Re-pointing internal fireplace

[Fraz]

Hi,

I've recently exposed the original fireplace in my living room and the brickwork of the chimney brest. (its a c. 1900 victorian terrace, stone faced external skin, but red brick internal.)

I'm going to leave the brest as exposed brickwork, but the pointing is a bit messy and has come out in parts, so I'm going to re-point.
Been reading lots and lots of information on re-pointing, but can't seem to find any info on internal pointing. I'm also not sure what the existing pointing is made up of, seems too hard for lime?
So.. Should what material should i be using lime, NHL, sand and cement with lime..... And what mix is appropriate internally.

Any advice or suggestions would be appreciated.

 

[a twig]

Looks like cement at present, ideally rake out and repoint in NHL, preferably 2 but 3.5 is ok if that’s all you can get. I’d use a 1 NHL to 3 builders sand mix

 

[a twig]

Start the raking out in an inconspicuous area, if it causes damage to the bricks then you might need to think again

 

[Lacan07]

Alternatively if you live near one of the well known lime seller outlets you could opt for an NHL pre-mix (just add water). You won't need many bags for re-pointing. Whatever you opt for make sure you keep the mix as dry as possible (dampen the brick), if the lime gets on to the face it can stain and you'll have to scrub it off with a wire brush.