NHL Renders - Some recommended mixes
St Astier Natural Hydraulic Limes (NHL)
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
Cast, spray or lay on.
Control suction. Leave Keyed
Cure 4-7 days
Cast, spray or lay on. Control suction. Straightening coat.
Leave keyed. Cure 7-10 days. Finishing coat in 2 coats work.
Cast, spray or lay on.Control suctionFinish 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 / StonePorous Blocks||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|
|* Stipple coat optional, depending on background suction
** 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.
|For further Guidance, contact your St Astier Distributor.