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Interest to know the gap (distance) that's wanting to be filled. Outside of what I know but when the stone work becomes degraded it's repairable to come up like new - could whatever the bricky would use be used close the gap from the stone to then be sealed and paintable from the window
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Pack the variable dimension joints with cylindrical foam backer rod*, (a simple twist reduces the backer rod's diameter), followed by your Mapei sealant of choice.
(* I may be able to offer you some).
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If the stone work is painted forget about it and use CT1
bluehuw
mespilus
@NotThamesWater
Stone mullions, sash windows and sealant.
My "akshewerly, the traditional method of burnt sand mastic is the most appropriate contemporaneous method for this sort of thing" just doesn't work.
And I probably didn't wrong anyway.
The thermal expansion and contraction of the last few years has, quite frankly, made a mockery of my efforts.
What has everyone else done with their leaky Victorian bay windows and frames?
The wood needs a bit of TLC, but I'm tempted to just use a modern, flexible, above all waterproof caulk, in all the gaps and joints.
Inb4 soudal it all.