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Why 2 cavity trays for one head / lintel?


WWilts

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That’s an MI detail for a specific stone / recon stone lintel that requires a slip plane. Means the outer stone isn’t structural in any way and takes all the loading off it. Only works if you can get a concrete (or box lintel) the correct size and dimensions to match the stone on the inside leaf. 
 

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1 hour ago, PeterW said:

Only works if you can get a concrete (or box lintel) the correct size and dimensions to match the stone on the inside leaf. 

Tks.

 

But why the lower cavity tray? Necessary?

Edited by WWilts
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