sealing concrete floor before tiling ??

drummers · 03-21-2010, 08:38 PM

should you seal a concrete basement floor before laying ceramic tile. the concrete floor in my basement is 25 years old , it was power troweled but not too smooth, just normal. the floor is smooth, level and is bone dry year around . is there any reason to seal the floor to improve adhesion or any other reason.someone told me to, but i think the thinset morter would adhere better to the concrete than to a sealer. thanks for any help drummers

**oh'mike** · 03-21-2010, 10:33 PM

You are right --leave the concrete alone--no sealer--I would use a modified thinset.--Mike--

JazMan · 03-21-2010, 11:10 PM

Just read the bag, it'll tell you to remove any sealers that might be on the concrete. Not an easy task. The concrete has to be porous, otherwise how is the thin set going to bond?

How about cracks, expansion joints, control joints, cold joints?

Jaz

03-21-2010, 08:38 PM	#1
drummers Newbie Join Date: Mar 2010 Posts: 1	sealing concrete floor before tiling ?? should you seal a concrete basement floor before laying ceramic tile. the concrete floor in my basement is 25 years old , it was power troweled but not too smooth, just normal. the floor is smooth, level and is bone dry year around . is there any reason to seal the floor to improve adhesion or any other reason.someone told me to, but i think the thinset morter would adhere better to the concrete than to a sealer. thanks for any help drummers

03-21-2010, 10:33 PM	#2
oh'mike Super Moderator Join Date: Sep 2009 Location: Kane county,Illinois Posts: 16,778	sealing concrete floor before tiling ?? You are right --leave the concrete alone--no sealer--I would use a modified thinset.--Mike--

03-21-2010, 11:10 PM	#3
JazMan Tileguy Join Date: Feb 2007 Location: Troy, Michigan Posts: 3,287	sealing concrete floor before tiling ?? Just read the bag, it'll tell you to remove any sealers that might be on the concrete. Not an easy task. The concrete has to be porous, otherwise how is the thin set going to bond? How about cracks, expansion joints, control joints, cold joints? Jaz __________________ Tile 4 You LLC Troy, MI KERDI Shower Specialist ... DITRA Installs ... Product-Method suitability consultation. I have NEVER made a mistake, I thought I did once...........but I was wrong! - PRODUCTS ADVERTISED WITHIN MY POST ARE NOT ENDORSED BY ME!

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sealing concrete floor before tiling ??