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Summary: IBC Code Section 2510.6 Changes

IECCmap Revised A and C Map WEB 01This map indicates three major climate zones for the U.S.: A: Moist, B: Dry, C: Marine. The major code change is for the highlighted Zones A (Moist) and C (Marine).The 2021 International Building Code (IBC-2021), Section 2510.6, was recently updated reflecting changes in Water Resistive Barriers (WRB) selection for stucco over wood-based sheathing.

The major code change is for Zones A (Moist) and C (Marine). Now required is ONE of the following:

  • Option 1: 3/16” (4.8mm) drainage cavity over the WRB when stucco is applied on wood-based sheathing such as OSB and plywood
  • Option 2: Minimum drainage efficiency of 90 percent as measured by ASTM E2273 or Annex A2 of ASTM E2925

 

 

 

 

Vaproshield Solutions For Zones A and C

VS Solutions Image 1 01Rainscreen SA air barrier WRB with 7mm drainage matrix will satisfy BOTH options for Zones A and C. The aggressive adhesive bonds to multiple substrates including OSB and the built-in 7mm drainage matrix allows for one-step installation of the: air barrier, WRB and required 3/16” (4.8mm) drainage cavity or minimum drainage efficiency of 90%.VS Solutions Image 2 01Two rainscreen drainage matrix options: 7mm and 3mm work with stucco, siding, and stone. The 3mm offers a cost-effective option meeting the minimum drainage efficiency of 90 percent, as outlined above Option 2.

 

 

 

 

 

 

 

 

 

 

Rainscreen SA Benefits

  • Factory-bonded drainage matrix (3 or 7mm) maintains an unimpeded vertical drainage plane behind the stucco façade
  • Simplified installation with all-in-one membrane and fully tested rough opening flashing system
  • Applies in below freezing 20°F (-6°C) temperatures
  • Six months UV and weather exposure eases concerns of supply chain delays
  • Air barrier and WRB with high drying capacity, 25 perms

Rainscreen Benefits Image 01Rainscreen SA combined with Stockton Products™ new Tru-Weep™ single step installation counter flashing stucco screeds allow water to efficiently exit the stucco assembly and provide best practice installation.

 

 

 

 

 

 

 

 

 

 

Summary Zone B: Dry Climates

IECCmap Revised B Map WEB 01The highlighted Zone B (Dry) had minor code updates offering four options.The changes for Zone B, dry climate, are not as drastic as Zones A and C however there are a few noteworthy details. ONE of the following shall apply for dry (B) climate zones:

  • Option 1: Two layers of 10-minute Grade D paper or greater
  • Option 2: Two layers of water-resistive barrier complying with ASTM E2556, Type 1
  • Option 3: Water-resistive barrier shall be 60-minute Grade D paper
  • Option 4: Water-resistive barrier shall have a water resistance equal to or greater than one layer of water-resistive barrier complying with ASTM E2556, Type II

Additionally, options 3 and 4 the WRB must be separated from the stucco by ONE of the following:

  • Foam Plastic
  • Another non-water absorbing layer
  • Drainage space

Vaproshield Solutions Compliant to IBC 2021 Section 2510.6 Water Resistive Barriers

VaproShield Membrane Solutions
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Moist and Marine
2510.6.2 Option 1
3/16” (4.8mm) drainage cavity
IECCmap Revised A and C Map WEB 01

Moist and Marine
2510.6.2 Option 2
Minimum drainage efficiency of 90%
IECCmap Revised A and C Map WEB 01

Dry Climate
2510.6.1 Options 1-4
IECCmap Revised A and C Map WEB 01

VS Rainscreen 3mm   Green X 01 Green X 01
VS RainScreen 7mm Green X 01 Green X 01 Green X 01
VS PanelShield VaproMat 3mm   Green X 01 Green X 01
VS PanelShield VaproMat 7mm Green X 01 Green X 01 Green X 01
VS WrapShield VaproMat 3mm   Green X 01 Green X 01
VS WrapShield VaproMat 7mm Green X 01 Green X 01 Green X 01

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