How to fix this window board to prevent cupping?

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aingram

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22 Feb 2025
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Hi there
I'm going to make a window board out of a piece of 40mm x 150mm x 1400mm flat sawn american white oak. I bought the wood from a builders merchant, the wood was in an outdoor open warehouse so a similar environment to where it is now. The window in an outdoor kitchen, it an open building but largely sheltered from rain. The underside of the board will get moist from the blockwork, the top will get dry from the sun coming through the window. Please help on what measures I should take to avoid cupping. My intention is to blackjack the blockwork where the board will sit. I'll also biscuit the board to the window frame. I intend to strap the board to the blockwork underneath with two of the pieces of metal shown. Will orientation the growth rings help? Growth rings like"u" or like "n".

thanks in advance, Andrew
20250301_131306.jpg
 
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