1930s Semi - Large Gaps In Brickwork

[MrMiller]

Hi folks

Still working on our upstairs bathroom and having removed the old tiles and plasterboard above where the toilet was, I've got some pretty big gaps:-

Also got an issue where I'll have a gap where that 2x6 beam which you can see on the bottom right below the window is. I had hoped to leave it in place but my plan is to attach insulated backer boards to the bricks and it doesn't sit flush, so I'll have to remove it I think.

Someone had mentioned just using easifill or suchlike but I'm not sure - I was considering just using standard mortar but not sure if I need limestone mix?

Here's a picture of the back wall where I have the issue of filling the old backer board holes:-

Same issue here - Was just going to use some tube repair mortar to fill but will I be okay with that or could it cause problems down the line and I really need lime mortar? I just want these to be filled and hard incase I land up drilling right beside these gaps when attaching the new boards.

 

[Wayners]

Cavity walls?
Just buy a ready mixed lime mortar or make your own up

 

[MrMiller]

Cavity walls?
Just buy a ready mixed lime mortar or make your own up

I'd rather buy ready mixed if I can because otherwise I'm going to land up with a huge bag with very little usage I think. But then, I'm struggling to see this as a read mix option...

 

[Wayners]

You will be surprised how much you will use.
Probably better to make your own up I think.
£20 ish for lime and buy sand as required.
Bin the remaining lime when done.

 

[MrMiller]

You will be surprised how much you will use.
Probably better to make your own up I think.
£20 ish for lime and buy sand as required.
Bin the remaining lime when done.

Thanks - Got a spare bag of builders sand from a garden operation earlier in the year, so I might land up doing that...

What's the consensus for the right mix ratio? I think I read 1:1:5 somewhere but not sure if less / more if I want this to be reasonably firm in filling those holes in the bricks rather than the gaps around them.

 

[Wayners]

Watch YouTube as you will find demos of mixing lime mortar

 

[avonmouth]

You will be surprised how much you will use.
Probably better to make your own up I think.
£20 ish for lime and buy sand as required.
Bin the remaining lime when done.

£20............Double that at least

 

[Wayners]

@avonmouth

£20 from B&Q. Am I looking at the wrong stuff?