Cutting window board depth

4 Nov 2013
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United Kingdom
We have framed , insulated and plasterboarded the underneath of our bay. The previous window sill was about 3inch deep (not good)

I have bought some standard 219mm deep MDF window board, but this seems too deep even though I know it is a standard size. So I am going to take 1 and half inch off to reduce the overhang and make it look more appropriate.

I have got the use of a circular saw at the weekend to get it done.

Does anyone have any advice?
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219mm is a standard size if your reveal depth is about 180mm thus giving you an overhang of 39mm. If my reveal depth was about 75mm i would buy a 150mm MDF window board and rip that down, less waste less cost, unless of course you want a massive overhang.

When using a circular saw keep both hands on the saw and clamp the workpiece. Do not hold the workpiece with your free hand.

Good luck.
Thanks chirpy.

The reveal (which I assume is from the window frame to the front face of the plaster is 120mm and then I was going to have an overhang of about 50mm.

Which didn't look excessive to me. We are having a rad under it and i defo don't want a big overhang, and the reveal thickness is fixed.

Yes... Il be careful with that thing :)
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What do you guys think about the overhang distance. As the framing and plaster doesn't bring it up to the standard reveal. The window board depth needs reducing.

I originally wanted to reduce from 219mm to 175mm. This would still leave 60mm overhang. Is this excessive?

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