Cotney Consulting Group Canada reposted this
🧱 Laps & Splices: Where Good Roofs Fail First ⚠️ Most modified bitumen leaks don’t start in the field—they start at the lap. Fishmouths and voids may look minor, but they’re the fastest path to water intrusion. Here’s the correct field repair sequence: • Cut the fishmouth or void cleanly with a hook blade so the membrane can lay flat • Remove dirt and debris and inspect the area for water infiltration • If moisture is present, open the membrane and replace any wet insulation or damaged deck • Thoroughly clean and prep the repair area beyond the defect for proper tie-in • Remove embedded aggregate and smooth the surface as needed • Prime lightly—enough to support adhesion without saturating the membrane • Cut a like-material patch at least 8" larger than the defect and round all corners • Install using hot asphalt (SBS), cold adhesive, or heat welding per manufacturer requirements • Apply firm, even pressure to fully bond the patch If the lap isn’t sealed, the system isn’t sealed. File this one away—small details prevent big leaks. #LapsAndSplices #ModifiedBitumen #RoofRepairs #CommercialRoofing #ServiceRoofing #FieldTraining #RoofMaintenance