What mortar mix to use here in 1930's inner wall

[qamar]

Hi Everyone,

 

We have stripped our bathroom of the old tiles and plaster underneath. We will be using plasterboard and installing new bathroom tiles on all the wall area.

Before i do that I would like to repoint where the mortar is missing. What mortar mix should i use?

 

As there is only a few places missing the mortor I was just thinking to use regular cement mortar but I imagine the old mortar would have been a lime mix.

Thanks in advance

 

[Redbeard]

Struggling to work out what bond that might ever have been. What does it look like on the outside? The reason I ask is that on the inside the RHS of the lintel seems to be sitting on a pile of bricks. I suspect that half of those I can see are through-bricks, which makes it less scary, but it still looks like it's not held together by much! In the light of this then any mortar is better than none at all, but you are right, the original is likely to have been lime. The lintel bearing would not meet today's standards but neither does that automatically mean it is 'going anywhere'.

Edited 18 hours ago by Redbeard

[joe90]

Any cracks on the outside?

[qamar]

Hi

Thanks for the reply

There are no cracks on the outside. The outside is pebbledash.

I believe that is all the original lintel and bricks.

So should i just use cement mortar or lime

Any suggestion for the mix to use?

 

I've attached a picture of the left side of the wall. This is a terraced house so that wall is also part of the neighbours

 

And this is the outside of the wall. Ignore the missing pebbledash just above the door. That was me just checking something.

 

 

 

Edited 17 hours ago by qamar

[Redbeard]

17 minutes ago, qamar said:

Any suggestion for the mix to use?

 

 

 

Possibly 3: 1 grit-sand and NHL 3.5 hydraulic lime may be easiest to get. If you have a lime supplier near you you could ask their advice. NB: *Hydrated* ('Bag-' lime) is not what you want. That is used mainly as an admixture in cement/sand/lime mixes.

[qamar]

11 minutes ago, Redbeard said:

 

 

Possibly 3: 1 grit-sand and NHL 3.5 hydraulic lime may be easiest to get. If you have a lime supplier near you you could ask their advice. NB: *Hydrated* ('Bag-' lime) is not what you want. That is used mainly as an admixture in cement/sand/lime mixes.

 

Thanks Redbeard

I was looking at this...

Womersleys Ironstone Old White Lime Mortar NHL 3.5 Based Pre Mixed 25kg Bag

Edited 17 hours ago by qamar

[Redbeard]

Looks good, particularly if you do not need much. Otherwise you buy 25kg NHL 3.5 and a fair old lot of sand (depends whether you are mixing by weight of volume, but crudely 25 kg, or 4 small bags from DIY stores. Fine if you need that much.

[qamar]

Thank you Redbeard You're a star!