> I know these aren't as good, but they probably improve my chances of avoiding SARS-CoV-2 by at least 10%
It's no better than avoiding personal contact generally.
Not everyone can avoid personal contact. Eventually you'll need to interact to some degree with others when getting groceries etc.
https://smartairfilters.com/en/blog/best-materials-make-diy-...
Re:State projections for Covid-19
by dragonwriter on Sunday March 22, 2020 @04:38AM
(#22653588)
> Eventually you'll need to interact to some degree with others when getting groceries etc.
The main risk when getting groceries, unless people are coughing or sneezing in your face, is transfers from your hands, which a surgical or n95/r95/p95 mask does roughly zero to help with. (Now, getting everyone else to wear such a mask would reduce the odds of them contaminating something that would get on your hands, but that's not a benefit of you wearing mask.)
My daughter is also sewing cloth mask using a pattern from https://www.craftpassion.com/face-mask-sewing-pattern/
I know these aren't as good, but they probably improve my chances of avoiding SARS-CoV-2 by at least 10% when I have to go outside. I plan on using them once, then leaving them in a bucket in the garage. Once I've used them all up, I'll wash them and by that time (and hopefully the detergent + bleach action), the virus will be dead.