NHL 2:
terrachaux
NHL 2 (Terrachaux) brings the qualities of natural hydraulic lime to interior and exterior work on weak structures and earthworks.
Application and specification schedule for NHL 2
Restoration and conservation work:
Mixing: Can be mixed in cement mixers
Application by spray gun: Possible. Please consult us.
Working temperatures: Not below 8°C nor above 30°C. Make sure that high suction materials are thoroughly dampened before application. Avoid rapid drying due to high temperatures or strong winds by curing with a light water mist several times a day if necessary. Protect from frost, rain, direct sun and strong wind for a minimum of 96 hours.
Mortar composition on strong supports:
Masonry/pointing: 1 volume of NHL 2 : 2 volumes of sand
Choose well graded sands (3mm: 75microns)
Rendering:
On earth or friable supports. After preparation and cleaning, dampen with a 1:20 solution of NHL2 / water applied in 2 coats.
A. Scratch coat (3 - 4mm) 3 volumes of NHL 2 : 5 volumes of sand
This coat is applied by casting on to a still damp but not over saturated support and is left as cast to provide good keying.
B. Undercoat (15 - 20mm) 1 volume of NHL 2 : 2 volumes of sand
Can be applied in 2 passes of at least 1cm. Second pass only after first is reasonably dry.
C. Finishing (5mm) 1 volume of NHL2 : 2.5 volumes of sand
The dosage / thickness may vary in accordance with the desired finish and the sand used. In smooth floated finishes if very fine sands containing clay are used the binder (NHL) quantity will be reduced.
For additional information on this and other St. Astier lime products, please visit the St. Astier website.
hydraulic limes 
introduction
why NHLs?
manufacture
NHL 5
NHL 3.5
NHL 2
ecomortar
prompt