On 09/04/2015 12:26, Chris Hogg wrote:
> Looks remarkably like the patio doors we used to have, even down to
> the appearance of the rotten ends of the sill, the peeling paint and
> its colour, and the lock. IIRC the weight of the doors is taken by the
> track across the bottom that the moving door runs on. I can't see you
> easily getting the sill out from under that track and replacing it
> without removing the doors. Again IIRC, the doors should more or less
> lift out, a feature much appreciated by burglars.
>
> I hated ours; they were for ever seizing up. As soon as one of the
> doors started to mist up, I got the whole shebang replaced, sill and
> all.
>
The sill itself doesn't look rotten and would probably hold a coat of
varnish better if treated with hood hardener. The lower part of the
frame itself looks a bit iffy, but might be repairable with 2 part
filler. I think the integrity of the frame would be affected by removing
the sill