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FAQs - Masonry and Mortars

Our customer service department answers many questions regarding our lime products for all the industries we serve. The questions range from lime applications and use to storage, shipping and handling. As a resource to our customers and website viewers, the listing below represents the most frequently asked questions.

What ASTM Specifications does Rockwell's products conform to?

C-207 – Standard Specification for Hydrated Lime for Masonry Purposes

  • Miracle Morta-Lok – Type “S” Masons Lime – Bagged/Bulk

  • Miracle E-Z Spread – Type “SA” Stucco Lime – Bagged/Bulk

  • Miracle Lime –Cote – Type “S” Finish Lime – Bagged/Bulk

C-206 – Standard Specification for Finish Hydrated Lime

  • Miracle Lime – Cote – Type ”S” Finish Lime

What is the difference between Type “S” Lime and Type “S” Mortar?

Type “S” mortar is a blend of cement, lime, and sand either by proportion or property that meets Standard C-270 where Type “S” lime is just one of the ingredients of the mortar.

What advantages does Type “S” Lime add to a Portland/Lime mortar?

  • Prolonged board life and workability

  • Good water retention

  • Maximum sand yield

Do cement/lime mortars work with all types of building materials?

Lime/Cement mortars have excellent compatibility with all types of clay bricks and concrete masonry units.

Do mortars made with lime /cement have better potential for reduced water penetration?

Studies have shown that lime/cement mortars minimize the potential for water penetration. (A copy of these studies available upon request) through better extent of bond and autogenous healing.

What is Autogenous Healing?

When hairline cracks develop in the mortar hydrated lime reacts with carbon dioxide in the atmosphere. This reaction produces limestone which helps to seal the crack and fill the voids in the mortar. This explains the increased moisture resistance noted after six months of curing in two studies.

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