repointing old bricks colour not matching

[mane1034]

Hi

my house is 1940 build and require some repointing in ceratin areas only.

i start repointing back wall using following mix

1 part cement
5 part sand
1/2 part lime

however i am struggling to matching pointing colour with existing pointing.

new pointing looks more greenish.

any help pls

 

[Charlie George]

If using cement you need to use White cement(snowcrete) and if sand is too red try using a washed sand instead, try a small mix as sample and give a day or two to dry.
Jim

 

[stuart45]

Hi

my house is 1940 build and require some repointing in ceratin areas only.

i start repointing back wall using following mix

1 part builder sand
5 part sand
1/2 part lime

Are you putting any cement in?

 

[mane1034]

Are you putting any cement in?

my mistake just corrected it.

1 part cement
5 part sand
1/2 part lime

 

[stuart45]

Are you sure the original is not a lime mortar. In the 40's some builders were still using lime mortar, others were gauging cement into the mix.

 

[Astra99]

Don't forget that cement produced at different works can be vastly different colours when dry. For example, Blue Circle's Westbury cement was very light in colour, but that produced at Northfleet works was noticeably darker. If I remember correctly, Ketton Cement used to have a greenish tinge. As Charlie George said (above) Snowcrete might be your best bet.

 

[datarebal]

it needs a bit of a rake out before pointing, that is one of the reasons your struggling to get a nice finish.
forget the cement, use N H lime and an aggregate of suitable colour which should give you a good shade and help preserve your bricks.

 

[mane1034]

I purchased bag of hydrated lime. Can I just use that with builder sand? See below link.


What ratio of mix should I use?


https://www.diy.com/departments/blu...gclsrc=aw.ds&dclid=CLefj5iVhd0CFYYh0wodw7ULDQ

 

[stuart45]

forget the cement, use N H lime and an aggregate of suitable colour

Your lime is not NH.

 

[mane1034]

Do i need lime 3.5 or 5 as it seems differnt ones available?

 

[darrington]

The thing is, although you can hopefully get it to look similar, you'll never get it to look exact. The same applies to patching roughcast, render etc, or any other patching job, where the original was done years earlier, with materials from that era,
The only way to get an exact colour, would be to rake out, and repoint the whole lot, using the same "ACCURATELY MEASURED" mix ratio, same colour sand etc. A lot more work I know, but if it's the finished look you're after,. then well worth it.

 

[mane1034]

I understand i will not be able to match colour 100%


Can any one provide link which NHL TYPE i have to buy. Also
What should be the mix ratio with sand

Thanks

 

[stuart45]

NHL 3.5 mixed at 3/1 sand/lime

 

[datarebal]

NHL 3.5 mixed at 3/1 sand/lime

I would go with that.

 

[datarebal]

I purchased bag of hydrated lime. Can I just use that with builder sand? See below link.

No