I have a triple decker in S. Boston. The house is old and is sinking about 1.5" in the back. I am going to install 6" diameter support posts. What type of footing should I pour?
Thank you
Paul

What are you trying to support? Keeping the house from settling? No 6 x6 will do that. More detail please.

Perhaps you mean porches? (I'm familiar with those 3 deckers).
Are you sure they are sinking? They were designed to slope about 1.5" for rain runoff and were built that way.
If you are talking about porches and if they do need replacing anyway, I'm pretty sure the frost line depth in Boston is 42". Ask any lumberyard because they sell Sonotubes at the right length all the time.

I don't know how much your building inspector drives around, but triple decker porches have a history of killing people around Boston when they fail, and I'll bet inspectors have their eye out. So if you haven't already, get that permit first.

The house is 63' x 24' it has 4' lally columns, 10 of them. We are going to jack the house up, put in 10 new lally columns and pour a new floor. I need to Know if there is a specific cement I should use for the lally column footings.
Thanks.
Paul

Boston no doubt has specifications stating the required psi for structural concrete. Concrete suppliers in the area should be able to give you a mix with sufficient quantity of cement to meet the specifications. Probably in the area of 3,000 psi.

Boston no doubt has specifications stating the required psi for structural concrete. Concrete suppliers in the area should be able to give you a mix with sufficient quantity of cement to meet the specifications. Probably in the area of 3,000 psi.

Okay. Thanks