On Wed, 9 Jun 2010 21:13:50 -0400, "The Henchman" wrote:

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

Solvents?

And type of manual scrapers?

grinders or some other abrasive?

I can't damage the sub-floor (concrete) underneath.


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
quickly.

Piston diameter: 1-1/8"
Air pressu 90 PSI
Air consumption: 10 CFM
Air inlet: 1/4" NPT

http://www.harborfreight.com/air-too...per-37073.html

Don't worry about chipping the concrete. If you chip the concrete,
just patch the chip holes with new concrete.

John