Stabilse and rebuild window sill

Sep 21, 2005 3 Replies

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nielsonj1976 20 years ago

I have been repairing some windows but have noticed that the underside of one of the stone window sills is very flaky and damaged.

Therefore I wish to stabilise this, rebuild it and finally paint it.

Any ideas on exactly how I should go about this? I thought about brushing away as much of the loose material first then painting with something to hopefully stabilse and stop most of the flakyness.

Would this be suitable? (Stabilising Solution Concentrate)

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would PVA do the job? Bearing in mind, this is an external job.

Once the surface is reasonably sound, I then thought I'd use either concrete mix or external filler to rebuild the shape.

Finally sand off and paint.

Any comments on this?

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jacob 20 years ago

If sandstone then definitely don't use any cement product as it reacts and causes stone deterioration; this may be the cause of your prob in the first place e.g. cement based pointing. Best left alone - any attempt to improve it will be short term and probably accelerate the deterioration. If its really bad then consider a new piece of stone.

cheers

Jacob

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Lobster 20 years ago

Use car body filler; works very well

David

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Stuart Noble 20 years ago

Certainly does, but you need to use a former of some kind. Clamp some 2" x 1" where you want the new edge to be. Smear it with vaseline as a release agent, and possibly put a few screws in the old sill to act as posts.

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