I am working with an ALFI linear shower drain that requires that a rubber-gasketed, PVC flange (ALFI BRAND ABDB55 shower base drain) be installed underneath the shower pan to collect the drain water into our 2 inch PVC drain pipe. The trouble with the ABDB55 part is that it has weep holes, and ALFI specifies that it this part is "required" to be used underneath the drain pan. This means that the weep holes open into the floor cavity, and if the drain pipe ever gets clogged the only place the water can go is up through the weep holes and into that floor cavity! I have spoken to an ALFI rep who insists that this is not a design flaw and that they never have had any problems. This same shower drain base seems to also be specified (by ALFI) for use in tiled showers where the weep holes may be above the shower pan. So, I am wondering if the ALFI design team or engineers thought this through when also specifying that it be used with their linear floor drain pans? Is my thinking correct that if installed under the linear floor drain pan as specified, the weep holes would leak into the floor cavity if the drain line clogged? The ALFI rep disagreed vehemently but then just said, despite the use of the word "required" in the written instructions saying that the ALFI base drain must be used, that I could buy a different brand of base drain connector, or just plug the weep holes with caulk. Something doesn't seem right and I am worried about voiding warrantees and of course getting leaks. Suggestions?