As far as using a tri pod mount on the top of the roof - Forget it.
If you have high winds - like the high winds I have, you will find your antenna laying on the roof if you are lucky and laying on the ground if you are not.

The commercial antenna mounts are not robust enough to just stick a mast on the side of the house. At the minimum, I would want 1 1/4 semi rigid conduit for a mast and 3 mounts on the side of the house and a ground stake driven into the soil right next to the mast and a stainless steel ground clamp attached to the galvanized pipe.

If you place a copper wire directly to the galvanized pipe, it will cause galvanic corrosion - make the pipe rust!
I would also put a PolyPhaser on the ground stake before I bought the coax into the house.

Mo money, mo money, mo money!

Good coax will also pay huge dividends when working 6 meters.
Belden 9913 or LMR 400 should be on your shopping list...

You should try to get the antenna 10' higher then everything in the neighborhood, or at least 30' - 50' off the ground.

A 70' tower is optimal for working DX...