Cement board wall system

Abstract

A system comprising an inner cement wall board, an outer cement wall board, and a cement or concrete compatible adhesive formed between the fluid-applied water-resistive barrier and the outer cement wall board, wherein the cement or concrete compatible adhesive forms drainage channels between the inner cement wall board and the outer cement wall board.

Description

FIELD OF THE INVENTION[0001]This present invention relates generally to exterior wall board systems used in the construction of residential and / or commercial buildings that provide a water-resistive barrier and shear strength, and more particularly to a cement wall board system.BACKGROUND OF THE INVENTION[0002]Building codes today require that certain walls of wood or steel framed buildings be capable of taking shear loads. Typically, ⅜ inch to ⅝ inch wood-based sheathing have been installed on the interior or exterior side of the framing studs to take such shear loads. It is common practice to install ½ inch to ⅝ inch thick drywall panels, such as gypsum wallboards, on the interior sides of the framing studs and a ⅞ inch stucco system or other suitable material with a water-resistive barrier on the exterior side of the framing studs.[0003]In general, most wall board systems used in construction are susceptible to water and moisture intrusion, which can cause water damage and corros...

AI Technical Summary

Benefits of technology

[0009]At least one embodiment of the present invention is directed towards a novel exterior cement wall board system that can provide shear strength, protection from water / moisture damage without using any wood-based sheathing and / or building paper or any other component that can suffer from water damage. Specifically, at least one embodiment of the present invention combines drainage channels with a structural board such as a cement board. In at least one embodiment, this is done by forming the cement or concrete compatible adhesive with the proper thickness and spacing behind the cement board. The cement board system does not require any metal lath, wood-based sheathing and / or building paper or any other component that can suffer from water damage. The system also reduces construction time, minimizes clean up, and is more durable than other exterior wall systems such as an EIFS.

Problems solved by technology

In general, most wall board systems used in construction are susceptible to water and moisture intrusion, which can cause water damage and corrosion.

Internal (hydration) cracks and external (stress) cracks, which can form as a result of installation error or building movement, can increase the amount of damage caused by the water intrusion.

Specifically, wood-based sheathing, lath and organic water-resistive barriers (such as building paper), which are used in typical stucco systems, are particularly susceptible to corrosion caused by water.

In both the one-coat and three-coat systems described above, water can infiltrate the stucco layers, which can cause corrosion of the lath, water-resistive barrier, and wood-based sheathing.

Some of the disadvantages of an EIFS 300 are that it does not provide sufficient shear force resistance and its inherent frailty would make it less durable and more susceptible to damage from exterior forces when compared to other cement-based, masonry-based, or wood-based wall systems.

For example, naturally occurring solar heat may melt the EPS foam causing it to prematurely delaminate and the lower (reachable) surface may be prone to exterior impact damage. ]

Another problem with the aforementioned wall board systems is that the system is complicated and produces a lot of waste materials, which makes clean up more burdensome.

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