carpet glue residual on concrete floor


Old 08-23-12, 12:05 PM
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carpet glue residual on concrete floor

Have removed old glued down carpet from concrete basement floor. Plan is to install porcelain tile.

First how to best remove residual glue? Should I use a product like "Sentinel 747 Plus Floor Adhesive Remover" or would some type of floor sander work? Hand scraping is a big job, floor measures 12' by 30'.

Next, what would be recommended underlay to use between tile and concrete?

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Old 08-23-12, 12:51 PM
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Do not use a chemical to remove the glue, it can cause adhesion issues for your tile. Best bet is hot water, a scraper and a lot of elbow grease.

Tile can be installed directly over concrete if it is in good condition. Ditra is an excellent underlayment, should you choose to use one.
Old 08-23-12, 06:26 PM
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For that big of a area, i would go to a rental store, rent a floor buffer with a scrape-away blade. In two hours or less you can have the floor down to concrete, even if the glues still sticky (use a little water to keep the dust down.) some of the new modified thinsets will let you adhere to old glue(if its not the envromentaly safe stuff sold in the 80's) you can tell by a white color and scrapes off easy with your fingernail and is powdery. it,s still best to remove any type of glue. For porcelane tile, you will need modified thinset for the tile.
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