Any experience with renovating with celotex.
my home has celotex from the 80’s
I want to replace windows and siding. The steel diagonal bracing is in I have no racking structure issue integrity is good.
What I want to accomplish is giving my home more impact strength from possible storm projectiles. Then what foam batt insulation and drywall provides.
I also want 100% nailer options in addition to going into studs for cement board siding.
i know I will have a gap with trim with the extra thickness of the sheathing. Not worried about that I can trim.
my concern is any problem with moisture getting trapped any detail I should consider. In addition to re taping celotex joints that were not and filling any voids from damage.
Tried researching anything on past projects with the details. Nothing has come up and no specific details from the company itself.
You past experience on this will be greatly appreciated.
You find any links or know of any with direct knowledge on this will also be appreciated. Thanks for your time.
Replies
I also would like to know more about celotex. Thank you so much for the updates.
I ran miles of Celotex in the 90’s. I don’t believe the company exists any more. There is a UK Celotex company, but that is a totally different company. Two main concerns for me are not knowing the chemical composition compared
to the foams today and not seeing it tested by today’s standards. Also, most of the stuff I installed in the 90’s was 1/2” thick and an r value of maybe 3. Thickness and permeability of foam are important factors. If celotex is more permeable moisture can be an issue. Also, if you have 1/2” there’s a good chance that it is not adequate for dew point temp issues. For foam to work properly the temp in which dew point occurs must happen w/in the foam. If dew point temp is on the inside or outside face of foam it can create a lot of moisture problems. Most regions in the US require 2” of foam to address the dew point issue. You can check w/ your local code for thickness of foam to use for your climate. If you are confident proper thickness of foam is used and that it’s not a permeable foam, probably safe to say you can apply plywood over the top. If not and you want to keep the foam, I would install plywood in a rain screen type manner over the foam, so it can drain moisture. If it where my home and not using high performance type methods, I would take the Celotex off (assuming it’s 1/2”) and install ply direct to studs. Can make improvements w/in the wall cavity at that time too. Also, pull wire etc for future work.