Rockwool / Discussions

...rockwool (batten) right against the wood beams on the outside. Then an air barrier- WRB (as sealed as possible), then another layer of continuous rockwool board, followed by an air gap with diagonal furrings. Then we will attach vertical wood siding. Is this a good plan? Is the location for the air barrier right? To cl...

...rockwool sometimes being too loose and falling out before adding the gypsum. Any advice for the best (and most ecological) sound proofing option for a first floor ceiling (not an attic) would be very welcome. Finally, how does the costs of a system using rock wool versus cellulose compare?    There are a few ways to so...

Hi guys im from Canada and I recently finish studying and insulating my basement. I used one and a half inch polyiso board insulation glued to the wall with adhesive and I left a half inch Gap all around the board to spray foam. In front of the wall I frame to buy for walls and insulated with Roxul insulation Batts I w...

Hello, We are redoing our basement ourselves (zone 5, Toronto) and on a budget after gutting the entire finished basement due to extensive moisture penetration and mold issues. The foundation/walls are concrete block and we have 2 sides done with interior plastic membrane to french drain and sump pump, one side exterio...

...rockwool insulation and the closed cell spray foam.  My concern with trying to fill the void will also likely have air gaps and the rockwool gets pretty beaten up when stuffing it between the studs and the uneven closed cell foam.  Morevoer, the alighment with the rockwool and the studs quickly goes out of alignment le...

...Rockwool comfortboard mineral wool insulation at foundation skirting. We did just that on our 2015 demo house project, and the company wasn’t  a whole lot more helpful at the time for us either. Slab on grade foundation insulation is not a market they seem interested in competing in. They told us it *should* be fine, a...

Hello I have a semi detached house in Toronto Canada. The house built in the 1930's is double brick wall. The house is original and has little to no insulation right now. I want to insulate the house from the outside with as high R value as possible. After insulation I was thinking James Hardie siding. Apparently brick...

Hello, our house built in 1920 untouched save for a simple kitchen. It's walls are toung and groove pine. No heat no insulation just the wainscotting walls. The interior frame ar 2 by 4's. we wish to live there through the summer from May 1st to October 8th ish. We have to install heat and insulation for the times when...

...Rockwool panels on the exterior of sheathing, which works, but there are new interesting ways to attach it. this one may interest you, it’s ThermalWall rigid foam insulation panels from Legalett that have rails on the interior of the foam so you can attach them with short screws, then attach the strapping to the same r...

...Rockwool insulation as it doesn’t trap moisture. That’s a much safer way. Mineral wool is sort of a ‘foolproof’ insulation in that way, as moisture moves right through it and causes no harm.  2 inches of Rockwool you could attach with strapping, and if you wanted to go the thicker foam route then |I’d look at Thermalwa...

...Rockwool Mineral wool insulation is that it is resistant to moisture damage, but trapping moisture inside will allow condensation to form on the wood. You can learn more here about how that happens and how to avoid it –  How to build and renovate basements properly so they don’t develop mold When you see Rockwool on ba...

Old house; basement is only 21% of total under house footage. 79% is crawl space. Basement Never painted. Walls go up 4 ft to a 2ft wide ledge and then the old stone foundation. 1 side is an exterior wall; 3 sides are crawl space beyond the stone.  A lot of heat is lost through uninsulated basement floors, so good idea...

8" semi rigid and 5 1/2" between the studs.  why not use 8" semi rigid, 3 1/2" between the studs and 2 " more semi rigid on the inside beneath the gyprock?  Is that possible? Hi Tom, 2x4s can be used for homes no problem, but it definitely fattens up the posts required between windows. The sections of wall between the ...

...Rockwool insulation boards can go right against the CMU wall (Rockwool / mineral wool is not harmed by moisture, so you alleviate the risk or mold forming inside walls. Then add the stud wall (with batts in the cavities). Unless you need the smart membrane to appease a building inspector, we would omit it. Where the wa...

...Rockwool rigid insulation boards (photo below). They were surprisingly easy to build, we just ripped the insulation panels on a table saw and just pressure fit them in place. It didn’t end up making it into the mix, but we sure had fun getting students and teachers to explore innovative building techniques!    

...Rockwool comes in batt insulation as well as rigid, so  I wouldn’t be cutting it up to fit anywhere, they should have the sizes you need. Rockwool, (formerly known as Roxul),  is very permeable to moisture so while it isn’t the cheapest, it is the most foolproof as it won’t ever trap moisture like some foam insulation ...

...Rockwool). We like it for the very reasons you mention, that it isn’t harmed by moisture and it lets moisture pass right through it. Here is the page you really need to read though, all about the various options for exterior rigid insulation so you know the characteristics of each – Choosing the best exterior rigid ins...

We live in San Jose California. Our house is 50 years old and I would like to add insulation to the outside of our stucco siding (concrete like material, about 3/4" thick). I was thinking about attaching large insulating panels (styrofoam or similar) similar to the ones they use all over Europe. I am looking for a poin...