www.ultimatehandyman.co.uk

I had some builders in who cut a window out for me, they have used a Concrete Lintel and put plasterboard and skimmed it over. I am now putting up a blind and looked at photos before the plasterboard went on that there is a huge void between the two lintels. Ideally, I don't want to take it down and start again so I am just wondering if there is something that I can squirt in (like they do when you have cavity wall insulation) that will fill this void and also take the strength to fix a blind upon it? Or any other suggestions would be greatly appreciated. Thank you in advance

Rickrick wrote: ↑Thu Feb 27, 2020 12:53 pm there is a huge void between the two lintels

What two lintels? You said a new window opening was made and a (one) lintel was fitted. Where is the void? If you have photos post them please.

This is the photo before the plasterboard and the skim having installed the window

What is that white stuff above the lintel? I hope it's not expanding foam. Have they installed a cavity tray?

Should be a catnic type lintel with cavity tray, packed tight with sand/cement/packers and not foam.
It needs coming out and doing properly