stuart noble wrote:
Jerry Built wrote...
I'm contemplating using Mighton plastic parting bead to
partially draughtproof some sash windows, and stop them
rattling. Has anyone used this? The problem I have is
that the bead is supplied in lengths of 2.4m and 3m,
neither of which work well with these windows - there
will be maybe 40% wastage, unless I can join lengths.
So: can lengths be joined, and how? Any other helpful
information will be very welcome.

Can't really see the benefit of plastic,

Have a look at Mighton's site. It's not a plain plastic strip
with a rounded nose like timber parting bead, it's more like
a broadarrow in section:

Jerry Built wrote in message ...
Have a look at Mighton's site. It's not a plain plastic strip
with a rounded nose like timber parting bead, it's more like
a broadarrow in section:
.
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This ^ bit goes in the groove, the "wings" press against the
inner and outer sashes.
Hm, but for how long? Any springy plastic I've used as draught excluders
flattens permanently when under pressure for long periods. Maybe it has a
silicone element?
And a bodge, too, by the sound. Maybe better to cut some more
wedges!
You could buy a thicker bead and rebate it to fit the slot. Difficult on
such a small section though.