Concrete sub-floor, no backer board. 40 year old 4 x 3 tiles with yellow
"mastic" as the adhesive. It's caked on good underneath and it's old. I
wanna prevent renting a Hilti/Kango with a scrapper cause it'll cost $100
around these parts for a day. That'll be a last resort I guess
And type of manual scrapers?
grinders or some other abrasive?
I can't damage the sub-floor (concrete) underneath.
I really wish but no. The grouting was done very poorly on this particular
floor but the tiles are only 4 x 2 inches, not 12 x 12 for example. Several
of the tiles are broken and many others they have become uneven. I'm
putting in a duraceramic floating floor and the tile store owner and
installer said the paper backer might not hold up if apply overtop of such
small tiles. It'll be in a heavy traffic area.
A five foot solid steel wrecking bar with a chisel point will do just
fine and you can pick one up for probably less than 20 bucks.
They weigh about 50 pounds or so, all that force is concentrated to
the tip, when you slide it on the underlayment the majority of the
tiles will simply pop off. The ones that dont, hit em with the bar
from the top and pulverize them.
There is no underlayment. It's a solid concrete pad. There is no basement
to this part of the house. With a point I'll chip the concrete
That said everyone says use the power tool with the scraper. I guess it's
worth $100 by the sounds of it.
You are going to chip and ding the concrete no matter what. Small
scratches, pops, and dings will not prevent installing the next
floor. The power scraper will gouge more than the pinch bar. You
can use a brick set (wide cold chisel), a heavy hammer, and a face
Keep the whole world singing . . .
A heat gun might help soften the adhesive, then scrape it with a wide
putty knife. It all depends on the size of the floor. If its a
bathroom, this should be fine. If it's a 20x 50 foot room, rent the
Rent the scraper. Using it, getting the tile off will go fast and easy. I
have no idea how effective it would be on the mastic itself though. In the
past, I have used a torch to remove mastic, works OK but takes time.
If you a suitable sized compressor, Harbor Freight has long reach air
scraper for $99.00 -- on sale.
Long Reach Air Scraper
Item # 37073
Extra wide 4" blade makes short work of tiles and linoleum covered
floors. 2200 blows per minute separates any glued floor coverings
Piston diameter: 1-1/8"
Air pressure: 90 PSI
Air consumption: 10 CFM
Air inlet: 1/4" NPT
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