Window Sill : Water Pooling Underneath .... is it normal ?

[rideforever]

Just had a new window sill fitted under a sash window, first rains have come now and the water appears to pool on the sill (does not run off) especially where the sash meets the sill. Is this a problem, the other sills don't seem to do it ??

 

[footprints]

Looks like it is getting under the window its self, it might be due to prevailing winds pushing it in. I assume the ledge slopes down the same as the others.

 

[rideforever]

Looks like it is getting under the window its self, it might be due to prevailing winds pushing it in. I assume the ledge slopes down the same as the others.

Yes it is facing the prevailing SW, hence it was the rotten one out of four in the lounge.

Though the water does not seem to be running off much, it just sits there, the new piece of wood has visible grain on it, like gentle scores in it, the older Victorian window sills were smooth and water drips off easily, and the older ones have a raised section directly under the sash, about 1", raised about 2mm.

I suppose the tilt angle of the sill is not a problem ? The top section, is only very slightly slopping down hence the spirit levels ?

What action can I take ? Should I sand it down smooth and then put gloss or slippery paint on ?

Water is able to get right to the top of the sill at the join. Not a problem today, but long-term ?

 

[footprints]

I would speak to the installer first, otherwise perhaps a strip of UPVC trim (Wickes do a good range) about 5mm thick and 30mm wide siliconed across for the window to sit on might work, giving you a slight upstand. Maybe even set it in at a slight angle on the silicone to help run off. There are two part seals for under doors to stop driven rain but I imagine they would be a bit "in your face" for a window.

 

[Notch7]

There appears to be no check rebate where the outer face of the bottom sash neets the cill. Usually there is a check rebate so water cant run back across the cill and under the bottom rail.

The slope makes hardly a difference, capillary action will help draw in the water and hold it in. The fresh paint might be making the water tension keeping it there.

If yoo want to stop it, groove the sash bottom and put in some draught seal.

https://www.google.co.uk/search?biw...E#imgdii=kdXrkQEadJ8OwM:&imgrc=xQYa0oein8fGsM: