you only need to ' tar ' the foundation walls if you don't want water leaking into it :no: then again, can't imagine having a partially underground garage but haven't been in pennsylvania in yrs,,, what did your local bldg dept say/recommend ? IF you would like the wall to last longer w/o bulging, it would be helpful to pour concrete into the cells as block have MUCH less resistance to soil pressure than conc
you wouldn't be using ' tar ' in any event as that must be applied as a hot liquid,,, IF it were mine & i wanted it to last, i would use troweled-on roofing cement & protect it w/hdpe dimpleboard ( miradrain / sonneborn / meadows )
A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Helping You to Do It Yourself!