Bought a standard softwood casement (from Jeld-Wen cat. I think) but messed up by assuming sill size was amount of sill projecting from frame when it meant front-to-back measurement. Now need to replace the 'stub' sill with a full depth one. Should I dismantle, plant a new piece of timber on or, with moderate skills only with plane etc. take it to a joinery to get it sorted? Thanks for any polite advice. Peter
Cill profiles should be available from your local timber merchant (but probably not a shed)
Malcolm
The sill doesn't need to be a very sophisticated piece of joinery, but it does need to be jointed so that there isn't a ready path for moisture to penetrate.
I would be thinking about slicing off the old sill from the rest of the bottom rail of the window frame - by slightly (say 10mm) undercutting it relative to the rest of the frame - but otherwise not disturbing the bottom rail of the frame. Either saw it off near flat with a circular saw, then create a rebate with a router - or possibly do the whole job with the router. Beware of buried metal fixings.
However *first* make up your new sill. You may be lucky a find a timber merchant that can supply a suitable donor-profile to work from
- otherwise making it up from scratch isn't too bad. Think about rain run-off paths, rounded edges and a drip-groove on the underside.
Join the new piece with both glue (polyurethane or epoxy) and fixings (capped-over screws, biscuits, dowels) - and cramp up the joint really well.
Don't know what you have int the way of power tools (and straight guides for them) - this *could* be done handtools only - but you'd have to be confident in planing up a very straight flat edge over the whole length where you're gluing the new sill onto the base of the window.
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