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The ThermaTech System

Founder of Preservation Works Ltd., Rob Wozniak, gently removes 100+ years of carbon deposits while preserving the stone’s natural patina, which avoids an over-cleaned or sandblasted look that a regular power washer might create.

To learn more about the ThermaTech cleaning system, visit our masonry cleaning services!

Learn About Our Products

Our Products

  • Natural Hydraulic Lime
  • Natural Cement
  • Gypsum Lime Plaster

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Natural Hydraulic Lime (typically NHL 3.5) mortar should be used – rather than cement – for historic homes or buildings made of brick or stone.

We not only sell, but we use these binders/specialty masonry products imported from Europe that have been used for thousands of years in traditional building & are now being used in modern & “green” construction due to their high quality, reasonable cost & minor environmental impact!

Tigre Natural Hydraulic Lime (NHL) 5.0 for sale at Preservation Works Ltd/

Tigre Natural Hydraulic Lime (NHL) 3.5 for sale at Preservation Works Ltd/

Lime-Based Attributes

  • HISTORICALLY APPROPRIATE, which is important when repairing a historic structure for durability & to visually match the new to the old as much as possible
  • SELF-HEALING: has the ability to close cracks, further protecting the building from water intrusion or more dramatic damage to mortar.
  • VAPOR PERMEABLE: allows moisture to evaporate, preventing mold generation & ensuring bricks won’t crack/break during freeze/thaw cycles.
  • LESS COMPRESSIVE STRENGTH than cement: acts as a buffer between bricks; as bricks move & settle, mortar shifts to accommodate changes, keeping bricks intact
  • HIGHER BOND STRENGTH than cement, which protects from seepage & erosion
  • ENVIRONMENTALLY FRIENDLY: “green” product, made entirely from and by nature

Our Services

Using our knowledge & skills from historic work, we apply similar techniques & materials for new construction offering clients a rich, natural and healthy aesthetic in their home, a soulful alternative to sterile, machine-made construction.

Services We Offer

Masonry Coatings

  • Removal of Portland Cement, brick coat, toxic lead paint & water-proofing
  • Application of lime wash, Potassium silicate, stucco, masonry paint, stains & water repellents


  • Interior & Exterior (Stucco) Application
  • Use of Natural Hydraulic Lime (NHL)
  • Decorative & Ornamental Plaster
  • Custom finishes & pigment options


  • Mortar analysis & matching
  • Careful removal of mortar & replacement with historically appropriate mortar
  • Use of NHL, local sand, clay & pigments
  • Different finishes & colors available


  • Mortar analysis & matching
  • Design & development
  • Product installation training
  • Tool & material advice