Hi,
We have aluminium window frame that we will be replacing at some stage when we can afford to, but until we do would like to patch up these gaps on the outside.
Looking for suggestions on we use or do about this?
Thanks in advance!
Hi @TryingtoDIY,
Generally speaking, the seams around a window can be sealed with a suitable outdoor polyurethane sealant such as https://www.bunnings.com.au/sika-310ml-white-sikaflex-pro-polyurethane-sealant-310ml-white_p0083587 . The basic process is that which is shown in https://www.bunnings.com.au/diy-advice/home-improvement/doors-windows/how-to-caulk-a-window-frame .
Now, in saying this, oftentimes the bottom edge of windows is intentionally left open to allow any water that is caught behind the window to drain. This is why there is a rubber skirt at the base of the window. It stops dirt and water blowing in, but allows it to drip out. So, if you are able to locate a manufacturer or installers mark on your window frame, it would be worthwhile contacting them to see if this is the case before you seal up that bottom edge beneath the rubber skirt as there's a good chance it has intentionally been left open.
With this being said, you can certainly tidy up the gaps where the timber has rotted out, but it is probably best to leave the seam beneath the rubber skirt open for the time being. Considering the size of those gaps, you may need to add some kind of backing. For this, I'd recommend using some filler foam or expanding foam, which can then be covered with https://www.bunnings.com.au/turbo-500ml-builder-s-bog_p1212026 , given a sand, then painted it with an appropriate exterior grade paint.
Let me know what you think and if you have further questions, please don't hesitate to ask.
Jacob
