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Old 09-01-2011, 11:00 AM   #1
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cement board

i have a brick chimney chase 30x56 with bricks single laid so the chase is basically hollow, can i use 1/2 cement board as a cap and cover it with 1 to 1-1/2" cement. My prefab fireplace flue runs thru this chase

Last edited by fred j mann; 09-01-2011 at 11:02 AM.
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Old 09-01-2011, 11:30 AM   #2
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cement board

Cement board will sag trying to bridge those dimensions.

Cement board is not waterproof.
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