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What is the rough opening required when installing glass block with mortar?

April 26, 2017block glass mortar opening rough

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What is the rough opening required when installing glass block with mortar?

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Assuming the use of spacers or a inch wide mortar joint, multiply the number of glass blocks by the nominal size then add to that sum an extra inch. Apply this formula to determine both the width and heighth of the opening. A nominal size opening of 4 feet by 6 feet would require a rough opening size of 4 feet, inch by 6 feet, inch.