how to stop rain blowing in?

[jazzman34]

A couple of years ago i had to have a concrete lintel replaced.The builder put two steel girders above the window.There is a small gap between the top of the window and the girders.When the wind blows the rain heavily it leaks in very badly.We have to put towels on the window-sill as the water runs down the inside of the window.Any advice on the best way to stop this please!!!!

[welsh brickie]

on the outside of the window a plastic trim is required to cover the gap and siliconed in place.But it could be a crack in the masonry.Hose the wall and check.