That buildup is definitely the sign of a leak, probably from
the seal at that joint.
Not exact matches
Flat roof: 50 mm pea gravel finish on Geotextile membrane, on Resitrix EPDM single ply membrane, on 75 mm Dow Roofmate insulation, on 22 mm WBP plywood, on 200 x 50 metal web joists
at 400 centres, with 200 mm mineral wool fitted between metal web over Intello with
sealed joints, on 12.5 mm plasterboard and hardwall skim coat.
Via: Associated Press Read more about the
seal hunt at TreeHugger Supermarkets Joint Forces with Humane Society to Protect Seals Survey: Should Canada Ban the Seal H
seal hunt
at TreeHugger Supermarkets
Joint Forces with Humane Society to Protect Seals Survey: Should Canada Ban the
Seal H
Seal Hunt?
Interestingly, there does exist a drawing of a hexagonal
seal, purporting to show the
joint arms of Jane and Guildford Dudley; the initials of Guildford are
at the top and Jane's
at the bottom.