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Filling in blocks around windows


gravelld

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We replaced our windows and had a Compriband style product applied around them. Unfortunately the windows were very tight, and some block work fell out as the old apertures were prepared.

 

The result is a couple of these:

IMG_20190913_084926.thumb.jpg.98f4396cd794445e17e1794fd5a7dcaa.jpg

 

And a few smaller ones too:
IMG_20190913_084837.thumb.jpg.6d6f4f092a1d38bd2af0cf6aa8d8307c.jpg

 

So the problems are that:

- The expanding foam tape isn't covering the gap

- There's not a solid base for re-rendering to occur

 

I have some aircrete (Toplite) and some dense concrete block and also plenty of mortar.

 

Shall I try cutting the aircrete to size and wedging it in?

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25 minutes ago, gravelld said:

We replaced our windows and had a Compriband style product applied around them. Unfortunately the windows were very tight, and some block work fell out as the old apertures were prepared.

 

The result is a couple of these:

IMG_20190913_084926.thumb.jpg.98f4396cd794445e17e1794fd5a7dcaa.jpg

 

And a few smaller ones too:
IMG_20190913_084837.thumb.jpg.6d6f4f092a1d38bd2af0cf6aa8d8307c.jpg

 

So the problems are that:

- The expanding foam tape isn't covering the gap

- There's not a solid base for re-rendering to occur

 

I have some aircrete (Toplite) and some dense concrete block and also plenty of mortar.

 

Shall I try cutting the aircrete to size and wedging it in?

A slightly different approach I used for the similar issue. I made some angle pieces in timber just slightly short of the height of the defect, clamped/jammed etc. them onto the corner and made up a concrete mix - I used some "Ciment Fondu" in the mix to speed up the setting time and trowelled it down the gap at the top occasionally tapping the form with a hammer to remove voids. At the top my mix was of a low slump that I could just trowel it into the gap and flattened it. I took the forms off before it went super hard and scratched it so the render had something to adhere to. 

 

I was really pleased with the repairs, looked smart and must have taken me about 15 minutes all in! 

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