How to fill gap under window-sill?
 

A builder put in a new window-sill in our kitchen
a year or so ago, and I just noticed that
there is a large gap - up to 1 inch at one end -
underneath the sill, and there is a strong draught
through this space on windy days.

I'm wondering what is the best way to fill this gap?

I should say in explanation that the sill was put in
when our sash-windows were restored.
We didn't actually ask for the sill to be put in;
I presume the builder did it because he thought
the existing setup did not do justice to his window.

Also the space is probably there to level the sill.

How to fill gap under window-sill?
 

Timothy Murphy wrote:

A builder put in a new window-sill in our kitchen
a year or so ago, and I just noticed that
there is a large gap - up to 1 inch at one end -
underneath the sill, and there is a strong draught
through this space on windy days.

I'm wondering what is the best way to fill this gap?

A mortar mix would be best. £5 or so for the materials. You'll need only
a couple of kilos or so of cement, but will have to buy a 25kg bag, so
maybe go to one of the DIY stores to get a small bag if you are unlikely
to use the rest.
Another way would be expanding foam, with a finish of silicone sealant
on the outside.Again, £6 - 8 in materials.Can be a bit messy.

Alan.
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How to fill gap under window-sill?
 

Timothy Murphy wrote:

A builder put in a new window-sill in our kitchen
a year or so ago, and I just noticed that
there is a large gap - up to 1 inch at one end -
underneath the sill, and there is a strong draught
through this space on windy days.

I'm wondering what is the best way to fill this gap?

I should say in explanation that the sill was put in
when our sash-windows were restored.
We didn't actually ask for the sill to be put in;
I presume the builder did it because he thought
the existing setup did not do justice to his window.

Also the space is probably there to level the sill.

1:6 mortar would be good. If you dont have any use for 25kg you
can get dinky little bags of premix which would be fine for this job.


NT