Cavity tray types? Retro-fit?

GaryinAshby · 13 Feb 2008

I'm familiar with the type of try below, which is built into the brickwork as work progresses. These can also be fitted into existing brickwork by chopping bricks out, inserting the tray & re-bricking.

However, is there anything else available that doesn't require bricks to be chopped out? Maybe something where you chop out a line of mortar & insert it in through there? I need to insert cavity trays in the existing house wall that my extension is joined to & just wondered if there was anything available that was easier to use?

Thanks

^woody^ · 13 Feb 2008

No

You either use a wide roll of DPC or preformed trays - either way you will have to chop bricks out

GaryinAshby · 13 Feb 2008

Thanks. Wide DPC roll? Sounds easier, just take out a row of bricks & insert DPC so that the far edge is curled up the inside of the inner wall, then insert the lead flashing under the DPC as per the sketch below?

^woody^ · 13 Feb 2008

No it's not that simple. In your diagram, the felt will just flop down the cavity.

You should have a min 150mm upstand to the inner skin and this needs to be chased in or otherwise securely fixed.

mfarrow · 13 Jul 2015

^woody^ said:
You should have a min 150mm upstand to the inner skin and this needs to be chased in or otherwise securely fixed.

Is a line of silicone OK? (yes, I know how old the thread is)

^woody^ · 13 Jul 2015

No, not if that's the only method of holding the tray to the wall.

Nige F · 14 Jul 2015

GaryinAshby said:
Thanks. Wide DPC roll? Sounds easier, How can it be easier? how many bricks are you going to remove at a time to create a space to work in

mfarrow · 14 Jul 2015

^woody^ said:
No, not if that's the only method of holding the tray to the wall.

OK what do you suggest? Screws and washers?

noseall · 15 Jul 2015

mfarrow said:
^woody^ said:

No, not if that's the only method of holding the tray to the wall.

Click to expand...

OK what do you suggest? Screws and washers?

Galv clout nails if the inner leaf masonry is block.

jeds · 16 Jul 2015

Look up type x remedial cavitrays at cavitytraysyeovil. We use these and they are relatively easy to fit.

www.cavitytrays.co.uk

Nige F · 16 Jul 2015

But they cost more than a roll of DPC and a handful of clout nails

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Cavity tray types? Retro-fit?

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