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FAQ

A clerk told there there is a special hole saw for ceeeeeement board--but I never saw the same clerk again. I need to make five 2'' holes.

You should use a carbide abrasive hole saw for any cement board. Trying to use a standard bi-metal hole saw will only work once, maybe twice. As a plumber, I have to drill through cement board all the time. IMO it's worth it to go to Lowes or Depot to get the right hole saw for the job.

Replacing the cement board is not realistic, I don't know of anything that may be more flexible and not deteriorate so quickly.

there are some colored cement repair products that contain silicone that may work good, also you can just use white silicone or caulk just squeeze it in and let it dry have a rag handy for cleanup both are flexible and last a long time.

installed the most powerful exhaust fan that is made and my newly painted hardi backer walls are sweating when take a shower or bath with the fan running- what can I do?

is it the outside wall.it may need to be insulated.

I'm ready to tile my kitchen soon. My husband and I have torn up the carpet and 2 layers of linoleum, leaving only some leftover glue from the linoleum and the wood sub floor. Do we really need to lay cement board over the wood sub floor or can we just go ahead and tile right on the wood? (FYI: it will be either ceramic or porcelain tile)

I take you're in in the USA so not sure you can get an elastomeric adhesive such as BAL fast flex. If your sub floor is sound and deflection free you could use this.

Hello, my husband and myself are remodeling our bathroom....here's the question... we removed hideous vinyle tiles and underneath is the cement floor with thin layer of black adhesive from the tiles....the floor is pretty sound except for a small crack in cement by the entry door.... should we fix the crack and tile over the cement? or thin set 1/4''cement fiber board to the floor and tile over that? and if we do use the fiber board is the thin set enough to hold it down? we can't really screw/nail it cuz subfloor is cement. Any help is appreciated! Thanks!

Always use backer board! Expansion and contraction will crack every grout joint if you dont use it. The only exception is if you use a rubber based emulsion on the floor first and add fiberglass mesh. I dont know of one county in the United States that has building code other than what I stated. Look up the United States UBC (Uniform Building Code). Dont take my word for it... Contact your local building inspectors office and ask. They are there to protect the consumer and residents against guys like the one that posted before me (with all due respect).

I'm preparing to replace the tiles in my foyer. It's a townhouse, about 20 years old with no basement. I don't know much in the way of construction, but since it's on ground level I think there might just be a cement slab underneath the existing tile. Can I install the tiles directly over the cement slab after removing the old tile or do I need a backer board? And if I do, how do I account for the height difference? Thanks in advance!

If it's concrete, you don't use backer board. That is only used over a plywood subfloor. As for height difference, you can get reducer strips of different materials to transition from one surface to another. Hope this helps.

We have drywall in our kitchen that was painted with a smooth semi-gloss paint a good 8 yrs ago. We'd like to install 3x6 tumbled marble as a backsplash over the drywall. It's about 1/4 thick so probably slightly heavier than say, the tiny square glass tiles that come on a 12x12 netting. One person at the Home Depot said we could just sand and scrape up the drywall and then apply the thinset and install the marble. Another said we might want to use a cement backing. We aren't really DIYers and would so we don't want to create extra work with the cement backing if it isn't needed. That said, we don't want the drywall to start peeling and the marble tiles to start falling off after a short amount of time. Please advise. Thank you!

ild install a 1/4' hardyboard board first -the thinset will not last sticking the tiles to the paint

Is there anything you can add to cement which will increase insulating power?I guess asbestos is illegal and I am not even sure how much it would work, but I was wondering if there isnt something out there that will add R value to cement if you add it to the mix without substantially reducing the strength of the cement itself.

thickness...the thicker the concrete, the better it will insulate