Back to results
US 5,376,429 AGranted
Laminated waterstop using bentonite and bentones
AssigneeParamount Technical Products, Inc.
InventorPatrick J. McGroarty
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeParamount Technical Products, Inc.
InventorPatrick J. McGroarty
Estimating the term…
A laminated waterstop strip used in the construction of buildings that is placed on the top of a surface of a hardened concrete layer of footing, prior to pouring of an additional layer, and is made to have a number of granular layers held with adhesive between each of the layers, and having in the range of 30 to 60 individual granular layers so that the waterstop has a height of in the range of one-half to one inch. The waterstop strip is made up of bentonite granules, preferably, which are adhered to a fabric layer for support, an adhered layer on the exterior of the fabric layer, with a quick release paper on the exterior of the fabric layer. A light weight, synthetic fiber mesh for providing weather resistance, tear resistance, and retention properties is placed over the upper layer of particles. The waterstop strip is made in a batch process before being cut into strips by utilizing a reciprocating multi-station adhesive and particle dispensing carriage that will move back and forth across a desired size sheet of fabric until the number of layers of particles and adhesives have been built to the desired level and the adhesive forms an elastomeric matrix to retain the particles together.
A waterstop strip comprising a base sheet of open mesh porous flexible material, supporting a layer consisting essentially of:
A narrow, elongated liquid stop strip for interspersing between portions of building material consisting essentially of an open mesh porous base layer having adhesive deposited over the mesh and extending through to the exterior to provide an exposed adhesive surface, a plurality of individual layers or particles which hydrate and swell in the presence of liquid and which dehydrate as the liquid dries, and adhesive layers alternately formed with particle layers over the mesh base layer to form a matrix of adhesive between particles and the individual layers of particles, the adhesive and particle layers being built up to a thickness to provide waterproofing between the portions of building material, an overlying open mesh layer on a surface of said built up layers of particles opposite from the base layer, said liquid stop strip having substantial interstitial spaces which are filled with air to permit compressing the strip under exterior forces while being held together by the matrix of adhesive, the adhesive comprising elastomeric solids which remain flexible and hold the particles together during repeated hydration and dehydration.
Dependencies are inferred from the claim text.