Brick slips and lime mortar

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Bogart
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Location: Norfolk

Brick slips and lime mortar

Post by Bogart » Thu 3rd Sep, 2020 11:19 am

Am going to be doing one of the kitchen walls with brick slips. I intend to use white lime mortar can anybody see problems with this as opposed to a standard coloured mortar?

Zebra
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Location: St Albans, Hertfordshire

Re: Brick slips and lime mortar

Post by Zebra » Thu 3rd Sep, 2020 11:52 pm

How do you make white lime mortar?

Bogart
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Location: Norfolk

Re: Brick slips and lime mortar

Post by Bogart » Fri 4th Sep, 2020 9:33 am

By working it a lot in the joint the lime comes to the surface.

TheForge
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Re: Brick slips and lime mortar

Post by TheForge » Fri 4th Sep, 2020 11:55 am

You can use a very white lime like Buxton and mix with chalk or marble dust. If you need more body fine silica sand won’t add much colour.

Over working the mortar just brings a lime bloom to the surface to form a crust.

a twig
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Re: Brick slips and lime mortar

Post by a twig » Fri 4th Sep, 2020 4:52 pm

TheForge wrote:
Fri 4th Sep, 2020 11:55 am
You can use a very white lime like Buxton and mix with chalk or marble dust. If you need more body fine silica sand won’t add much colour.

Over working the mortar just brings a lime bloom to the surface to form a crust.
What this man says 100%, I've also found that NHL seems to dry "whiter" than fat, I used a premix NHL mortar from conserv that was properly white, ideal for something more decorative. Excellent stuff, linked below and available in 10kg tubs up to 25kg bags.

https://www.lime-mortars.co.uk/lime-mor ... scarr/25kg

Bogart
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Location: Norfolk

Re: Brick slips and lime mortar

Post by Bogart » Sat 5th Sep, 2020 10:12 am

That is the sort I will use just wondered if suitable for brick slips but see no reason why not.

a twig
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Re: Brick slips and lime mortar

Post by a twig » Sat 5th Sep, 2020 12:30 pm

I assumed you'll be using a flexible tile adhesive or dedicated brick slip adhesive product to attach the slips and the NHL is just for the pointing?

In which case that will be fine.

Normal mortars (cement or NHL) won't bond the slip to the wall strongly enough though

Bogart
Posts: 334
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Location: Norfolk

Re: Brick slips and lime mortar

Post by Bogart » Sat 5th Sep, 2020 2:06 pm

Yes this is just for the pointing only. Years ago I used a pointing gun which I found to be not a lot of use, it used to squirt out a lot of water and leave a very thick mortar still in the tube. I wonder if they have improved?
Or maybe was just how I used it.

a twig
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Re: Brick slips and lime mortar

Post by a twig » Sat 5th Sep, 2020 4:10 pm

I've had better results with a bag and a wide nozzle, and making it slightly wetter than usual, never got on with the guns and lime mortar myself. Most of the time I just use hawk and finger trowel these days, particularly for brick where it is all straight lines.

I also bought a cheapo finger trowel and used a grinder to tickle it into a thinner shape with a point on the end and that's been great for ashlar etc

There is a company that makes a "gunlime" mortar that flows betters for guns etc, can't readily remember who but I posted on here ages ago about it. Probably not worth cost / hassle though

Bogart
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Location: Norfolk

Re: Brick slips and lime mortar

Post by Bogart » Mon 7th Sep, 2020 2:18 pm

Have been in contact with the lime mortars people you gave me the link to. At least they answer queries and they did mention that they have a gun suitable mortar. I am still sceptical on this as past experience was not brilliant.
As I am only doing one wall of the kitchen which amounts to around 190 slips maybe I will stick with the tried and tested method.

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