A page dedicated to all things waterstop, as used to seal joints in concrete construction. Feel free to post any comments or questions and I will answer promptly. Also visit www.jpspecialties.com to view my company and its waterstop products.
Waterstop: Quality Assurance and Installation Failures
Waterstop quality assurance specification should contain the following: Edge welding will not be permitted. Centerbulbs shall be compressed or closed when welding to non-centerbulb type. Waterstop splicing defects which are unacceptable include, but are not limited to the following: A. Tensile strength is not less than 60 percent of parent sections. B. Free lap joints. C. Misalignment of centerbulb, ribs, and end bulbs greater than 1/16 inch. D. Misalignment which reduces waterstop cross-section more than 15 percent. E. Bond failure at joint deeper than 1/16 inch or 15 percent of material thickness. F. Misalignment of waterstop splice resulting in misalignment of waterstop in excess of 1/2 inch in 10 feet. G. Visible porosity in the weld. H. Charred or burnt material. I. Bubbles or inadequate bonding. J. Visible signs of splice separation when cooled splice (24 hours or greater) is bent by hand at a sharp angle. Below is a gallery of waterstop installation failures.
Additional waterstop installation guides can be found here.