How to repair window flashing?

[kathryn11]

Hello,

I am looking for advice on how to repair or replace the plastic type material that sits at the base of an outside window and the bricks (flashing?). The material has disintegrated over the years and there is one gap where the brick dooesnt meet the window or missing cement in bricks so silicone isnt an option. Hoping there is some way to make this area weather proof. Perhaps an aluminium strip of some sort? Or if you could point me to the right trade for this please.

The 2 windows are about 2.4m and 2.8m wide.

Thanks

 

 

 

[EricL]

Hello @kathryn11 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your window flashing. 

For a quick repair, I suggest using Earl's 500g Concremate Expanding Cement. I suggest mixing it as thick as toothpaste and patching the gap in the bricks. You can also use it to patch any other gaps or cracks that's along the length of the window. Once the concrete cures, you can either cover the surface with a silicone sealer such as Selleys 290ml Clear Storm Waterproof Gutter And Roof Sealant - Clear or use Grunt 50mm x 10m Flashing Tape (please note that this has a silver aluminium finish on its surface).

If you wish to use a trades person, you'll need to search online for a window specialist that does window flashing repair. I also suggest looking at Airtasker or Hipages to get a quote. 

Let me call on our experienced members @Dave-1 and @Nailbag for their recommendations.  

If you need further assistance, please let us know.

Eric

[Nailbag]

Hi @kathryn11 

that rubber weather strip is part of the lower frame if the window. Unfortunately it’s not replaceable as it slides in from under the frame sill

The easiest and most effective way to weather seal any gaps is to use a silicone sealant. I recently had to apply this on a home with a similar issue as well as side gaps odour to brick mortar breaking away over the years. 

Nailbags

[Dave-1]

Good Morning @kathryn11 

I was thinking of faking it and also using either @EricL 's or @Nailbag 's suggestion

So fill the gap with the either Eric's or Nailbag' solution. 

Then use something like Moroday 40 x 3mm x 5m Small Adhesive Seal Roll on the underside of the existing strip. I would check the roll to make sure it fits width wise and isnt spongy (I was looking for a solid flexible rubber strip) Securing it along the underside a fair distance will also help stop the existing weather strip from potentially tearing as well.

Dave

[kathryn11]

Thanks @Nailbag . Would you advise to trim back the brittle flashing to the window line and then apply the silicone?

[JacobZ]

Hi @kathryn11,

I am sure @Nailbag will respond shortly, but in the meantime, I would say that approach would be fine.

You could use a utility knife to cut back the rubber and then apply a bead of Black Sikaflex 11FC Purform to seal up the gap.

Please remember to wear gloves and long protective clothing when working with knives, as there is always potential for lacerations.

Let me know if there is anything else I can assist with.

Jacob

[Nailbag]

Hi @kathryn11 

I had a similar job for a client some weeks back and as with that job I would leave the flashing in place as its doing more good than harm. I then used a flat blade like a spatula to lift the flashing slightly and apply the silicone just under. Where it doesn't lift, missing or cracked, then silicone over those spots.

Nailbag