PILOON
Super Star Member
From all I have gathered, Dexpan and probably 5-6 holes will split that nice.
I had a neighbor that even did that with 1/2" holes and plug and feathers, but he had lots of time on hand.*
He'd drill some 5-6 1/2" holes 3/4 thru and insert the plugs and pound with a 5 lb sledge and presto!
Under my cabin I also split with plugs but that was with a 300 cfm compressor, some 15 mins per boulder using 3 plugs/hole per.
I'd vote for dexpan and as big as your hammer drill will handle.
It works, I've seen it.
*shucks he even drilled with a small sledge and star shaped hand bit.
I had a neighbor that even did that with 1/2" holes and plug and feathers, but he had lots of time on hand.*
He'd drill some 5-6 1/2" holes 3/4 thru and insert the plugs and pound with a 5 lb sledge and presto!
Under my cabin I also split with plugs but that was with a 300 cfm compressor, some 15 mins per boulder using 3 plugs/hole per.
I'd vote for dexpan and as big as your hammer drill will handle.
It works, I've seen it.
*shucks he even drilled with a small sledge and star shaped hand bit.