SECTION 09206

METAL FURRING AND LATHING

PART 1 GENERAL

SECTION INCLUDES

[Wall,] [bulkhead,] [ceiling,] [and] [furred space] framing.

Metal lathing for wet plaster finish.

[Access panels.]

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

[Section 08305 - Access Doors: Metal access panels integral with furring and lathing.]

Section [______-____________]: [Mechanical] [Electrical] components built into work of this section.

RELATED SECTIONS

Section 05400 - Cold Formed Metal Framing.

Section 08111 - Standard Steel Frames: Installation of door frames.

Section 08114 - Custom Steel Frames: Installation of door frames.

[Section 08305 - Access Doors:	Access panels.]

Section 09111 - Metal Stud Framing System.

Section 09210 - Gypsum Plaster.

Section 09220 - Portland Cement Plaster.

Section 09260 - Gypsum Board Systems.

REFERENCES

ASTM C841 - Installation of Interior Lathing and Furring.

ASTM C847 - Metal Lath.

ASTM C933 - Welded Wire Lath.

ASTM C1063 - Installation of Lathing and Furring for Portland Cement Plaster.

GA-600 - Fire Resistance Design Manual.

ML/SFA (Metal Lath/Steel Framing Association) -Specifications for Metal Lathing and Furring.

SYSTEM DESCRIPTION

Fabricate vertical wall and furred space framing to limit finish surface deflection to [1/180] [____] under lateral point load of [100] [____] lbs ([445] [____] N).

Fabricate horizontal ceiling and soffit framing to limit finish surface to [1/240] [1/360] [____] deflection under superimposed dead loads [and wind uplift].

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Product Data: Provide data on furring and lathing components, structural characteristics, material limitations and finish.

Samples:	Submit [two] [_______] samples, [____x____] inch ([____x____] mm) in size illustrating component design, material, and finish.

QUALITY ASSURANCE

Perform Work in accordance with [ASTM C841,] [GA-600,] [ML/SFA,] [ASTM C1063] [and] [________].

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Applicator: Company specializing in performing the work of this section [with minimum [__________] years [documented] experience] [approved by manufacturer].

REGULATORY REQUIREMENTS

Conform to [applicable] [________] code for fire rated assemblies in conjunction with Section [09210] [________] as follows:

Fire Rated Partitions: Listed assembly by [UL] [FM] No. [________].

Fire Rated [Ceiling] [and] [Soffits]: Listed assembly by [UL] [FM] No. [________].

Fire Rated Structural Column Framing: Listed assembly by [UL] [FM] No. [________].

Fire Rated Structural Beam Framing: Listed assembly by [UL] [FM] No. [________].

MOCKUP

Provide mockup under provisions of Section [01400.] [________.]

Construct mockup, [____] feet ([____] m) long by [____] feet ([____] m) wide, which includes furring, lathing, subsequent plaster finishes, substrate, incidental flashings, sealants, and other components. Coordinate with installation of associated work of Sections [05400,] [09111,] [09260,] [and] [________].

Locate [where directed.] [________.]

Mockup may [not] remain as part of the Work.

PART 2 PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600.] [________.]

FRAMING MATERIALS

Furring Channels: Formed steel; minimum [25] [____] gage ([0.5] [____] mm) thick, [3/8] [____] inch ([10] [____] mm) deep x [3/4] [____] inch ([19] [____] mm) high; length as required.

Main Ceiling Channels: Formed steel; minimum [18] [_____] gage ([1.2] [____] mm) thick, [3/4] [____] inch ([19] [____] mm) deep x [1-1/2] [____] inch ([38] [____] mm) high; length as required.

Resilient Channels: Formed steel; minimum [25] [____] gage ([0.5] [____] mm) thick; size and length as required, [serrated] [________] face, [flattened 'Z'] [hat shaped] [________] profile.

Hangers:	[Galvanized steel] [Unfinished steel] [Monel] [Aluminum], of size and type to suit application, to rigidly support ceiling components in place, to deflection limits as indicated.

Lateral Bracing:	Formed steel; minimum [16] [____] gage ([1.5] [____] mm) thick; size and length as required.

Casing Bead:	Formed [sheet steel] [zinc] [PVC]; minimum [26] [____] gage ([0.5] [____] mm) thick; depth governed by plaster thickness; maximum possible lengths; [expanded metal] [solid] flanges, with [square] [bullnosed] [bevelled] [________] edges.

Corner Bead:	Formed [sheet steel] [zinc] [PVC]; minimum [26] [____] gage ([0.5] [____] mm) thick; depth governed by plaster thickness; maximum possible lengths; [expanded metal] [solid] flanges, with [radiused] [bullnosed] [________] edge.

Base Screed:	Formed [sheet steel] [zinc] [PVC]; minimum [26] [____] gage ([0.5] [____] mm) thick; depth governed by plaster thickness; maximum possible lengths; [expanded metal] [solid] flanges, with [bevelled] [________] edge.

Control [and Expansion] Joint Accessories: Formed [sheet steel] [zinc] [PVC]; minimum [26] [____] gage ([0.5] [____] mm) thick; [accordion] [________] profile, [2] [____] inch ([50] [____] mm) [expanded metal] [solid] flanges each side; [________] manufactured by [____________].

LATHING MATERIALS

Metal Lath: [ASTM C847;] [flat diamond [self furring] mesh] [flat rib, 3/8 inch (10 mm) high] [rod ribbed, 3/4 inch (19 mm) high] [stamped sheet]; [[3.4] [2.5] [1.75] lb/sq ft ([15] [11] [8] Kg/sq m)] [of weight to suit application]; [backed with [treated] [foil] [________] paper].

Welded Wire Lath: [ASTM C933;] [____] gage [____] inch ([____] mm); [paper strips woven into lath,] of weight to suit application.

Corner Mesh:	Formed sheet steel; minimum [26] [____] gage ([0.5] [____] mm) thick; [perforated] [expanded] flanges shaped to permit complete embedding in plaster; minimum [2] [____] inch ([50] [____] mm) size.

Strip Mesh: Expanded metal lath, minimum [26] [____] gage ([0.5] [____] mm) thick; [2] [____] inch ([50] [____] mm) wide x [24] [____] inch ([600] [____] mm) long.

ACCESSORIES

Access Panels, Non-Fire Rated In Plaster on Metal Furring: Formed [stainless] steel; Model [________] manufactured by [________________].

Access Panels, Fire Rated In Plaster on Metal Furring: Formed [stainless] steel, [[____] hour] [[____] label] fire rating; Model [________] manufactured by [________________].

Anchorage: Tie wire, nails, screws and other metal supports, of type and size to suit application; to rigidly secure materials in place.

Polyethylene Sheet: Clear, 6 mil (0.15 mm) thick.

Tie Wire: Annealed [galvanized] steel.

FINISHES

Framing Materials: [Galvanized.] [Rust inhibitive primer.]

Hangers, Anchors, and Fastening Devices:	[Galvanized.] [__________.]

Lath Materials: [Galvanized.] [Rust inhibitive primer.]

Access Panels: [Primed steel.] [Galvanized steel.] [Stainless steel with [brushed] [________] finish.] [Unfinished.] [Specified in Section [08305] [________].]

PART 3 EXECUTION

EXAMINATION

Verify site conditions under provisions of Section [01039.] [________.]

Verify that surfaces conditions are ready to receive work.

WALL AND FURRED SPACE FRAMING

[Install lathing and furring for Portland cement plaster work in accordance with ASTM C1063.]

[Erect wall furring by directly attaching to [masonry] [concrete] [________] walls.]

Erect furring channels at [horizontally] [vertically]; secure with fasteners on alternate channel flanges at maximum [24] [____] inches ([600] [____] mm) oc.

Spacing furring channels maximum [16] [24] [____] inches ([400] [600] [____] mm) on center, not more than [4] [____] inches ([100] [____] mm) from [floor and ceiling lines.] [abutting walls.] [________.]

Space resilient channels at maximum [24] [____] inches ([600] [____] mm) on center. Place joints over framing

members.

CEILING AND SOFFIT FRAMING

Install furring to height indicated.	Erect after above ceiling or soffit work is complete. Coordinate the location of hangers with other work.

Install furring independent of walls, columns, and above ceiling work.

Securely anchor hangers to structural members or embed in structural slab. Space hangers to achieve deflection limits indicated.

Space main carrying channels at maximum [72] [____] inch ([1 800] [____] mm) centers; not more than [6] [____] inches ([150] [____] mm) from wall surfaces. Lap splice securely.

Securely fix carrying channels to hangers to prevent turning or twisting and to transmit full load to hangers.

Place furring channels perpendicular to carrying channels, not more than [2] [____] inches ([50] [____] mm) from perimeter walls, and rigidly secure. Lap splice securely.

Reinforce openings in suspension system which interrupt main carrying channels or furring channels with lateral channel bracing. Extend bracing minimum [24] [____] inches ([600] [____] mm) past each opening.

Laterally brace suspension system.

[Erect resilient channels at maximum [____] inches ([____] mm) on center. Rigidly secure in place.]

CONTROL [AND EXPANSION] JOINTS

Position and install control [and expansion] joints.

****** [OR] ******

Install control [and expansion] joints with [back to back] casing beads [set [1/4] [____] inch ([6] [____] mm) apart]. Set both beads over [6] [____] inch ([150] [____] mm) wide strip of polyethylene sheet to assist with air seal continuity.

Coordinate joint position and location with Section [09210,] [09220,] [09260,] [and] [________].

****** [OR] ******

Control Joint Spacing: [____] feet ([____] m) oc [and as indicated on reflected [ceiling] [soffit] plan.

Expansion Joint Spacing:	[____] feet ([____] m) oc [and as indicated on reflected [ceiling] [soffit] plan.

ACCESS PANELS

Coordinate work with installation of metal access panels. Refer to Section 08305.

****** [OR] ******

Install metal access panels and rigidly secure in place.

Install frames plumb and level in opening. Secure rigidly in place.

Position to provide convenient access to concealed work requiring access.

LATHING

Apply metal lath taut, with long dimension perpendicular to supports.

Lap ends minimum [1] [____] inch ([25] [____] mm). Secure end laps with tie wire where they occur between supports.

[Lap sides of diamond mesh lath minimum [1-1/2] [____] inches ([38] [____] mm).] [Nest outside ribs of rib lath together.]

Attach metal lath to wood supports using nails at maximum [____] inches ([____] mm) on center.

****** [OR] ******

Attach metal lath to metal supports using [tie wire] [________] at maximum [6] [____] inches ([150] [____] mm) on center.

****** [OR] ******

Attach metal lath to [concrete] [and] [concrete masonry] using wire [hair pins,] [hooks,] [or] [loops]. Ensure that anchors are securely attached to backup surface and spaced at maximum [24] [____] inches ([600] [____] mm) on center.

Continuously reinforce internal angles with corner mesh, except where the metal lath returns 3 inches (75 mm) from corner to form the angle reinforcement; fasten at perimeter edges only.

Place corner bead at external wall corners; fasten at outer edges of lath only.

Place base screeds at termination of plaster areas; secure rigidly in place.

Place [4] [____] inch ([100] [____] mm) wide strips of metal lath centered over junctions of dissimilar backing materials. Secure rigidly in place.

Place lath vertically above each top corner and each side of door [and glazed] frames to [6] [____] inches ([150] [____] mm) above ceiling line.]

Place casing beads at terminations of plaster finish. Butt and align ends. Secure rigidly in place.

Place strip mesh diagonally at corners of lathed openings. Secure rigidly in place.

TOLERANCES

Maximum Variation from True Lines and Levels: [1/8 inch in 10 feet] [____] ([3 mm in 3 m] [____]).

Maximum Variation from True Position: [1/8] [_____] inch ([3] [_____] mm).

END OF SECTION