Glass block installation may use which mortar type?

Glass block installation may use which mortar type?

• A. type M
• B. type K
• C. type O
• D. type S

Answer: (D)

When setting glass blocks, you want a mortar that provides a strong, durable bond between the blocks while still allowing a little movement and resisting weather exposure. Type S mortar is designed for higher bond strength and good adhesion, which helps keep glass blocks securely in place and reduces the risk of joints cracking over time. It also handles moisture movement well, which is important for exterior installations. The other options are either too weak or too stiff for this application: mortar that’s too weak won’t hold the blocks reliably, and mortar with excessively high stiffness can place unnecessary stress on the glass blocks and joints. So, Type S is the best fit for glass block installations.

When setting glass blocks, you want a mortar that provides a strong, durable bond between the blocks while still allowing a little movement and resisting weather exposure. Type S mortar is designed for higher bond strength and good adhesion, which helps keep glass blocks securely in place and reduces the risk of joints cracking over time. It also handles moisture movement well, which is important for exterior installations. The other options are either too weak or too stiff for this application: mortar that’s too weak won’t hold the blocks reliably, and mortar with excessively high stiffness can place unnecessary stress on the glass blocks and joints. So, Type S is the best fit for glass block installations.