... The lining of the Lincoln Memorial Reflecting Pool peeled away in at least seven places along seams that were created when the material was applied in large rectangular sections, indicating likely problems in how it was installed, according to a Washington Post analysis of visuals and interviews with experts. ...
Post reporters visited the Reflecting Pool on June 25 and identified seven locations where the lining " a waterproof membrane that was painted onto the concrete basin " had partially or entirely peeled away. The peeling occurred in irregularly shaped patches that stretched alongside the long edges of the pool. The pieces ranged in size from a few inches to as long as six feet. In one case, the concrete was visible underneath. (Reporters could not see the condition of the lining in the middle of the basin.)
By comparing the seven locations with satellite imagery, photos and videos taken during the renovation process, the analysis found that all of the failures occurred at the seams " lines between two areas that were painted at different times.
Four experts in waterproofing materials -- who have decades of experience and have served as educators and expert witnesses in pool-related construction lawsuits -- reviewed The Post's findings and said the failure pattern strongly suggested errors in the application process. They said that while a precise cause cannot be determined without on-site examination and lab testing, such seams require careful attention and are especially prone to failure. ...
In five of the spots, the dark blue Pipeliner 5000 coating had peeled off to reveal more of the same material. Experts said this appears consistent with an adhesion failure caused by an overlap of the dark blue over a dried layer of the same material at the seams. For any overlapping Pipeliner 5000 to adhere, the underlying layer would need to still be wet or, if not, steps would need to be taken to prepare the surface.
Pipeliner 5000 dries within four hours, according to technical documents, depending on temperature and humidity. The Post confirmed that in each of the five spots, five hours or more had elapsed between when adjacent sections were sprayed.
At a sixth spot The Post identified, the dark blue Pipeliner 5000 had peeled back to reveal the light blue Rhino 406 primer. The Pipeliner 5000 should be applied within 24 hours of the primer, according to technical specifications. Photos and a video of the renovation process showed that, at this location, it was applied more than 24 hours after the primer, which experts said made it less likely that the two materials bonded properly. ...
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