R703.4 Flashing. Approved corrosion-resistant flashing shall be applied shingle-fashion in a man - ner to prevent entry of water into the wall cavity or penetration of water to the building structural framing components. Self-adhered membranes used as flashing shall comply with AAMA (Ameri - can Architectural Manufacturers Association) 711. Fluid-applied membranes used as flashing in exterior walls shall comply with AAMA 714. The flashing shall extend to the surface of the exterior wall finish. Approved corrosion-resistant flashings shall be installed at: 1. Exterior window and door openings. Flashing at exterior window and door openings shall extend to the surface of the exterior wall finish or to the water-resistive barrier complying with Section R703.2 for subsequent drainage. Mechanically attached flexible flashings shall comply with AAMA 712. R703.7.3 Water-resistive barriers. Water-resistive barriers shall be installed as required in Section R703.2 and, where applied over wood-based sheathing, shall include a water-resistive vapor- permeable barrier with a performance at least equivalent to two layers of Grade D paper. The individual layers shall be installed independently such that each layer provides a separate continuous plane and any flashing (installed in accordance with Section R703.4) intended to drain to the water-resistive barrier is directed between the layers. • Exception: Where the water-resistive barrier that is applied over wood-based sheathing has a water resistance equal to or greater than that of 60-minute Grade D paper and is separated from the stucco by an intervening, substantially non-water-absorbing layer or designed drainage space. Additional energy code requirements may dictate the exterior envelope includes an air barrier. These requirements will vary based on jurisdiction, including different requirements from county to county, so check with the local building department. These are the primary weatherization codes you’ll encounter in residential and light commercial construction. Beyond them, you may encounter reference to test methods for specific performance criteria or physical properties of materials. Typically, these tests will validate compliance with some aspect of the code and are not separate or additional to the code. So, while you may not be a code geek, we hope you feel a little more confident in your understanding of weatherization building codes. Remember, understanding codes, guidelines, and best practices is all part of ensuring that you can build at the highest quality and avoid issues.
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