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NHL Render – Guide

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 SG3-5mmMix
1B – Sand SG10-15mm
Mix 1C – Sand SG5-10mmMix
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 LathMix
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
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*3-5mmMix
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.
LimeMix
A
1:1.5
Mix B
1:2
Mix C
1:2.5
Mix
D
1:3
Mix E
1:4
NHL 21A1B1C1D1E
NHL
3.5
2A2B2C2D2E
NHL53A3B3C3D  
SandsTypeParticle
sizes
SGSharp gritty 5mm
down to 0.075
SCSharp coarse3.35mm down
to 0.075
SMSharp medium2.36mm down to
0.075
SFSharp fine1.18mm down to 0.075
FSFine
soft
0.8mm down to 0.075
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.

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