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Replacement cavity tray width


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I am looking to replace cavity trays on my house where it's suspected that the tray (bitumen I think) has failed.

 

I am looking to use 450mm type E trays, which, you only need to take 3 bricks out at a time to fit.

 

The question I have house far over the window do they need to go. E.g a 900mm window, does the length of cavity tray need to be min 100mm longer either side (1100mm total)

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I did them on one of our rentals and hired a brick saw for the day from Smiths rather than using an angle grinder Cuts through like butter 

Less mess and much quicker and neater 

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