Victorian homes are architectural masterpieces, distinguished by intricate trim, turrets, and rich masonry. At Bedford Fine Art Gallery, we appreciate the importance of preserving their historical integrity.
If you own a Victorian home, you know restoring Victorian houses requires care and attention. One critical aspect often overlooked in favor of convenience is brick repointing, which can have serious consequences if done incorrectly.
When mortar between historic bricks deteriorates, quick repairs may seem appealing. However, material choice is critical. For 19th-century brickwork, always use lime mortar, not Portland cement.
Below, we explain why repointing historic brick requires specialized skill and why modern cement is unsuitable for Victorian homes.
The Problem: Modern Cement is Too Hard
Understanding why cement is harmful requires examining Victorian-era building techniques. Bricks from the 1800s and early 1900s were kiln-fired at lower temperatures, making them softer, more porous, and able to expand and contract with weather changes.
Portland cement, widely used since the mid-20th century, is rigid and dense. Using it with soft historic bricks creates a structural mismatch. As the house shifts and settles, the inflexible cement transfers stress to the bricks, causing them to crack.
The Silent Killer: Trapped Moisture and Spalling
A major issue with Portland cement in historic restoration is that it does not "breathe."
Older homes were designed as breathable systems. Moisture from rain, snow, and older homes was designed to be breathable. Moisture from rain, snow, and humidity enters the masonry, and historic lime mortar draws it out of the bricks, allowing it to evaporate safely. The moisture enters the porous brick but cannot escape through the mortar joints. It becomes trapped inside the brick itself. When winter arrives and temperatures drop below freezing, that trapped water turns to ice and expands. This leads to spalling—a heartbreaking process in which the entire face of your historic brick pops off, eventually causing it to disintegrate into dust.
The Masterpiece: The Magic of Lime Mortar
For centuries, masons used traditional lime mortar, a mixture of lime putty, sand, and water. This is the material originally used in Victorian homes and should be used for restoration.
Why is lime mortar so perfect for historic homes?
- It breathes: Lime mortar is highly permeable. It draws moisture away from the bricks and allows it to evaporate safely.
- It is flexible: Lime mortar is softer than historic brick, accommodating natural movement without causing cracks in the masonry.
- It is self-healing: Lime mortar has a property called "autogenous healing." When small cracks form, moisture dissolves free lime, which is then redeposited as the water evaporates, naturally repairing the fissure.
Repointing as an Art Form
Repointing a Victorian home requires skilled craftsmanship. Old mortar should be removed carefully by hand with specialized tools to protect the bricks. The new lime mortar must be color-matched to the original, considering the local sand's color and aggregate size. The joint profile, whether struck, flush, or beaded, should be replicated to maintain the original architectural style.
Preserving the Canvas
At Bedford Fine Art Gallery, we believe true preservation means respecting original materials and the creator's intent. Your Victorian home is a piece of history, and its exterior protects its legacy.
Using traditional lime mortar does more than repair a wall; it helps ensure your home's historic masonry remains strong and attractive for generations, while blending modern comfort.
After your home's exterior is restored, consider enhancing the interior. Visit Bedford Fine Art Gallery to find 19th-century artworks that complement the elegance and charm of your Victorian home.
