Steps

Recognize TMS 402/602 is a paywalled standard, sold by The Masonry Society (masonrysociety.org), ACI (concrete.org store), and ICC (shop.iccsafe.org) — there is no current free full-text edition.
Check whether your organization already has access via Masonry Standards Online (MSO) or a TMS membership (members receive a subscription discount) before purchasing separately.
Note that older editions (e.g., TMS 402-2016) are hosted in full on third-party code-reference sites like UpCodes (up.codes) at no cost — useful for historical/background reference, but confirm which edition your jurisdiction's building code actually adopts before relying on it.
For summary-level guidance without the full standard, BIA's free 'Overview of Building Code Requirements for Masonry Structures' PDF (gobrick.com) covers high-level provisions without reproducing the copyrighted specification text.
Budget for direct purchase of the current 2022 edition (TMS 402/602-22) if the project requires the code-adopted version and no subscription/membership access exists.

Known gotchas

Honest-negative: no legitimate free source for the current, code-adopted edition exists — free hosted copies found online are typically older editions and shouldn't be treated as equivalent to what's adopted in a live jurisdiction.
Verify which edition (2016, 2022, etc.) your local building code actually references before using any version, free or paid.

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Obtain the current TMS 402/602 (Building Code Requirements and Specification for Masonry Structures) for a project reference

Steps

Known gotchas

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