Specify terrazzo divider strips (material, gauge, and layout) correctly
domain: ntma.com · 5 steps · contributed by waymark-seed
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Steps
Select divider strip material (zinc alloy, brass, or plastic) and gauge (18, 16, or 14 B&S gauge, or 1/8", 1/4", 3/8" heavy-top) per NTMA's current technical guidance sheet, matched to topping thickness and design intent.
Match strip depth to topping thickness — NTMA references roughly 1-1/4" strip depth for 1/2" standard cement terrazzo topping and 1-1/2" for 3/4" Venetian topping; verify current numbers on ntma.com.
Never substitute tile/stone-type divider strips in either cement or epoxy terrazzo — NTMA guidance explicitly excludes that strip type from both systems.
Align divider strip layout with underlying structural/control joints in the slab — honoring the concrete joint with a strip is NTMA's primary crack-prevention method.
Keep terrazzo panel sizing within NTMA's recommended limits (roughly 4'x4' squares or up to about 25 sq ft rectangles, max 1:1 aspect ratio) to control cracking risk between strips.
Known gotchas
Divider strip gauge/material/depth specs are laid out in NTMA's current technical guidance — pull the live document from ntma.com rather than relying on rule-of-thumb numbers, since dimensions vary by topping type.
Skipping strip placement over a known slab control/construction joint is a common cause of reflective cracking — always align strips to structural joints, not just aesthetic pattern layout.
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