11/07/2026
🧱 Laps & Splices: Where Good Welding Separates Repairs from Callbacks ⚠️
When laps or splices open up, it’s rarely the membrane—it’s the prep, cleaning, or welding sequence that failed.
Here’s the correct field process to make the repair last:
• Pull back unbonded lap material until solid adhesion is reached
• If water intrusion is suspected, open the system and replace any wet insulation or damaged deck
• Clean and prep the lap area thoroughly—no dirt, no shortcuts
• Strip in a reinforced patch (minimum 8" wide) centered over the lap
• Clean both the membrane and patch underside with approved solvent and allow to air dry
• Install using proper thermoplastic welding steps: tack weld, pre-weld, then final weld
• Roll welds while hot to ensure full fusion and eliminate voids
• Probe seams after cooling and seal reinforced edges if required
• Redistribute ballast if it was removed during the repair
Laps don’t fail quietly. They tell you exactly where the system is weakest.
File this one away—small details prevent big leaks.