Installers shingle laps the way roofers do: on slopes and in channels the upslope or upstream panel goes over the one below, so water and soil run across the overlap instead of getting under it. The same idea guides fill placement, which advances in the direction that presses the top layer down instead of peeling it up.
Heard on the job
Shingle the laps downhill on that swale or the first storm will lift every edge.
Also heard as
- shingling
- shingled lap
Related terms
Overlap
Width by which neighboring rolls of geotextile, geogrid or GCL lie over one another to keep a continuous layer.
Panel
One continuous piece of geomembrane as deployed, numbered and tracked through seaming and testing.
Deployment
Unrolling and positioning geosynthetic rolls in their final location before seaming or covering.