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Question DetailsAsked on 5/30/2017

Using a small excavator with a hammer to remove a granite ledge 10ft close to a house can dame the foundation?

Installing underground tank

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I don't understand why you are expensively removing rock to bury a tank (unless this is just one small piece of bedrock or large boulder in otherwise decently excavated material) - unless your area prohibits above-ground tanks (which can be enclosed in a decorative lattice or trellis enclosure or such), but I would have no concern (except as noted below) at all 10 feet away, and even within about 2-3 feet. Closer than that I would be looking at maybe requiring special care.


One caveat - I would require plywood or cardboard shielding of any windows or air conditioner condensor coil/fan if within less than about 10 feet horizontally and not more than about 5 feet vertically above the hammering location, as protection against damage by flying chips. Commonly just by (making sure A/C is off) just leaning some plywood against it or even a tarp tightly pulled over it to repel chips - you are not looking at large pieces, typically just pebble sized and small unless you are within 1-2 feet of the hammer.


One other exception - if you have a mortared stone foundation and it is in poor condition (tilting or mortar deteriorated) then I would not use a mobile equipment hammer closer than about 5 feet - for that situation I would require hand-held jackhammering.

Answered 1 year ago by LCD




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