| Background Prepare background Re-point and dub out as necessary with compatible mortar. |
Stipple Coat Cast or sprayed on only Must be used on poor suction, dense / smooth surfaces. Leave as Cast Cure 2 – 4 days |
First Coat Cast, spray or lay on. Well-keyed background. Control suction. Leave Keyed Cure 4 – 7 days |
Second Coat Cast, spray or lay on. Control suction. Straightening coat. Leave keyed. Cure 7 – 10 days. Finishing coat in 2 coats work. |
Finish Cast, spray or lay on. Control suction Finish as required. Cure min 3 – 10 days |
| Cob / Earth |
Mix 1A – Sand SG3-5mm | Mix 1B – Sand SG10-15mm |
Mix 1C – Sand SG5-10mm | Mix 1C – Sand SF / FS3-5mm |
| Wooden Lath |
Mix 2B/3B – Sand SC12-15mm (8-10 cover) |
Mix 2C – Sand SC8-10mm |
Mix 1C – Sand SF3-5mmMix 2C – Sand SM5-8mm |
|
| Metal Lath | Mix 3B – Sand SC10-15mm (8-10 cover) |
Mix 2B – Sand SM10-20mm |
Mix 1C – Sand SF3-5mmMix 2C – Sand SM5-8mm |
|
| Soft Brick / Stone
Porous |
Mix 1B – Sand SC10-15mmMix 2B – Sand SC10-15mm |
Mix 1B/C – Sand SC/SM10-12mmMix 2B/C – Sand SC/SM10-12mm |
Mix 1C – Sand SF3-5mmMix 2C – Sand SM5-8mm |
|
| Medium Brick / Stone / Blocks |
Mix 2A/3B – Sand SG*3-5mm | Mix 2B/3C – Sand SC10-20mmMix 2B/3B – Sand SG**10-15mm |
Mix 2C/3D Sand SC/SM8-12mmMix 2C/3C Sand SG**6-10mm |
Mix 1C – Sand SF3-5mmMix 2C – Sand SM5-8mm |
| Dense Brick / Stone/ Blocks/ Concrete |
Mix 2A/3A -Sand SG3-5mm |
Mix 2B/3C – Sand SC10-20mmMix 2B/3B – Sand SG**10-15mm |
Mix 2C/3D Sand SC/SM8-12mmMix 2C/3C Sand SG** 6-10mm |
Mix 1C – Sand SF3-5mmMix 2C – Sand SM5-8mm |
|
NHL
binder : sand mixes (by volume) |
* Stipple coat optional, depending on background suction and conditions. ** For harling applications. Note: a wide variety of finishes can be achieved by adopting different binder and sand mixes to satisfy all requirements. Coat thickness and optional mix ratios are related to exposure and background conditions and are the responsibility of the designer. Curing and protection must follow best working practice. |
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| This document is a guide only and is not intended to be a specification. Its purpose is to provide the reader with helpful information that may assist in determining the correct choice of materials, methods of application and the best working practice. The guidelines refer to our experience with St. Astier NHL binders and some recommendations might not be applicable to other products. |
