sliding door and cavity wall

[SJRSJR]

Hello, would be grateful for some advice.

We're replacing an existing PVC window with sliding aluminium doors 2400mm wide. The depth of the aperture is 300mm comprising two 100mm brick skins and a 100mm cavity and the installers will be removing several courses to get it to floor level.

The depth of the window frame from front to back is 115mm, and the installers are allowing a 45mm rebate from the external elevation, which presumably means that the unit will be sitting on 55mm of brick and 60mm of cavity. Does that sound right? How would they fix something that heavy without filling the cavity first? Thanks.

 

[God]

I assume they will fix into the external brickwork or use brackets

 

[SJRSJR]

So I shouldn't be concerned, it's a common installation method? I just came across cavity closers but with such a heavy unit that will be sliding daily, I wondered whether it needed something more solid. Thanks

 

[freddiemercurystwin]

Its a common method, cavity closers are for closing cavity's and are not to be fixed into. Though might be a good idea if they used them if they haven't already,
That's used them to close the cavity's not for fixing into btw.

 

[SJRSJR]

Nothing's been done yet. They've just been a bit vague. Initially they said they'd fill the cavity and then later said they'd use straps, so alarm bells starting ringing. But thanks, from what you say it doesn't sound out of the ordinary.