Making window reveal smaller, studs or insulation?

[hotnuts21]

To be able to fit an egress window our supplier can only go upto 750 width, so I need to make the 900 aperture in our timber frame smaller.

 

The quickest way to do this is just put in 4 stud (140*40)  timbers 2 on either side of the opening.  But I was wondering would it be better to put in one stud 750 mm from one edge and create a little  void filled with insulation?

 

Obviously we will also put osb3 and membrane on the outside.

Edited October 31, 2021 by hotnuts21

[Mr Punter]

1 will work fine.  Maybe best on the right side so it lines up a bit more with the stud below.

[Iceverge]

Can you get an alternative window supplier?

[ProDave]

Yes different window supplier. No problem getting a 900 egress window.

[hotnuts21]

Cheers guys, yes we have been through quite a few quotes and this company has met all our requirements. I think one of the issues at the moment is they are all so busy, that customer service has gone out the window a bit, ive been into one local (well known) supplier 3 times and been told someone will ring you later today and not heard anything, its got to the point where I just want to order now and these guys can deliver.  Plus the window next to it 2m away is 1200 wide and 2400 high so there no issue making this one a bit smaller ?

 

The manufacturer has said the issue is with the opener, its only rated to 750, and they have had issues going bigger in the past, although the frame manufacturer says they can goto 800, which is a bit odd, but its not the end of the world, I just want the windows on site now ? The windows are aluminium, using the flush Altitherm 800 profile and double glazed. Ive got another thread on this forum about installing them (had no response to that so I presume im on track.), if anyone knows of any well priced aluminium flush windows who its worth getting a quote from, drop me a DM.

I will go with the 1 stud as suggested. Will be ordering this week.