A load-bearing glazing accessory placed beneath or at specified locations around a lite to support, position, and distribute glass weight or system loads.
GlassRenu · Educational illustration
Meaning and boundaries
It is not an incidental shim; material, hardness, size, compatibility, and placement are system-specific.
Why it matters in glass restoration
Missing, damaged, displaced, or incompatible blocks can load edges, obstruct drainage, affect seals, or make tool loading unsafe.
Related terms
References
- National Glass Association — GANA Glazing Manual, 2022 edition
Publisher’s original source - ASTM International — C864 — Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers
Publisher’s original source - National Glass Association and FGIA — Compatibility Testing of IG PIB Primary Sealant with Respect to Glazing Materials
Publisher’s original source