Which of these chisels for chiseling up tile floors?

[snowjim]

Hello,

I'm in the process of breaking up a tile floor in the kitchen that consists of the following layers:

- Tile with grout
- Casting with heating cable (electric)
- Gypsum
- A layer of something thin and white that I don't know what it is
- Particle board

Here's how it looks


http://i.imgur.com/PIeDRLG.jpg

I want to keep the particle board and the white layer is not a major issue if it stays. Stepfoam and parquet will be laid on top of this later.

I've already tried breaking the floor with a crowbar and a regular manual chisel, but it takes way too long, so I've now picked up the hammer drill (Makita HR2610). So far, I've been using a standard chisel that looks like this:



But since it easily made holes in the floor



I've now bought these; the question is, which one is best suited? Since they cost 180 SEK each, the idea is to return 2 of them.


http://i.imgur.com/5928Qyi.jpg

http://i.imgur.com/xgrIskN.jpg

http://i.imgur.com/Au7Rser.jpg

The one from the brand KWB is clearly thinner and looks like it could dig under the gypsum better. The Bosch chisels are both quite thick, as you can see. Then I don't know if a curved chisel is good on a hammer drill (with hammer only activated)? When I used the straight chisel earlier, I had to lean quite a bit, but it still dug into the floor a couple of times, which is understandable since it is straight.

 

[anders07]

Curved chisel works well for tiles and if it's not very hard, the narrower one should work better, I think. I would try with that one, otherwise the one in the middle.

 

[snowjim]

Drove but the curved narrow one that is KWB and it worked really well, no more holes in the base floor. However, have a little more than half left after 3 hours so I'll get on it again tomorrow.