I have some 16" pipes penetrating 8" block wall. do you guys know any special details to seal the wall? I am thinking just let the mason fill the void with grout. thanks.
If the pipe does not deflect at the wall (hard joint), but deflects away from the wall (due to flexible roof support) will it place undo stress on the pipe?
You should provide a sleeve that is about 2" larger than the pipe and place compressible joint filler around the pipe so that the pipe is not rigidly embedded in the cmu wall
If the pipe is hung from the roof, it will deflect as the roof structure deflects. If this is a metal building with long spans, the deflection could be substantial.
If the pipe thru the wall is grouted solid into the wall, it will not deflect. This is where the incompatibility comes from and can cause a pipe to break if severe enough.