Rubber mats are almost always required when on a membrane roof. Not used if on gravel/rocks. Please no protruding bolt heads, the bottom of a nprm needs to be FLAT.
roofs like this: https://www.google.ca/search?q=white+membrane+roofing&num=100&prmd=ivsn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiMgba8x6TKAhXGLmMKHRVGAgcQ_AUIBygB&biw=360&bih=559&dpr=3 On Jan 11, 2016 10:37 AM, "Chuck McCown" <[email protected]> wrote: > If the mount has the head of a carriage bolt coming though on the bottom, > will this be a problem? Now smooth does the bottom want to be? Are weld > beads OK. > > Do you always use rubber mats under them? >
