Taping overlaps in roof vapor barrier?
I’m adding insulation to the exterior of my roof. The stack will be as follows, from bottom to top:
5.5 inch Roxul in rafter bays (underside of roof)
vapor barrier (solitex mento)
3 inch poly iso
4.5 inch nailbase (Hunter panels: 3 inch poly iso, 1 inch vent gap, .5 inch osb)
Today the roofers came to start- they removed old shingles and put down the vapor barrier.
However, they did not tape the overlaps between layers of the vapor barrier. I mentioned it since I thought I’d heard it should be done, but the foreman didn’t seem to think it was necessary and didn’t seem familiar with the practice. Should I insist? If so, suggestions on what kind of tape should be used (something easily available at hardware store)?
Thanks so much,