Description
Ecologic Sand Mastic Platinum is a traditional, flexible type of mortar, specifically for sealing gaps and joints between wooden substrates, such as window and door frames, and the surrounding masonry. The finished product is a waterproof mastic that retains some flexibility to absorb the difference in natural movement between the two substrates, preventing cracks and reducing water ingress.
Made from a dry, powdered blend of hydraulic lime and well-graded sands, Sand Mastic is designed to harden slowly but remain flexible, reducing the risk of cracking when forming joints.
Mixing
Mix Ecologic Sand Mastic Platinum as needed with a combination of Purified Raw Linseed Oil and Purified Boiled Linseed Oil. A 50/50 mix of raw and boiled linseed oil is prepared first, just before mixing with the Sand Mastic powder. The final consistency should be stiff enough to place and tool within a joint and remain standing up, in place, on its own.
Approximate Mixing Ratios
Ecologic
Sand Mastic
|
Raw
Linseed Oil |
Boiled
Linseed Oil |
| 1 gal |
~ 3⁄4 cup |
~ 3⁄4 cup |
| 5 gal |
~ 1 quart |
~ 1 quart |
Application
Ensure all surfaces are clean and dry and free of any water, debris, and other oils. Any damage to the adjacent masonry should be repaired first with a mortar or masonry filler. A hawk and pointing iron can be used to apply the Sand Mastic. Use a smooth stainless steel trowel to achieve the desired finished profile.
Backing material, such as Traditional Oakum Caulking, should be packed into the gap or joint at least 3⁄4 inch deep but not deeper than 2 inches. Priming raw wood jambs and the backing material can be accomplished by using the 50/50 Linseed oil blend just prior to installing the Sand Mastic.
The Mastic doesn’t require painting, but if you do want to paint it, Linseed Oil Paint is recommended.
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