Most importantly, find a contractor you feel comfortable with, & all these concerns can be put behind you.I am putting a 16'x16' addition on my house. I have decided to go with a full basement addition under it, which will be connected to my existing unfinished basement. I have 8" thick poured walls with brick facing. The new addition will also be done with brick faced forms. I have a few questions about this process and the contractor seems to be pretty non-chalant about it, so I thought I'd get some other opinions.
1. How should the new addition be attached? Bolts, rebar? Should the existing walls be notched out and the new ones poured within them, or just butted up?
Definately rebar , probably #4 or #5's on 16-24" centers.
2. My existing foundation has Form-A-Drain on the inside and socked 3" tile/rock around the outside. My soil is very sandy, and I've never had a problem with leaking in the 5 years we've been here. I have never noticed the sump pump running, even during heavy rainfall periods. So, what should I do for drainage around the addition?
This is kind of an odd set-up, at least for my region. I've never seen a combo system with Form-a-Drain & 3" corragated. I would probably suggest just sticking with the 3" in this situation, or whatever your mason suggests.
3. What should I do for waterproofing on the new walls? The existing foundation has damproofing to grade.
A spray-on damproofing shoud be adequate in you situation.
I appreciate any info anyone can provide!
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rebar as post'd,,, those of us in the waterproofing trade'd probably choose a trowel'd-on coating of sonneborn sonolastic ( or equilavant ) protected by pvc dimpleboard ( miradrain ) leading down to 4" perf pipe in a filtercloth lined trench cover'd by 3/4" stone,,, the spec, far's i know, is still 3mil dampproofing ( roll'd on asphalt emulsion ) not acceptable for my home 
ESPECIALLY that cold joint ! ! !
ESPECIALLY that cold joint ! ! !I gotta admit, you are a little above my pay grade here! I understand what you're saying about the rebar, perf pipe/stone for drainage, and rolled on asphalt; but the stuff about sonneborn sonolastic and dimpleboard is a little out of my league. If you could give me some more info on that it would be much appreciated!rebar as post'd,,, those of us in the waterproofing trade'd probably choose a trowel'd-on coating of sonneborn sonolastic ( or equilavant ) protected by pvc dimpleboard ( miradrain ) leading down to 4" perf pipe in a filtercloth lined trench cover'd by 3/4" stone,,, the spec, far's i know, is still 3mil dampproofing ( roll'd on asphalt emulsion ) not acceptable for my home
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