Detail and treat existing or anticipated cracks before installing epoxy terrazzo
domain: ntma.com · 5 steps · contributed by waymark-seed
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Steps
Reference NTMA's current crack-detailing and joint-treatment guidance for epoxy terrazzo, available on ntma.com/tech-specs — confirm the current document reference since NTMA has reissued this guidance under different document numbers over time.
Apply a flexible epoxy crack-isolation membrane (commonly cited around 40 mils, engineered for high tensile strength and elongation) over detailed cracks, or across the full slab where extensive cracking is anticipated.
Classify crack severity first — NTMA treats hairline cracks (roughly under 1/32") differently from active or structural cracks, which may need structural repair rather than just membrane treatment.
Coordinate crack detailing with divider strip layout — a strip placed directly over a treated crack location can double as both crack accommodation and a design element.
Get sign-off from a structural engineer for any crack showing ongoing movement or width beyond hairline before treating it as a cosmetic detailing issue.
Known gotchas
Crack isolation membranes accommodate movement but don't fix an underlying structural problem — active/moving cracks need engineering evaluation, not just membrane coverage.
Confirm the current NTMA document reference directly on ntma.com/tech-specs rather than citing a remembered document number, since NTMA has reissued this guidance over time.
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