I am seeking an insulation with an R value of 14 or more.
Please help. Any suggestion is appreciated.
Posted Sat, 09/14/2013 - 07:26
Edited Mon, 09/16/2013 - 08:36
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