Coating Method and Coated Articles
The present invention provides an improved uncoupling membrane for use between a top coat of mortar in which a tile layer is set and a base coat of mortar applied to a substrate surface. The membrane being of the type including a dimpled plastic layer, the dimples defining, on one side of the membrane, a number of depressions into which the top coat extends in use and, on the other side of the membrane, a number of protuberances. The improvement may include a polymeric coating overlying the plastic layer and to which the top coat of mortar adheres in use.
1 . An improved uncoupling membrane for use between a top coat of mortar in which a tile layer is set and a base coat of mortar applied to a substrate surface, the membrane being of the type including a dimpled plastic layer, the dimples defining, on one side of the membrane, a plurality of depressions into which the top coat extends in use and, on the other side of the membrane, a plurality of protuberances, the improvement comprising:
a polymeric coating overlying the plastic layer and to which said top coat of mortar adheres in use.
2 . An improved membrane according to claim 1 , wherein the coating is elastomeric.
3 . An improved membrane according to claim 2 , wherein the coating is a latex.
4 . An improved membrane according to claim 2 , wherein the coating is a styrene butadiene block polymer.
5 . An improved membrane according to claim 3 , wherein the coating is a layer of the compound sold by Flextile Inc. of Toronto, Canada under the stock number WP980.
6 . An improved membrane according to claim 1 , wherein the membrane further includes a mat secured to the protuberances to define, between the mat and the plastic layer, void space separating the protuberances from one another.
7 . An improved membrane according to claim 6 , wherein, in use, the void space is substantially free of mortar and the depressions are substantially fully occupied with mortar.
8 . A method for rendering a plastic surface amenable to bonding with mortar, the method comprising the steps of:
applying to said plastic surface a coating of a styrene butadiene block copolymer allowing the coating to cure, at least in part, into an elastomer.
9 . A method according to claim 8 , wherein the coating is sprayed.
10 . A method according to claim 9 , wherein the coating is sprayed with an airless sprayer.
11 . A method according to claim 10 , wherein the coating is sprayed with a 615 spray tip.
12 . A method according to claim 11 , wherein the coating is applied at a rate of 15-20 ml per square foot of plastic surface.
13 . A method according to claim 8 , wherein the coating is the compound sold by Flextile Inc. of Toronto, Canada under the stock number WP980.
14 . An improved uncoupling membrane for use between a top coat of mortar in which a layer of hard surface covering material is set is set, the hard surface covering material being selected from tile and stone; and
a base coat of mortar applied to a substrate surface, the membrane being of the type including a dimpled plastic layer, the dimples defining, on one side of the membrane, a plurality of depressions into which the top coat extends in use and, on the other side of the membrane, a plurality of protuberances, the improvement comprising:
a polymeric coating overlying the plastic layer and to which said top coat of mortar adheres in use.