Amish made hardwood

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 Post subject: Adhesive over Old mastic?
PostPosted: Sun Mar 17, 2024 8:13 pm 
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What is your recommendation for wood floors to go over old black mastic adhesive covered cement in an apartment building? Thank you!


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 Post subject: Re: Adhesive over Old mastic?
PostPosted: Sun Mar 17, 2024 10:19 pm 
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Your best will be an engineered floor that is pre-finished. Get the floor flat as possible, within a quarter inch in ten feet is recommended. A cementitious self leveling patch can stick to the asphalt based glue. You will need a plastic sheet and eighth inch thick foam under the floating floor. Floor mastic does not stick to that black stuff.


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 Post subject: Re: Adhesive over Old mastic?
PostPosted: Sun Mar 17, 2024 10:46 pm 
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Thank you.

Multiple wood floor professionals, as well as the Bostik adhesive tech rep have agreed with you that the adhesive will not stick to the mastic. However, my building’s contractor is insisting that he wants to use adhesive directly on the mastic. No subfloor, no skim coating, no foam underlayer. Is there something that I can show them about why mastic over adhesive will not work?


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 Post subject: Re: Adhesive over Old mastic?
PostPosted: Wed Mar 20, 2024 12:21 am 
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The only thing that sticks to tar is more tar. This type of adhesive is not sold anymore because of clean air regulations.


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