[TheForge] Hammer foundations

[Steve Smith]

I get a small part of the barn we're having put up, about 300 sq. feet. 
It is being built with a floating slab, 7 1/2" thick. I need to consider 
an air hammer and a treadle hammer.

Treadle hammer:
A friend of mine put his TH in the driveway with no pad. The drive is 
cracking and chipping under the anvil end. Clearly a pad is a good idea; 
how large of a footprint does a TH need? Mine is on the small side, and 
I'm wondering if I should put a metal plate under, then a pad or if just 
a pad will do. The base on mine is about 12" wide 5/8" thick, with two 
6" ears at the anvil end.

Air Hammer:
The yet unfinished air hammer will be about 40 pound head weight, self 
contained variety. I used to have a 25 pound Little Giant, which I 
mounted per recommended foundation plans. For those who aren't familiar, 
  the recommended approach has the mounting bolts made from threaded rod 
which ties into the rebar, and runs up through pipe sleeves so the ends 
of the rod have some give. While I think this approach makes good sense, 
I've just moved and many of my shop tools aren't easily set up (not 
having a shop...). Does anyone have experience with simpler methods of 
mounting?

Thanks,
Steve Smith