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Application
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General: Apply PermaLath® in accordance with Specifications and the following:
A. |
Acceptable substrates include Cement Board (ASTM C1325 Type A Exterior), Gypsum Sheathing (ASTM C79 or C1177), exposure 1 or better exterior grade plywood, exposure 1 OSB, poured concrete or unit masonry. Apply/install substrate per the manufacturer’s instructions and applicable building codes. Not for use over open framing.
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B. |
Secondary moisture protection barrier (Not required on unit masonry/non-insulated concrete substrates surfaces to receive the cement plaster stucco. |
1. |
Acceptable secondary moisture protection barriers include polymeric weather resistive barriers such as Tyvek® Stuccowrap® and acceptable equals that comply with and are recognized by local building codes. Grade D and other asphalt saturated building papers must not be used with systems incorporating PermaLath unless separated by a layer of expanded polystyrene insulation board (see E below). Trowel/roller applied weather barriers can be used provided a subsequent layer of a polymeric weather resistive barrier such as Tyvek Stuccowrap or equal is applied over the trowel/roller applied weather barrier. | |
2. |
Install the secondary moisture protection barrier over the substrate according to manufacturer’s specifications and applicable building code requirements. | |
3. |
The secondary moisture protection barrier shall be free of any damage such as holes or breaks, and must be applied to all surfaces to receive the cement plaster stucco. | |
4. |
Wrap the secondary moisture protection barrier into rough openings (doors, windows, etc.) to increase the level of protection to the building frame and interior. | |
5. |
Coordinate work with other trades to assure proper sequencing, detailing and installation of materials.
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C. |
Expanded polystyrene insulation board (optional)
The expanded polystyrene insulation board (2’x 8’ nominal 1.5 PCF density, tongue and groove) shall be placed horizontally with the tongue facing upward and temporarily held in place with galvanized staples, roofing nails or (metal framing) self tapping screws.
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D. |
Trim
Install trim accessories per drawings and specification.
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E. |
PermaLath |
1. |
Apply PermaLath over substrate with minimum 3" overlap at vertical and horizontal edges and overlap on flange of trim accessories. PermaLath can be applied horizontally or vertically and should be applied such that it is flat and free of ripples, wrinkles, etc. | |
2. |
Fasteners: ULP-302 (1 3/4") or Lath Plate (1 1/4") Mechanical Fastening Systems by Wind-Lock Corp. |
a. |
Masonry: masonry type [M] expansion fastener with ULP 302 diameter washer; or lath plate 25 mm (1") minimum penetration into masonry. Fastener spacing 6" o.c. vertically and 16" o.c. horizontally. | |
b. |
Light Gauge Steel Framing/Furring (20 Gauge): light metal type [LM] bugle head screws with ULP 302 (1 3/4") diameter washer or lath plate 16 mm (5/8") minimum penetration into framing 6" o.c. vertically and 16" o.c. horizontally. | |
c. |
Heavy Gauge Steel Framing (18 to 12 Gauge maximum): metal type [S] bugle head screws with ULP 302 (1 3/4") diameter washer or lath plate; 16 mm (5/8") minimum penetration to framing 6" o.c. vertically and 16" o.c. horizontally. | |
d. |
Wood framing: wood type [W] bugle head screws with ULP 302 (1 3/4") diameter washer or Lath Plate; 16 mm (5/8") minimum penetration into framing or 1" wire staples with minimum 3/4" crown and minimum 3/4" penetration into framing. | |
Notes: Supplemental fasteners, into the framing or sheathing, can be used to secure the PermaLath prior to application of cement plaster stucco. Fastening systems/tools for staples are available through Senco (www.senco.com) and other manufacturers. | | |
3. |
Apply cement plaster stucco within 60 days of PermaLath application.
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F. |
Exterior Cement Plaster Stucco
Install per Specifications and Details. Maximum plaster thickness is 1/2".
Note: Recommended method of stucco application is double back or scratch and brown. Use of tighter (less water) stucco mix in initial double back or scratch coat can ease stucco application. | |
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Applying |
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Apply flat and free of wrinkles vertically or horizontally. |
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Stapling |
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Pneumatic stapler eases application on wood based substrates (framing). |
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Overlapping |
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Overlap lath minimum 3" and over flange of trim accessories |
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BASFCC.Moss.Core.wsp 1.0.0.838 - S:37 T:11/21/2009 10:00:11 PM
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