Multiple sheet building wrap for use in external wall assemblies having wet-applied facades

a technology of facades and building wraps, applied in building repairs, ceilings, coverings/linings, etc., can solve the problems of preventing the transport of moisture vapor through the water resistive barrier, interfering with the drainage of liquid water through the mesh,

Inactive Publication Date: 2009-06-25
WESTON THERESA ANN +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mesh layer of these systems allows the wet-applied stucco to penetrate the mesh, thereby interfering with the drainage of liquid water through the mesh and inhibiting the transport of moisture vapor through the water resistive barrier.

Method used

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Examples

Experimental program
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Effect test

examples

[0051]The following intervening layers and mesh layers in combination with DuPont™ Tyvek® HomeWrap® (E. I. du Pont de Nemours & Co., Wilmington, Del.) as the WRB layer were tested for stucco penetration. Control samples did not include a mesh layer. Building wraps which received a stucco penetration rating of greater than 5 were deemed to be suitable for use as building wrap. As can be seen from Table 1, acceptable stucco penetration was obtained in all of the following example combinations and not in the control samples.

[0052]The slump level of the stucco is an indication of the moisture content of the stucco mixture, as determined by ASTM C143.

TABLE 1Stucco Penetration for Manually Applied StuccoStuccoStucco SlumpPenetrationExample No.(in)Intervening LayerMesh LayerRating16.5Xavan ® SBPP 2.6 osyEnkamat ® 50069(DuPont)nylon mat(Colbond)26.5Typar ® SBPPEnkamat ® 70049landscape fabric 2.0nylon matosy (DuPont)(Colbond)36.5Spunbond PE / PETEnkamat ® 70049(50 / 50)-Meltblownnylon matPE / PET ...

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Abstract

A multiple sheet building wrap for wrapping the structural components of a building in order to protect the underlying structural components and optional building sheathing from moisture is provided. The building wrap is particularly useful under facades such as wet applied stucco or engineered stone, demonstrating good drainage of liquid water and moisture vapor permeability. The building wrap is a composite of a water resistive barrier, a three-dimensional mesh layer and a porous intervening layer which acts to filter the stucco as it is applied. An exterior wall construction incorporating such building wrap is also provided.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a building wrap for wrapping the structural components of a building in order to protect the structural components and optional building sheathing from moisture.[0003]2. Description of the Related Art[0004]Two sheets of a water resistive barrier (“WRB,” also commonly referred to as “weather-resistive barrier” or “house wrap”) material are known for use as a building wrap under facade materials such as three-coat stucco or traditional Portland cement which are applied wet, e.g., using a trowel or by spraying. For instance, such building wraps can include two layers of Grade D building paper, two layers of asphalt-saturated kraft paper, two layers of building felt, two layers of a conventional polymeric house wrap, or one layer of building paper combined with one layer of polymeric house wrap. Known polymeric house wraps for use as WRBs include, for example, spunbond polyethylene sheet ava...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04F13/04E04B1/66E04F13/077
CPCE04F13/04E04B1/625
Inventor WESTON, THERESA ANNO'ROURKE, BARBARA KLIMOWICZKNOFF, WARREN FRANCISNOBBEE, WAZIRBOONE, KIMDOLYN
Owner WESTON THERESA ANN
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