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Speak to Masons Mortar in Scotland. I would not use hot lime or putty lime mortar, (fat lime), especialy at this time of year. It would need to be monitored for days or even weeks, keeping off the wind, sun and cold, usualy using damp hessian. If you buy premixed hydraulic mortar it can, depending on the brand, be treated like cement mortar. I suspect they add lots of additives as it is much easier to use than bagged hydraulic lime mixed with sand.
I fit all my windows with NHL 3.5 premixed hydraulic lime mortar. Needs keeping damp, above 5C for 3-5 days, but will start setting within hours rather than days for fat lime mortar.
Burnt sand mastic is used instead of silicon to. Form a final fillet on the outside.
I use Vimark here in Italy, very easy to use, instructions are also in English so may be available in the UK.
When I lived in Ireland I would buy St Astier lime and mix it with sharp sand but it was far more difficult to look after.

<blockquote data-quote="pgrbff" data-source="post: 1771770" data-attributes="member: 34872">Speak to Masons Mortar in Scotland. I would not use hot lime or putty lime mortar, (fat lime), especialy at this time of year. It would need to be monitored for days or even weeks, keeping off the wind, sun and cold, usualy using damp hessian. If you buy premixed hydraulic mortar it can, depending on the brand, be treated like cement mortar. I suspect they add lots of additives as it is much easier to use than bagged hydraulic lime mixed with sand. I fit all my windows with NHL 3.5 premixed hydraulic lime mortar. Needs keeping damp, above 5C for 3-5 days, but will start setting within hours rather than days for fat lime mortar.Burnt sand mastic is used instead of silicon to. Form a final fillet on the outside.I use Vimark here in Italy, very easy to use, instructions are also in English so may be available in the UK.When I lived in Ireland I would buy St Astier lime and mix it with sharp sand but it was far more difficult to look after.</blockquote>

[QUOTE="pgrbff, post: 1771770, member: 34872"] Speak to Masons Mortar in Scotland. I would not use hot lime or putty lime mortar, (fat lime), especialy at this time of year. It would need to be monitored for days or even weeks, keeping off the wind, sun and cold, usualy using damp hessian. If you buy premixed hydraulic mortar it can, depending on the brand, be treated like cement mortar. I suspect they add lots of additives as it is much easier to use than bagged hydraulic lime mixed with sand. I fit all my windows with NHL 3.5 premixed hydraulic lime mortar. Needs keeping damp, above 5C for 3-5 days, but will start setting within hours rather than days for fat lime mortar. Burnt sand mastic is used instead of silicon to. Form a final fillet on the outside. I use Vimark here in Italy, very easy to use, instructions are also in English so may be available in the UK. When I lived in Ireland I would buy St Astier lime and mix it with sharp sand but it was far more difficult to look after. [/QUOTE]

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