wrote:

Now I know this is a stupid question but I'm trying to get my head
around measuring up for windows for a timber frame opening.

When you're looking at the opening from the exterior does the top of
the cill (reconstituted stone) sit level with the bottom of the timber
frame window opening or is it the bottom of the cill that sits level
with it.

IME, the frame sits on the cill (or at least level with its top surface)...


--
Cheers,

John.

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