In moist (A) or marine (C) climate zones, water-resistive barrier shall comply with of one of the following: Figure 3. CM Perspective: ANSI/TPI 1 Standard: Why CMs Should Care & How to Get Involved, Parting Shots: TTT for the Next Generation. It also clarifies that the nebulous intervening “non-water absorbing layer” placed between the stucco and the WRB layer has always been intended to apply to materials like foam plastic insulating sheathing (see Section 2510.6.1 option #2 in Figure 2). This is the long-standing practice employed with anchored brick masonry veneer by use of a 1-inch air gap and vent or weep holes in the veneer. But, this also provides flexibility to use other materials like some foam sheathing products to serve as the WRB layer where approved for that purpose and also having a water-resistance equivalent to ASTM E2556 Type II.

Reservoir claddings, like Portland cement (conventional) stucco, adhered masonry veneers, and anchored brick masonry veneers to name a few, can absorb and store significant amounts of rainwater. As mentioned in a prior January 2020 EEBS article (2021 I-Codes Adopt Major Energy Efficiency & Building Science Advancements), many advancements forthcoming in the 2021 ICC family of codes (energy and building codes) were overviewed with the intent to address these advancements individually in future articles.

2510.6.1 Dry climates.


The individual layers shall be installed independently such that each layer provides a separate continuous plane and any flashing, installed in accordance with Section 1404.4 and intended to drain to the water-resistive barrier, is directed between the layers.

Editor's Message: Everything’s Changing & We Need Your Help! SBC Magazine is a publication of the Structural Building Components Association. In addition to complying with Item 2 of Section 2510.6.1, a space with a minimum drainage efficiency of 90% as measured in accordance with ASTM E2273 or Annex A2 of ASTM E2925 is added to the exterior side of the water-resistive barrier.

Thus, for all other sheathing materials (regardless of their moisture sensitivity) the only thing the code continues to require is a WRB behind the stucco (without a drainage space) in any climate and irrespective of the amount rain or moisture hazard. Use long strokes, knife swaths and other techniques to give the stucco … Finally, in rainy climates, it is important to provide at least a small drainage gap and pathway to efficiently remove bulk water from rain intrusion through the reservoir cladding which would otherwise add to the inwardly-driven water vapor load. SBC Magazine appreciates your input, and continually seeks to improve the value it provides to the market. Example of a stucco application variation with foam sheathing WRB layer and a separate non-water absorbing (bond break) layer over the foam sheathing (NOTE:  In “moist” and “marine” climates, a means of positive drainage is additionally required for all stucco applications per Section 2510.6.2 of Figure 3). The 2021 editions of International Building Code (IBC) and International Residential Code (IRC) have effectively responded. Powered by BizBudding Inc, Building a Dry Stack Block Wall with QUIKWall | Video, How to Build an Outdoor Bar with Concrete Block | Video, Cheap Wall Coverings: Ideas for low cost decor, Repairing Cracks and Holes in Stucco | Video, Bedrooms into a Master Suite, Wallpaper Removal, Entry Door Innovations and More, Staple Gun Tips, Best Buy in Fiberglass Entry Doors, Installing Basement Toilets and More, Home Improvement Tips & Advice: Show #0818082, How to Increase Space in a Small Bathroom, Microwave Safely, Chemical Free Grill Cleaning Products that Work, How to Organize Your Desk and more, Picking Pet Proof Home Improvements #0604181. It must be applied to a structurally sound wall made of concrete blocks, wood or other sturdy material. It’s one of the oldest types of siding material in the world. Consequently, some enhanced practices are necessary to protect the moisture-sensitive portions of the wall assembly from wetting due to inward vapor drives. In addition to complying with Item 1 or 2 of Section 2510.6.1, a minimum 3/16 inch (4.8 mm) space shall be added to the exterior side of the water-resistive barrier. Click to enlarge. QUIKRETE Base Coat Stucco with Water-Stop, 80 lb QUIKRETE Crack Resistant Concrete Mix, Enter The Money Pit’s $3,500 Riverbend Home Beautiful Bath Sweepstakes, Simple Steps to Create a Zero-Carbon Home | Video. If you have any comments or corrections on this article, please email us and we can publish your comments. What is stucco? This can result in elevated exterior sheathing moisture contents, and for buildings that are air-conditioned in the summer, condensation on the interior vapor retarder or high moisture contents in interior finishes. Figure 4. Visit our subscription preferences page to subscribe to Industry News or manage your email subscriptions. Best Heaters for a Garage: Forced Air, Infrared or Portable? Climate Zone Map (also to be updated for the 2021 I-Codes) Click to enlarge. U.S. The water-resistive barrier shall be separated from the stucco by a layer of foam plastic insulating sheathing or other non-water absorbing layer. Stucco is a finish, not a building material. Basement Waterproofing Tips | How to Fix a Wet Basement. Well, here’s the first installment and it addresses some very useful improvements and clarifications made to the Portland Cement stucco water-resistive barrier (WRB) provisions. For additional information, visit Continuous Insulation's Water Vapor Control web page. In fact, stucco was widely used in ancient … In both cases, as a WRB layer or as an intervening “non-water absorbing” layer, the foam sheathing also serves as a “block” or retarder to inward water vapor movement from the stucco. In a traditional successful approach, the reservoir cladding is back-ventilated to help remove the water vapor being driven inward as the cladding attempts to dry both inward and outward (see Figure 1). It should be noted, however, that the above provisions only apply where wood-based sheathing is used on the exterior side of a wall supporting the stucco (consistent with prior editions of the IBC and IRC). This gap also allows for what is known as “hygric re-distribution” (for more information please refer to see BSC article: “Drain the Rain, On the Plane. Apply the stucco to the wall with a trowel to a thickness of 1/8 inch. Building a stucco garden wall is a project that will take a couple …
Episode #2041: Easy 1-Weekend Projects | Hassle Free Yard Cleanup | Colorful Wall Coverings | Best Flooring by Room, Episode #2040: Deer-Proof Landscapes | Draft-Stopping Window Shades | Hacks to Stop Wall Cracks, Episode #2039: Best Paint Colors for Home Value | Bright Choices for Bath Lighting Avoiding Hidden Costs for Home Remodels, Episode #2038: Switching to Fall Vegetable Gardens | Simple Energy Saving Solutions | Best Water Filters | Garage Organization for Fall, Episode #2037: Small Bath Solutions that Add Space | Kitchens that Cut Cleaning Time | Safer Space Heaters | Tips for First Time Renters. Originally published by the following source: SBC Magazine — March 6, 2020 by Jay Crandell, P.E., Applied Building Technology Group.

Check out this extra section in each digital issue of SBC Magazine for additional news, perspective, and advertiser content. One of the following shall apply for dry (B) climate zones: 2510.6.2 Moist or marine climates.

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In another successful approach commonly used with stucco, inwardly-driven water vapor can be blocked by placing an “intervening layer” of low vapor permeance “non-water absorbing” material between the reservoir cladding and the remainder of the wall assembly. The 2021 IBC and IRC code improvements to address the above principles are shown in Figure 2 below (only the IBC text is shown; the IRC text is identical). Learn more and access 2016-2017 archives here.

First, they allow traditional practices to be continued where they have been successful in the “dry” climate zones (see Section 2510.6.1 in Figure 2 and Figure 3 for the “dry” climate region). Stucco can be applied over standard, wood frame walls in a three-coat process and over masonry and poured concrete walls in a two-coat application. Sean Shields contributed to this article. Inward Moisture Movement Due to Reservoir Cladding and Solar Radiation. When solar-driven drying occurs after a rain event, the inward vapor drives can readily exceed the magnitude of outward vapor drives experienced during the winter (see Figure 1).

Your email address will not be published. Example of a stucco application variation with foam sheathing WRB layer and a separate non-water absorbing (bond break) layer over the foam sheathing (NOTE: In “moist” and “marine” climates, a means of positive drainage is additionally required for all stucco … The Drainage Plane, continually seeks to improve the value it provides.