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    dlshutch's Avatar
    dlshutch Posts: 6, Reputation: 2
    New Member

    Apr 28, 2007, 09:42 AM
    How should I cover/seal black mastic?
    My basement floor had tiles that turned out to have some asbestos content. I didn't realize what I was dealing with until I had almost completely removed the tiles. I'm left with 'black mastic' on the concrete that may or may not contain asbestos.
    I'm planning on re-finishing the basement and adding carpet soon, but not until I have some waterproofing done. In the meantime, I'd like to cover/seal the mastic to prevent any potential asbestos from becoming airborne.
    I had two ideas:
    1. Put down some cheap self-stick tiles
    2. Paint with a floor paint.

    Anyone know what will happen if I try to paint over the mastic? Painting would obviously be cheaper, and since this is just a temporary measure, I'd like to keep it cheap and simple!

    Thanks for any advice!
    jo0ober's Avatar
    jo0ober Posts: 1, Reputation: 1
    New Member

    Oct 15, 2010, 09:05 AM
    Asbestos is a form of population control they knew it was dangerous long ago and continued to build up the country with plenty of schools, homes,institutions,government buildings,town halls,military installations,industrial complexes etc and figured f**k it at least the asbestos is fire proof(good for the fall out shelters!):D... bullchit:)
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
    Ultra Member

    Oct 17, 2010, 06:52 PM

    The most common used mastic for basements did not contain asbestos.

    How did u find out that tile had asbestos in it?
    Did u have it tested?

    whaleboy's Avatar
    whaleboy Posts: 1, Reputation: 1
    New Member

    Jul 1, 2011, 07:18 AM
    If the tile was 9"x9" and was very brittle when you removed it. Then this tile "more than likely" also contained asbestos as well. Which when you broke it into pieces created what is known as a Friable Condition. Which released fibers into the air. Not good. The mastic in the condition it is in now as long as you do not scrap or try and remove this by sanding, abrasion methods, etc. you should be OK. However the best method of removal of this black mastic which is also non-friable like the tile in the state that it is in, can be abated with a low VOC mastic removal solution - but you must wear respirator approved for both vapors and asbestos (HEPA) and it is a good idea to wear rubber disposable boots with several layers of tyvex suits... And lots of rags. Then you need to pour solution on black mastic - let it sit for several hours - come back and start wiping up on hands and knees. Bag up (double bag or better yet drum up rags) Call abatement company first to see how much they would charge to take drum / bags. Check your EPA region to see if you as the Home Owner can just throw this in the regular trash, If not call abatement company.. Cost is typically only $3/SF to remove the correct method by an abatement company. And if you use an abatement company they will give you a report and "encapsulate" at the end of the project which will help capture and lock down any fibers still in the air from breaking up that tile... Hope this helps?
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
    Ultra Member

    Jul 1, 2011, 06:13 PM
    Hi whaleboy

    This post is over 4 years old. Think job is done by now. I did the same thing when first went on. Check date from poster before answering.

    Glad to have u aboard.

    tagracks's Avatar
    tagracks Posts: 2, Reputation: 1
    New Member

    Dec 6, 2012, 12:06 PM
    Doesn't matter the age of the original post the information provided by Whaleboy is good anytime and helps those in the same boat today.(like me)
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
    Ultra Member

    Dec 6, 2012, 03:58 PM
    Welcome to AMHD tagracks

    It is true that info in old posts are helpful. Did not mean that, but some posts can have quite a few answers and a lot of people will not read all the answers in a post. A lot can be missed.

    Loretta2013's Avatar
    Loretta2013 Posts: 1, Reputation: 1
    New Member

    May 7, 2013, 02:09 PM
    How about black mastics on concrete slabs (home built in 1973)?
    kokocadilac's Avatar
    kokocadilac Posts: 1, Reputation: 1
    New Member

    Oct 4, 2017, 03:10 PM
    I am contractor and this is what Iíve done for the past 15 years;
    Just apply PerfectPrimer on top of the mastic, or tiles.
    It safe to use and seals the asbestos mastic.Then apply any paint, epoxy, or new tile mastic to the PerfectPrimer and it
    Bonds just great. Iíve never had a problem with it and this is the only product made for this purpose.

    RichCo Construction

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