Understanding SQM

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When you go to install insulation, the first thing you will need to know is the square meters (SQM) of coverage.

SQM is calculated by multiplying the height by the length of an area.

But that is not the end of the story. Things can get more complicated.

What a Retailer Says is SQM

When you go to purchase insulation, some retailers will list the SQM coverage for the particular bag. This number could be the absolute SQM or the SQM coverage once you take into consideration your studs and noggins.

More R equals less SQM

If you decide to upgrade your R-value rating, a dense batt will mean less batts per bag, which equates to less SQM per bag. This means a bag of R2.5 has a lot less coverage than a bag of R1.5.

Differences with Manufacturers

And it doesn’t stop there. Different manufacturers can and do fit a different number of batts into their bags. Knauf batts, for example, have a compression technology that allows for an above average number of batts per bag.

So what can you do?

Look for the sqm per bag number. This calculation excludes any assumption for studs or noggins.


Understanding the SQM of your product is just one of the three most common mistakes we see customers make. CLICK HERE to read about the other two.