More C The following materials shall be used: metal plaster bases—expanded metal lath and wire laths; accessories—steel, PVC plastic, zinc alloy, and cornerite; channels—external corner reinforcement and foundation weep screed; wire; rod and strap hangers; clips; fasteners—nails and screws. Hangers and cold-rolled channel main runner shall conform to the allowable spacing and spans, respectively. The following methods are discussed: installation of hangers for suspended ceilings under wood constructions, attachment of hangers to main runners, installation of main runners, installation of cross furring, metal furring for walls, lapping of metal plaster bases, spacing of attachments for metal plaster bases, application of metal plaster bases, and application of accessories.
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This document is not all inclusive and does not cover all the requirements for compliant installation of stucco. This document is meant to be used as a guide to address some of the common installation and proper application issues found during field inspections.
Stucco Installation Over Masonry: Conventional stucco over masonry surfaces may be applied with two or three coats. In lieu of a bonding agent, a dash coat, roughing the surface, or metal lath are also acceptable methods for bonding. FBC In addition, if the nails are to be trimmed flush and left in place, they need to be corrosion resistant as would be required for lath or other metal accessories, ASTM C section 5.
Stucco Installation Over Wood: Conventional stucco over wood should always be applied as a three-coat system. The scratch coat must be scored horizontally on vertical surfaces. Successive coats should be applied as soon as possible after the underlying coat has sufficient strength and rigidity to resist damage when the next coat is applied. A mist cure shall be maintained as needed for climatic conditions.
Where cement plaster stucco is to be applied to lath over frame construction, measures shall be taken to prevent bonding between the cement plaster and the water resistive barrier. A bond break shall be provided between the water resistive barrier and the cement plaster stucco consisting of one of the following: 1.
Two layers of an approved water resistant barrier material, or 2. One layer of an approved water resistant barrier over an approved plastic house wrap, or 3. Lathing shall be connected to the framing members 7 inches on center. Lath shall be attached to horizontal wood framing members with 1. Lapping of metal plaster base. Side laps shall be secured to framing members. They shall be tied between supports with wire at intervals not more than 9 inches. Where end laps occur between the framing members, the ends of the sheets shall be laced or wire tied.
Maximum on center spacing of framing members shall be no more than 24 inches. Lath weight should be minimum 2. Lath accessories shall have perforated or expanded flanges, to permit complete embedment in the plaster, and be designed to receive the specified thickness of plaster. Accessories include control joints, expansion joints, corner bead, casing bead plaster stop , cornerite, weep screed, etc. Control joints expansion and contraction shall be installed in walls to delineate areas not more than sq.
The ASTM standard requires the paper to be installed, continuous, behind the joint material and that lath shall not be continuous through control joints, but shall be stopped and fastened wire tied on each side of the control joint. Control joints must be continuous through decorative bands or other embellishments, so they will not restrict panel movement.
Typical locations for control joints would include: off corners of windows, structural plate lines expecting minimal movement and junctures of dissimilar substrates. Typical locations for expansion joints would include: structural plate lines expecting significant movement and at structure expansion joints. Accessories and end laps of metal lath, where they occur between framing members, may be stapled or nailed to the substrate or wired; 9 inches on center for end laps and 18 inches on center for accessories.
At the intersections of vertical and horizontal control joints, the horizontal control joint shall be cut to fit and butted to the continuous, uninterrupted, vertical control joint. Embed all accessory ends, angles, butts, and intersections in sealant at time of installation. In wood-frame construction, accent features foam, accent strips, banding, and trim should be installed over the brown coat, using adhesive and minimum fasteners penetrating the stucco.
See Recommended Practice Section Alternative methods: accent features applied directly over metal lath 1. Accent features may be installed directly over metal lath when they are properly flashed or the WRB and lath extend over the top section of the accent feature.
Accent features may be installed directly over metal lath when they are isolated from the stucco as prescribed in ASTM C , Sec. This method may require a renewable backer-rod and sealant joint. A proprietary detail, using synthetic stucco and reinforcing mesh. See below: A foundation weep screed shall have a sloped, solid, or perforated, ground or screed flange to facilitate the removal of moisture from the wall cavity and vertical attachment flange not less than 3.
The bottom edge of the weep screed is placed not less than 1 inch below the joint formed by the foundation and framing. The water resistive barrier and lath shall entirely cover the vertical attachment flange and terminate at the top edge of the nose or ground flange. Raw earth, grade shall be not less than 4 inches below the nose of the weep screed, paved surfaces shall be not less than 2 inches below the nose of the weep screed. Roof lines shall be not less than 2 inches below the stucco termination.
It is raised off the concrete and aligned with the face of the foundation. Care must be taken to construct foundation walls straight and true. Requires flashing or other approved drainage system similar to the detail above , installed as required by section R One-piece and two-piece accessories are available to meet this requirement.
Separation shall be provided where stucco plaster abuts dissimilar materials, openings, and fenestration products and the juncture shall be sealed with sealant. See FBC-R The weather-resistant barrier WRB , bond-break, lath, and stucco shall be installed to the top of the wall top plate, including behind soffits. Where walls butt into perpendicular walls, rough framing shall not contact perpendicular wall sheathing; provide sufficient space to install continuous WRB, bond-break, lath, and stucco.
The documents referenced in Section R This method of sealing joints around windows is the recommended practice. Recommended Practice: The following recommended practices, when carefully done, will provide enhanced protection against water intrusion into framed wall systems.
Installing accent features foam, accent strips, banding, and trim over a proper stucco base coat Scratch and brown coats helps eliminate a major source of moisture intrusion. This method is highly encouraged and considered Recommended Practice. Installing a strip of self-adhering flashing or self-sealing membrane under trim, banding, and lath accessories both vertical and horizontal helps protect against water intrusion where fasteners penetrate the WRB.
Self-furring, paper-back lath made with minute, Grade D paper over house wrap meets all of the requirements of the Florida Building Code. Self-furring, unbacked lath over two layers of WRB, consisting of a layer of minute, Grade D paper or better over a layer of house wrap will provide enhanced protection against water intrusion.
This guide can be read in its entirety here. Take a look at this very informative stucco installation video.
Stucco Installation, Procedures and Guidelines
This document is not all inclusive and does not cover all the requirements for compliant installation of stucco. This document is meant to be used as a guide to address some of the common installation and proper application issues found during field inspections. Stucco Installation Over Masonry: Conventional stucco over masonry surfaces may be applied with two or three coats. In lieu of a bonding agent, a dash coat, roughing the surface, or metal lath are also acceptable methods for bonding. FBC In addition, if the nails are to be trimmed flush and left in place, they need to be corrosion resistant as would be required for lath or other metal accessories, ASTM C section 5. Stucco Installation Over Wood: Conventional stucco over wood should always be applied as a three-coat system.
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