Hybrid stucco system

Abstract

A hybrid stucco system includes a substrate, a weather barrier membrane, a polyisocyanurate board, an alkali resistant fiberglass mesh, a base coat, and a finish coat. The polyisocyanurate board is a high-density, closed-cell, rigid foam insulation board having a high R-value. The alkali resistant fiberglass mesh, in some examples, features a zirconia content of at least 19%. The alkali resistant fiberglass mesh may be pre-lathed onto the polyisocyanurate board during manufacture or otherwise coupled together by wide crown staples prior to entering the field. The base coat includes portland cement, acrylics, fibers, pozzolans, silica sands, and pumice. The base coat features a consistency that is easily applied to the alkali resistant fiberglass mesh and cures smoothly within one hour, in preparation to receive the finish coat.

What is claimed is: 
     
         1 . A hybrid stucco system, comprising:
 a substrate;   a polyisocyanurate board;   an alkali resistant fiberglass mesh;   a base coat; and   a finish coat.   
     
     
         2 . The hybrid stucco system of  claim 1 , wherein the substrate is plywood or oriented strand board. 
     
     
         3 . The hybrid stucco system of  claim 1 , wherein the polyisocyanurate board is a closed-cell, rigid foam board. 
     
     
         4 . The hybrid stucco system of  claim 3 , wherein the polyisocyanurate board has a density rated at or above 80 PSI. 
     
     
         5 . The hybrid stucco system of  claim 1 , wherein the alkali resistant fiberglass mesh is pre-lathed onto the polyisocyanurate board prior to installation. 
     
     
         6 . The hybrid stucco system of  claim 1 , wherein the base coat comprises portland cement, acrylics, fibers, pozzolans, silica sands, and pumice. 
     
     
         7 . The hybrid stucco system of  claim 1 , wherein the finish coat comprises elastomeric compounds. 
     
     
         8 . The hybrid stucco system of  claim 7 , wherein the elastomeric compounds comprise an acrylic polymer or silicone-modified acrylic. 
     
     
         9 . The hybrid stucco system of  claim 8 , wherein the elastomeric compounds further comprise colorants, minerals, and aggregates. 
     
     
         10 . A hybrid stucco system, comprising:
 a substrate comprising plywood or oriented strand board;   a polyisocyanurate board comprising closed-cell, rigid foam having a density rated at or above 80 PSI;   an alkali resistant fiberglass mesh coupled to the polyisocyanurate board prior to installation;   a base coat comprising portland cement, acrylics, fibers, pozzolans, silica sands, and pumice; and   a finish coat comprising an elastomeric compound.   
     
     
         11 . The hybrid stucco system of  claim 10 , wherein the elastomeric compound comprises an acrylic polymer or silicone-modified acrylic. 
     
     
         12 . The hybrid stucco system of  claim 10 , wherein the elastomeric compound further comprises colorants, minerals, and aggregates. 
     
     
         13 . A method of installing a hybrid stucco system, comprising:
 installing a weep screed and a weather barrier membrane to a substrate;   installing a polyisocyanurate board, the polyisocyanurate board comprising an alkali resistant fiberglass mesh coupled thereto and facing away from the framing;   securing the polyisocyanurate board to the substrate using mechanical fasteners;   applying a base coat to the alkali resistant fiberglass mesh and polyisocyanurate board;   applying water to cure the base coat;   applying a finish coat to the base coat.   
     
     
         14 . The method of  claim 13 , wherein after the step of securing the polyisocyanurate board to the substrate using mechanical fasteners, securing an alkali resistant glass fiber joint aid to joints of the polyisocyanurate board. 
     
     
         15 . The method of  claim 13 , wherein after the step of securing the polyisocyanurate board to the substrate using mechanical fasteners, securing a joint aid to corners of windows, doors, and other openings. 
     
     
         16 . The method of  claim 13 , wherein the base coat is ¼ inch thick and applied using a darby, float, or other hand implement to evenly spread the base coat within dips and recesses. 
     
     
         17 . The method of  claim 13 , wherein the polyisocyanurate board is a closed-cell, rigid foam board. 
     
     
         18 . The method of  claim 13 , wherein the polyisocyanurate board has a density rated at or above 80 PSI. 
     
     
         19 . The method of  claim 13 , wherein the alkali resistant fiberglass mesh comprises at least 19% zirconia. 
     
     
         20 . The method of  claim 13 , wherein the mechanical fasteners are wide crown staples.