If like me you own and/or are restoring a Heritage property and do not have a huge amount of proper past knowledge and experience, I would strenously recommend you do the following things - especially if you are thinking of buying an old house, or have recently done so.
1) Buy this book
heritage-survey.org/about-us
2) If you get stuck and need a person to speak to, phone the SPAB (Society for the Protection of Ancient Buildings) technical advice line.
Opening hours: Monday - Friday, 9.30am - 12.30pm
Phone number: 020 7456 0916
3) Never ever work with/hire/contract anyone who in discussions triggers these cowboy-bingo phrases.
- That wants a damp proof course !
- Tank the walls !
- Concrete is fine, its waterproof - ideal !
- Lime is old fashioned, nobody bothers with that now.
- Lets paint your stone with Stormshield, that will keep the water out !
- Lets get some silicon sealant on those gaps
4) Go and watch anything online by Nigel Copsey, he`s spent his life researching correct original lime mortars.