Can water go through the Astra-Glaze-SW+ face?
No, the face of the Astra-Glaze-SW+ units is impervious to water. Tests have been conducted using high-pressure stream and no measurable penetration was recorded. All blocks used for glazing contain Trenwyth-approved water repellent additive to provide additional protection should water penetrate the wall through the mortar joints. Note: Any scores on the face of Astra-Glaze-SW+ blocks must be tuckpointed or water will, of course, penetrate through the scores.
