A continuous connection made on site to join two separate pieces of roofing or waterproofing membrane. Depending on the material, workers create these joints using hot-air welding, solvent welding, splicing tape, or liquid adhesives. They are the most common points of failure in sheet membrane systems.
Heard on the job
Make sure you probe every inch of that field seam before the inspector gets here.
Insider tip
Always clean the lap areas thoroughly before creating a field seam, as dust and moisture are the main culprits for seam failure.