Steps

Confirm the org history: the Interlocking Concrete Pavement Institute (ICPI) and National Concrete Masonry Association (NCMA) unified effective July 1, 2022 as 'ICPI-NCMA,' then rebranded to the Concrete Masonry & Hardscapes Association (CMHA) after a member vote at the February 2023 annual meeting.
Use cmha.org (also published as masonryandhardscapes.org) as the current authoritative site — older bookmarks to standalone icpi.org or ncma.org content may redirect or be stale as of 2026.
Locate segmental retaining wall (SRW) design resources under CMHA's technical resources section, since SRW guidance was historically an ICPI specialty now folded into the unified association's technical library.
Check any downloaded SRW technical bulletin's publication date/logo to confirm it's post-unification CMHA-branded content rather than a legacy ICPI-only document.
If searching third-party sites (e.g., state masonry associations), verify they've updated their CMHA references, since some regional pages still used the interim 'ICPI-NCMA' name into 2023-2024.

Known gotchas

Rebrand chain to get right: ICPI + NCMA → interim 'ICPI-NCMA' (July 2022) → 'CMHA' (named February 2023) — search results may reflect any of these three stages depending on content age.
Don't assume all NCMA segmental-retaining-wall content moved to CMHA unchanged; confirm the specific bulletin/guide is still current on the CMHA site rather than citing an archived ICPI PDF.

Meet CMHA (formerly ICPI) aggregate base and compaction specifications when preparing a subgrade for interlocking or permeable paver installation

cmha.org · 6 steps · unrated

Determine when a retaining wall triggers a building permit and engineered design under the International Residential Code (IRC)

codes.iccsafe.org · 5 steps · unrated

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Find current CMHA technical resources for segmental retaining wall (SRW) design, given the 2022-2023 ICPI/NCMA unification

Steps

Known gotchas

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