Install metal lath and furring per ASTM C1063 (fastening, lapping, furring over sheathing)
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Select a lath type and weight rated for the framing spacing and exposure per C1063
Fasten lath at the spacing and penetration depth required for the substrate (wood, steel stud, or masonry)
Lap side and end joints per C1063 (side laps typically overlap at least one mesh opening; end laps require a minimum overlap) and stagger vertical joints
Furr lath away from the sheathing/WRB where furring is required so the lath is not in direct contact with the water-resistive barrier
Reinforce corners, openings, and terminations with the appropriate accessory before plastering
Known gotchas
Fastener spacing and penetration requirements differ by framing type (wood vs cold-formed steel); using one schedule for both is a frequent inspection failure
Confirm the current C1063 edition adopted by the local jurisdiction, since lap and fastening figures have been refined across revisions
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