Do we need to overlap rock wool?
It seems like it’s common practice to seams in mineral wool, as seen in this Eco Home video:
However, in looking at Rock Wool (Roxul), a claim appears on page 3 of the following pdf that the material will knit together when pressed.
So, if one using a thickness that can be accommodated by a single product, say 3″ of Comfortboard, is there any benefit to going with two layers of 1.5″ insulation vs a single layer of 3″?
I cannot find this Duo Slab item on the US Roxul website, and when I reached out to them about the knitting claim there was no response.
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