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Section 2510 Lathing and Furring for Cement Plaster (Stucco)
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Exterior and interior cement plaster and lathing shall be done with the appropriate materials listed in Table 2507.2 and Chapter 35.
Materials shall be stored in such a manner as to protect them from the weather.
Installation of these materials shall be in compliance with ASTM C926 and ASTM C1063.
Metal lath and lath attachments shall be of corrosion-resistant material.
Where lath on vertical surfaces extends between rafters or other similar projecting members, solid backing shall be installed to provide support for lath and attachments.
Gypsum lath or gypsum wallboard shall not be used as a backing for cement plaster.
Exception: Gypsum lath or gypsum wallboard is permitted, with a water-resistive barrier, as a backing for self-furred metal lath or self-furred wire fabric lath and cement plaster where either of the following conditions occur:
- On horizontal supports of ceilings or roof soffits.
- On interior walls.
Gypsum sheathing is permitted as a backing for metal or wire fabric lath and cement plaster on walls. A water-resistive barrier shall be provided in accordance with Section 2510.6.
Wire backing is not required under expanded metal lath or paperbacked wire fabric lath.
Water-resistive barriers shall be installed as required in Section 1403.2 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 water-resistive barrier complying with ASTM E2556, Type I. 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) intended to drain to the water-resistive barrier is directed between the layers.
Exceptions:
- Where the water-resistive barrier that is applied over wood-based sheathing has a water resistance equal to or greater than that of a water-resistive barrier complying with ASTM E2556, Type II and is separated from the stucco by an intervening, substantially nonwater-absorbing layer or drainage space.
- Where the water-resistive barrier is applied over wood-based sheathing in Climate Zone 1A, 2A or 3A, a ventilated air space shall be provided between the stucco and water-resistive barrier.
Surfaces shall be clean, free from efflorescence, sufficiently damp and rough for proper bond. If the surface is insufficiently rough, approved bonding agents or a Portland cement dash bond coat mixed in proportions of not more than two parts volume of sand to one part volume of Portland cement or plastic cement shall be applied. The dash bond coat shall be left undisturbed and shall be moist cured not less than 24 hours.
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Section 2510 Gypsum Board, Gypsum Panel Products and Plaster, Lathing and Furring for Cement Plaster (Stucco)
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Building Code 2021 of Illinois > 25 Gypsum Board, Gypsum Panel Products and Plaster > 2510 Lathing and Furring for Cement Plaster (Stucco)
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