White powder on basement floors

genegoddessJune 16, 2009

I just bought and moved into a house in central Mass that was built in 1960. I bought it from the original owners (who moved to a retirement community) and it was in "original condition" (avocado toilet/sinks/bathtubs, etc). The basement is divided into three areas: the workshop (huge, plain concrete floors) and the finished "gameroom" that was 1/3 painted concrete overlayed with Astroturf and 2/3 original vinyl/linoleum tile glued directly to the concrete. I just spent the day removing all of the carpet (taped down) and tiles (glued) and now have a question: what is this white powder, 'cause I know its not coke!

Before you say, "Well, its efflorescence, of course", let me clarify. There is no white powder on any of the floor of the workshop and RARE patches on the walls of workshop (workshop area is a big "C" around the gameroom). There is no powder on any of the gameroom walls (painted concrete, unpainted in rare areas). There was no powder under the carpet (where the floor had been painted). There was only powder that collected in about half of the grooves in between the tiles(enough to easily scrape up into your hands), but it was not all over the tiled area. Made it very easy to lift up the tiles, whatever it is.

We tested the powder (geeky scientists) and it dissolves easily in water, but does not bubble or foam when undilated vinegar is dripped onto it. After handling it, your hands feel smooth after washing them. I did not taste it. No odor. My spouse thinks its detergent from them mopping the tiles. I think its efflorescence.

The basement does NOT have a sump pump and, per the owners, has never flooded (and I actually believe them). Musty smell, but not too bad (remember, fifty years without a renovation - 60's tile...UGH).

So, here are my questions:

  1. Is this efflorescence?

  2. How should I clean it (other than sweeping)?

  3. How should I "seal" the bare concrete floor? Paint seemed to do well on one part... Kilz?

  4. Any recommendations for brands of carpet tiles? (Flor, etc?)

Thanks! And hi to anyone who remembers me from the Ficus and Citrus forums!

Thank you for reporting this comment. Undo
brickeyee

"We tested the powder (geeky scientists) and it dissolves easily in water, but does not bubble or foam when undilated vinegar is dripped onto it."

Not all efflorescence is calcium based and reacts with vinegar.

If your hands are wet and you place a little on you fingers, does it feel slippery?
Detergent or soap residue should be slippery.

You may not see efflorescence in the rest of the basement sine the concrete was exposed. It would have been cleaned up or dispersed.

Vacuum it up with a shop vac, wet mop the floor, allow it to dry,then apply drylok.

It is pretty effective at very minor efflorescence and concrete dusting.

    Bookmark   June 23, 2009 at 1:55PM
Sign Up to comment
More Discussions
FG & Rim Joist Insulation --- HELP!!!
Help - My builder (doing a fire rebuild) wants to put...
mdln
Basement Plans Thoughts?
Hello, Planning to finishing my basement and hoping...
NYcRavi
Ceiling insulation in basement
We are finishing our basement and I am getting to the...
mirandajae
Walkout Basement in Texas
Greetings to all! I have a sloping lot on Lake Conroe...
ZipAgent
upgrade R11 to R13 insulation in basement?
We are in the process of remodeling our basement. We...
Desirun2
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™