If leaks are suspected at interior drains, insure the drain is free flowing. Then check the drain bowl from the underside of the deck to determine if plumbing parts are cracked. Then check to see if condensation is a problem, or if the plumbing joints are leaking. If no problems are evident, inspect membrane to drain bowl interface for problems. Then check clamping ring bolts and snug down in sequence to tighten clamping rings.

If the leaks persist – remove the drain clamping ring. Repair or replace all drain parts that are missing or are broken. Drilling and retapping of drain bolts and receivers may be necessary. Next cut back and remove existing membrane flashing. Then remove the sheet lead flashing.

Then set a new sheet lead. Install the same type and number of flashings that were removed. Reinstall the clamping ring and secure the bolts by tightening them in alternating sequence. Then, you may choose to recoat the flashing with a coating that is compatible.