Need to do some repairs to the roof of an old building. There is a big bit of roofing missing so I need to do a bit of pointing and fit a new wall plate before I tackle the roof. Its rubble stone with lime mortar. Quite rustic. What mortar mix do I want and what lime should I buy? Any tips appreciated. I've done a reasonable bit of brick and block work with cement but this'll be my first go with lime.
Mortar for lime and rubble wall
- Thread starter nickjb
- Start date
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If you want to match existing mortar/pointing, it's going to be quite a job to colour match.
The sand used in the original usually give the finished colour. You can colour match using pigments, but it's a lengthy experiment. The depth of the pointing can also affect the finished dry colour.
For a hydraulic lime, external pointing, I would use a NHL 3.5 on exposed faces. Less exposed possibly, and internally a NHL 2.0.
Don't use a soft sand, and use a 3:1 mix. Less water and more mixing, a lot more mixing.
I know it's an old thread, but anyone coming here to get info about Lime mortar mixes should be aware : You must wear eye protection as well as gloves when using lime. The floating dust or occasional splash in your eye will eventually ruin your eyesight, even if it doesn't do so by burning your eyes, the lime gets absorbed and saponifies (turns to soap) the fats that keep the workings of your eye flexible.
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D
dontbelieveawordofit
not to mention what you may inhale.
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