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Should I be wearing two masks?

macleans.ca

21–30 of 46 posts

Re: Should I be wearing two masks?

#21
post #4

No, but double masking will help until the real solution is acknowledged and implemented. Everyone should be wearing properly fit and sealed N95 masks from well known brands like 3M. Pieces of cloth that vaguely cover the mouth and nose but leave giant gaps do not protect the user very well. A proper 3M N95 that intentionally worn un-fit, with large gaps along the nose and sides becomes an ~N40. Unfit masks of any ty…

~300mm fabric masks per day in landfills? That sounds super eco-friendly.

Re: Should I be wearing two masks?

#22
The hospitals have been doing this from the beginning. There must be some truth to it. I think it's simple probability. A n95 mask lets in 5% of particles getting though. Layering two masks should effectually make a n99 mask ((1/20) * (1/20)) = 0.9975 The added mask only adds n4.9. It's probably a more effective use for second mask to go to someone who has a surgical mask.

Let's do the math for surgical masks which are like n20. Adding two n20's gives you a n40, which is marginally better than the n95 double masks.

Let me vent by saying I was on the pro-mask side when the CDC and WHO were against them, I made a website that went viral and got 7 million view letting people know your government officials were wrong. I had my account banned from Reddit and Facebook over being pro-mask. I even got contacted by the CDC to think about taking down the site. I told them to fuck off. When this pandemic is over and we can do a post-mortem on the pandemic the CDC and WHO will have blood on their hands for the poor messaging around masks.

I for one have been double masking n95's for a while.

Re: Should I be wearing two masks?

#23
post #4

No, but double masking will help until the real solution is acknowledged and implemented. Everyone should be wearing properly fit and sealed N95 masks from well known brands like 3M. Pieces of cloth that vaguely cover the mouth and nose but leave giant gaps do not protect the user very well. A proper 3M N95 that intentionally worn un-fit, with large gaps along the nose and sides becomes an ~N40. Unfit masks of any ty…

When you say a KN95 barely protects the user at all, are you stating that they are worse than a cloth/surgical mask? I recently purchased some kn95's to wear instead of the surgical masks when these variations started to pop up.

Sorry, I didn't meant to imply all KN95 are bad. I only mean the specification means very little in north america and of all the KN95 masks I have tried they have too high of a pressure drop across the actual filter to do filtering. When I use medical tape to seal them to my face they puff out and suck in dramatically. A low pressure drop N95 mask, when sealed with medical tape will barely move. You can even feel drafts from air conditioning through it.

What I am saying is that KN95 types in the USA are of such variably quality they are not a good choice. Use local standards and brands.

Re: Should I be wearing two masks?

#24
post #15
post #9

Earlier quoted context omitted.

I was told I’m anti science for saying poorly fitting cloth masks don’t work :-(

People were told last year that home made cloth masks were perfectly fine. I applaud skepticism at new claims, made without scientific backing, that now not even one mask is enough. My guess is that in order to increase the number of people wearing masks, they're trying a new scare tactic: maybe you should wear 2 or 3 masks. Maybe they hope that will cause people to wear at least one. Gotta herd the cattle somehow, I…

I know several virulent anti-maskers and telling them to wear 2-3 masks will just make them dig their heels in further. They’re literally laughing out loud at all these articles now.

Re: Should I be wearing two masks?

#25

The hospitals have been doing this from the beginning. There must be some truth to it. I think it's simple probability. A n95 mask lets in 5% of particles getting though. Layering two masks should effectually make a n99 mask ((1/20) * (1/20)) = 0.9975 The added mask only adds n4.9. It's probably a more effective use for second mask to go to someone who has a surgical mask. Let's do the math for surgical masks which a…

Kudos to you.

I agree with you a 100%.

It was such a common sense thing. I was telling my friends back in Feb/March that they should make it mandatory.

Sometimes experts get it wrong and it costs millions of lives. So sad..

Re: Should I be wearing two masks?

#26

Yes, and you should wear a helmet while walking or driving. https://www.trendhunter.com/trends/scandinavian-walking-helm...

I applaud any initiative to make life safer, but given that most accidents happen at home, why should you ever take your helmet off? They are literally killing people by telling them to only wear them outside!

Re: Should I be wearing two masks?

#27
post #9
post #4

No, but double masking will help until the real solution is acknowledged and implemented. Everyone should be wearing properly fit and sealed N95 masks from well known brands like 3M. Pieces of cloth that vaguely cover the mouth and nose but leave giant gaps do not protect the user very well. A proper 3M N95 that intentionally worn un-fit, with large gaps along the nose and sides becomes an ~N40. Unfit masks of any ty…

I was told I’m anti science for saying poorly fitting cloth masks don’t work :-(

Welcome to the outrage economy. Its great when you're on one side but sucks when you're on the other.

Re: Should I be wearing two masks?

#28
post #4

No, but double masking will help until the real solution is acknowledged and implemented. Everyone should be wearing properly fit and sealed N95 masks from well known brands like 3M. Pieces of cloth that vaguely cover the mouth and nose but leave giant gaps do not protect the user very well. A proper 3M N95 that intentionally worn un-fit, with large gaps along the nose and sides becomes an ~N40. Unfit masks of any ty…

~300mm fabric masks per day in landfills? That sounds super eco-friendly.

The idea is to rotate the masks, not to throw them away. You wear one then let it sit alone, without being touched, for a week or more. The next day you wear a new mask then do the same to it. A week later you can go back and wear the original mask again.

Throwing them away after 1 use would be silly. I personally have enough masks, and few enough indoors engagements, to let my N95 sit for a full month between re-uses.

Re: Should I be wearing two masks?

#29
post #9
post #4

No, but double masking will help until the real solution is acknowledged and implemented. Everyone should be wearing properly fit and sealed N95 masks from well known brands like 3M. Pieces of cloth that vaguely cover the mouth and nose but leave giant gaps do not protect the user very well. A proper 3M N95 that intentionally worn un-fit, with large gaps along the nose and sides becomes an ~N40. Unfit masks of any ty…

I was told I’m anti science for saying poorly fitting cloth masks don’t work :-(

It's pretty polarized in the US right now, so people will naturally lump people into the "pro-mask" camp and the "anti-mask" camp, and the latter is closely tied to a lot of anti-science views. It's an unfortunate heuristic we use a lot. You'll get it less if you provide more nuance and context, or signal that you do take things seriously. "We need to start using N95 and surgical masks because cloth masks don't work." won't get you called anti-science. (Maybe impractical, though surgical masks pretty widely available.)

To respond to your specific statement, part of the problem is that "don't work" is too blunt and not quite true. "Don't protect the wearer" might be true. "Barely protect the wearer" would be. "Don't provide strong protection for others" also true. But even a poorly fitted cloth mask is almost certainly better than nothing. (Of course, I'd also believe that they likely provide a false sense of security, leading to risk-taking that more than offsets their benefits.)

This ties in with one of my biggest frustrations of the whole pandemic, at least individual behavior: so many people's risk analysis is just sorting things into "safe" and "unsafe", rather than thinking in degrees. "Cloth masks don't work" is unhelpfuly binary and non-specific. (Though including "poorly fitting" makes it better -- "ensure proper fit" is actionable advice.)

And while efficacy of "cloth mask" vs. N95 is good to know, "cloth mask" is a super-broad category. I'll occasionally see people specify "single layer cloth masks", but the only single-layer cloth masks are gaiters, and even those are frequently folded over double.

How good is my 2- or 3-layer cloth mask? What materials should I use? (To be fair, I have seen some people answer this question.) Is it relevant that I can barely feel my breath through it or around the edges even if I blow hard? How much of a difference does fit make?

Ideally we'd all have and use good quality N95s, but we shouldn't make perfect the enemy of the good. We need information that will help us do better, rather than a binary "N95 good; everything else bad."

Re: Should I be wearing two masks?

#30
post #4

No, but double masking will help until the real solution is acknowledged and implemented. Everyone should be wearing properly fit and sealed N95 masks from well known brands like 3M. Pieces of cloth that vaguely cover the mouth and nose but leave giant gaps do not protect the user very well. A proper 3M N95 that intentionally worn un-fit, with large gaps along the nose and sides becomes an ~N40. Unfit masks of any ty…

~300mm fabric masks per day in landfills? That sounds super eco-friendly.

That's nothing compared to Starbucks coffee cup waste precovid.

And besides if you're arguing that we need to reduce landfill you shouldn't be advocating for any sort of anti-virus measures as any sort of population reduction will do more to reduce landfill than any sort of reusable mask could ever hope to accomplish.

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