NHL 2
Virginia Lime Works NHL 2 is a Natural Hydraulic Lime for Historic Preservation, New Construction and Ecologically Friendly Building. Of the four Natural Hydraulic Limes available through Virginia Lime Works NHL 2 offers low compressive strengths, high vapor permeability, high sulfate resistance, high rates of carbonation, a bright white color, and excellent workability.
Where to Use
The softest of our Natural Hydraulic Limes can be used in laying, bedding, or repointing brick and stone masonry, external renders/stuccos and internal plasters, grouts, and limewater consolidation.
TECHNICAL INFORMATION
Components
NHL 2 is made by burning a unique French limestone that is infiltrated with silica and alumina and conforms to the European Standard EN:459. This product contains no cement, latex, or acrylic admixtures. NHL2 is supplied in 50 lb orange/white paper sacks and in pallets of 49 bags.
Compressive Strengths (see printable datasheet)
Technical Information (see printable datasheet)
Preparation
On the day prior to working control absorption by thoroughly dampening substrate by fine mist spray (depending on conditions this may entail dampening for additional time). Ensure there is no standing water or over-saturation before application. If the substrate is retaining moisture it may be attributed to various conditions which would need to be corrected before work begins. Issues such as detailing, positive drainage, etc. should be dealt with before any work commences.
Mixing Directions
Mix 1 portion of NHL 2 with determined portions of sharp, clean, and well-graded sand and water. Blend thoroughly and add water slowly to achieve a workable mix. Take care when adding water whereas too much water will expand your mix and cause potential problems such as shrinkage cracks and frost damage.
For Mechanical Mixing in a standard paddle mixer: Add lime and water together to make a paste, add sand slowly and then additional water to desired consistency.
Application
Please see individual guidelines available from Virginia Lime Works for your specific application
After-Care
Protect work from drying winds, frost, direct sun, and rain for at least 7 days although some conditions may deem it necessary to cure for longer periods of time. Allow the mortar to cure slowly during this time by protecting with burlap, plastic, and fine mist spray if necessary. If working in freezing conditions, care must be taken that the mortar does not freeze during its curing (which may entail protection for extended periods of time).
Coverages and Consumption (see printable datasheet)
Clean Up
Ensure that all work is properly protected prior to cleaning. Maintain clean surfaces on the face, sills, ledges, and projections of masonry on a daily basis. Tools can be cleaned using conventional methods and properly protect any unused product from moisture and freezing. Opened bags of NHL2 can be stored in sealed pails for up to 6 months from date of purchase.
Protect eyes, nose, and skin. Work in well ventilated areas.
Store unopened containers away from direct sunlight and moisture, between 40°F-85°F. NHL2 can be stored for approximately 9 months from date of receipt.
Not for internal consumption. Keep out of the reach of children and animals.
Alternate products
NHL3.5G, NHL3.5W, Limestone Lime Putty, Oystershell Lime Putty
Additional References
NHL2 Material Safety Data Sheet, Guide to Natural Hydraulic Limes.
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