ᐅ Retrofitting Seal Between Aluminum Window Sill and Window Frame from the Outside

Hello,

unfortunately, we are missing the so-called screw flange gasket between the window sill screw flange and the window frame profile to ensure a rain-tight installation of the window sill. This is how the edge looks in our case (without gasket and without compressible sealing tape behind it):

Now, I have noticed on a building (around 5 years old) something on the windows that appears to be a retrofitted or externally applied seal at the window sill screw flange to the window frame profile:

This could be a solution to our problem. However, I have not been able to find anything suitable through online searching.

Can you help me? Thank you!

Anything added afterward, which cannot seal as effectively as the original sealant, also won’t really help in your case, based on your picture. For example, I would use Ottoseal M360.

The part I photographed looks more stable than a sprayable joint. I would really like to know how this part is called or how to find it.

Bauherr am L schrieb:

The part I photographed looks more solid than a sprayable joint. I would really like to know what this part is called or how to find it.

Maybe @11ant, as an experienced window specialist, can help. I would have more confidence in Ottoseal.