Pour in mortar mix?

[FiveKnuckleShuffle]

Hi all,
After some advice please.

Slowly doing up a stone terraced cottage and I’ve pulled out a window sill as of a noticeable draught from where it meets the wall.

This has revealed all inside to be loose where the old mortar has gone to dust.

I’ve removed all loose with a vacuum and want to fill it with some kind of a pour in solution.

Does anyone have any experience of this or can recommend a product.

I don’t want to be removing all loose and bit by bit brick laying in the void. Cheers

 

[Deleted member 323070]

I think what you need is more of a grout.
These are available in different compounds, e.g an epoxy grout, a cement grout, and others.
Cement based grout is probably the cheapest.
I assume you would mix to the consistency required with a cement based grout. Whereas epoxy grouts are mixed in specified proportions.

There's a good guide to the options here:

https://thepavingexperts.co.uk/which-is-the-best-grout-for-a-patio/

 

[FiveKnuckleShuffle]

I think what you need is more of a grout.
These are available in different compounds, e.g an epoxy grout, a cement grout, and others.
Cement based grout is probably the cheapest.

Hi Tom, Thanks for your reply. A Grout you say? I would never have thought to even google for a grout solution.
In my old mind thats just for tiling lol

Is it like the below tile adhesives? thanks

 

[Deleted member 323070]

It's not an adhesive that you want, it's a grout, as in the link I provided in the first post.
Here's one option:

https://thepavingexperts.co.uk/product/fuga-pave-part-c-cement-based-hybrid-paving-grout/

Here are a few others:

Cement Based Grout

Coloured Grout for Tiles - Mapei Ultracolour, Ultra Tile Fix Pro Grout, suitable for internal and external use

pureadhesion.co.uk

Here's a more expensive, but more appropriate product:

https://www.uk.weber/webertec-ep-pourable-grout

 

[FiveKnuckleShuffle]

It's not an adhesive that you want, it's a grout, as in the link I provided in the first post.
Here's one option:

https://thepavingexperts.co.uk/product/fuga-pave-part-c-cement-based-hybrid-paving-grout/

Here are a few others:

Cement Based Grout

Coloured Grout for Tiles - Mapei Ultracolour, Ultra Tile Fix Pro Grout, suitable for internal and external use

pureadhesion.co.uk

Here's a more expensive, but more appropriate product:

https://www.uk.weber/webertec-ep-pourable-grout

Ahh. Think you must have edited post and added the link later lol

 

[Deleted member 323070]

Ahh. Think you mujst have edited post and added the link later lol

Yes, sorry.

 

[FiveKnuckleShuffle]

Wow. £270 delivered for 26kgs of Webertec. Nearly spat my coffee out lol

 

[FiveKnuckleShuffle]

Would something like this do it? I've never had a bad product of Sika before. Thanks again

Sika Sikagrout 111 GP Flowable Cementitious Grout Bedding Compound 527763 | Sealants and Tools Direct

Discover Sika Sikagrout 111 GP Flowable Cementitious Grout. Achieve precise bedding with Sealants & Tools Direct. Shop now for quality grout solutions.

www.sealantsandtoolsdirect.co.uk

 

[Deleted member 323070]

That'll work.
If you're doing several bags, start with a thicker mix so that the grout doesn't completely get lost to the bottom. And subsequently use a thinner mix as the voids fill up.
You will be surprised how it finds its way through any gaps. And you arrive at a level finish at the top.

Edit: I notice in your first post, you talked of a draught. The hole or crack or whatever that is allowing the draught to enter the wall might allow the grout to escape.
If you can find it, plug it. Otherwise your grout might end up on the floor.

 

[FiveKnuckleShuffle]

That'll work.
If you're doing several bags, start with a thicker mix so that the grout doesn't completely get lost to the bottom. And subsequently use a thinner mix as the voids fill up.
You will be surprised how it finds its way through any gaps. And you arrive at a level finish at the top.

Edit: I notice in your first post, you talked of a draught. The hole or crack or whatever that is allowing the draught to enter the wall might allow the grout to escape.
If you can find it, plug it. Otherwise your grout might end up on the floor.

Its going to be difficult to apply a sealer to all the sandstone bits though before I start the grout pour. Actually thinking about just pouring it in whilst moving along the area with the bucket. Not sure how else to remove any absorbant areas bar pulling out every stone piece from the void.

 

[opps]

Why not use plastering sand and cement?

Plastering sand retains more "body" than regular builder sand.

Way cheaper.

I, personally, would back fill with expanding foam and then level it off.

 

[freddiemercurystwin]

Sika is a massive international brand who can be trusted.

 

[yorksbuilder]

Would something like this do it?

Yes. Ensure you plug all the gaps and fill voids with expanding foam first and shutter the room side to your desired level. That stuff is the bomb but it is runny

 

[endecotp]

You don’t necessarily want to fill all the voids with something solid; in a stone wall, voids improve the thermal efficiency. Of course the stones need to be secure enough for the wall to not fall down. But you do want to stop draughts. I’d be tempted to mortar together the top layer of stones and not fill below there.

 

[FiveKnuckleShuffle]

Yes. Ensure you plug all the gaps and fill voids with expanding foam first and shutter the room side to your desired level. That stuff is the bomb but it is runny

Shutter the room side?