Caulk under window sill

63 Posts

Hi guys
The window sill on my bay window is a little drafty, see pic - theres a small little gap in the side and underneath the window sill.
How best should I fix this?
Caulk? If so what type of caulk do I use?
The window sill on my bay window is a little drafty, see pic - theres a small little gap in the side and underneath the window sill.
How best should I fix this?
Caulk? If so what type of caulk do I use?

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Replies
Filled so many drafts recently with the stuff.
Bear in mind, tho', that caulk is not sandable like normal filler, so would need smoothing off properly for a good finish straight off. It is water - based, tho', so can be smoothed well using a wet filling knife, finger or similar, or excess wiped off with a damp cloth. But any caulk you don't want will be awkward to remove after it's dried, and can't just be successfully sanded smooth, so get the finish you want when you apply it!
Tbh, for the areas you've shown, you should get good results blending it in with a wetted finger, following the profile of the cill-to-wall edge. Squish a good bit in, to at least an inch's depth. Smooth off with wet finger. Use damp cloth to remove any unwanted excess spread over surrounding areas. It 'skins' pretty quickly, so get the required finish/excess tidied up without too much delay.
The draught isn't necessarily coming from an outside gap in the frame, but could be from the wall cavity.