Compositions and methods for coating surfaces

Abstract

An exterior building cladding system and methods of applying the building cladding system are described. The system is a weather resistive barrier and decorative system that is particularly effective as a covering system for buildings having an exterior wood substrate. The system includes a flexible waterproof base layer of acrylic and rubber that is adhered directly to a wood substrate, a mesh embedded in the flexible waterproof base layer and an acrylic stucco outer layer adhering directly to the flexible waterproof base layer. The system eliminates the need for building wrap while providing a moisture resistant and vapour permeable layer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from Canadian Patent Application No. ______ filed on Aug. 13, 2009, entitled “Compositions and Methods for Coating Surfaces”, the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]An exterior building cladding system and methods of applying the building cladding system are described. The system is a weather resistive barrier and decorative system that is particularly effective as a covering system for buildings having an exterior wood substrate. The system includes a flexible waterproof base layer of acrylic and rubber that is adhered directly to a wood substrate, a mesh embedded in the flexible waterproof base layer and an acrylic stucco outer layer adhering directly to the flexible waterproof base layer. The system eliminates the need for building wrap while providing a moisture resistant and vapour permeable layer.BACKGROUND OF THE INVENTION[0003]The use of stucco...

AI Technical Summary

Problems solved by technology

As stucco cladding is quite rigid and brittle, it is susceptible to cracking due to shifts in a building frame and / or foundation due to natural settling, and / or due to expansion or contraction of building components caused by temperature and humidity changes.

Being made from cement and sand, stucco cladding is quite porous and is easily penetrated by water, especially if cracks are present in the stucco.

However, surface cracking in acrylic-based finish coats is not completely eliminated and water penetration is still possible.

As water penetration can lead to costly water damage to the building cavity, modern buildings also include a vapour-permeable, water-resistant barrier wrapped around the entire exterior building surface beneath the stucco layer.

As with wood surfaces, stucco does not readily adhere to building wraps, with the result being that a mesh or lath is generally required to be fastened to the exterior of the building wrap by means of fastening devices such as nails or staples.

The use of fastening devices creates small puncture holes in the building wrap that increases the susceptibility of the building wrap to water leakage, defeating the purpose of the building wrap.

If water does get underneath the building wrap, it often becomes trapped between the building wrap and the underlying substrate, which can lead to mold and mildew problems that can damage the building structure and lead to other problems.

As a result, the application of stucco as an exterior cladding on wood substrate structures can be a time-consuming, labor-intensive process due to the myriad of layers that are required to prevent moisture penetration into the building structure.

This generally results in pre-fabricated rolls or sheets of composite products that are bulky, heavy, and awkward to install, requiring a large labor component for their installation.

Once they are installed, the numerous joints between the sections must be sealed and / or the product must be installed with sufficient overlap between the sections to decrease the chance of water penetration at the joint, however this increases the amount of product that must be used.

As well, the pre-fabricated products are susceptible to damage during the transportation and handling of the products prior to installation.

Images