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How do you install glass blocks in an existing window?

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wikiHow Staff Editor

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You’ll need to remove the sash (the moving part of the frame that holds the glass panes), but you can probably leave the original frame. Take out any other pieces that might get in the way, like pulleys or inner jambs for the sash. You may need to put some shims in place to help the glass blocks fit correctly into the space. Don’t forget to tuck in some insulation around the edges before you put the blocks in place!

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What type of cement is used for glass blocks?

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You will need glass block mortar, which has a little bit more lime and sand than other types of mortar or concrete. The lower moisture content helps hold the glass blocks more securely and prevents running.

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Is glass block mortar waterproof?

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Yes. Glass block mortar contains lots of sand, lime, and some special chemical additives that are designed to let it dry to a sturdy, waterproof finish.

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What is glass mortar?

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Glass block mortar is a specially formulated product that is designed for glass block applications requiring white mortar joints. It can be used in both interior and exterior applications. Glass block mortar can also be used in laying brick, block, and tile where white mortar is desired. The formulation is a mixture of white cement, white sand, hydrated lime, and other waterproofing additives.

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What is the maximum size allowed for mortar joints on glass blocks?

Wes David

Community Answer

They are typically 1/4'' as the real size of the blocks is 1/4'' short of the actual measurements. (For example, an 8x8x3 block measures 7 3/4" to allow for the mortar joint.) If you are talking about head joints, I've seen them in excess of 2'', but that would mean the wrong size was built for the opening as glass block panels can be built to any size within 2''.

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