Stone Replacement

This work should be carried out when there is significant cracks or decay within the stone. Window stones for example have an important structural role within a building. Defects within these should be addressed as soon as possible.

When evaluating the condition of a stone, several key factors should be considered:

  • Extent of Surface Decay: How much of the stone’s surface has deteriorated?
  • Length and Width of Cracks: Are there cracks running through the stone, and how significant are they?
  • Missing Pieces: Are there any parts of the stone missing?
  • Location and Structural Role: Where is the stone located, and what role does it play within the building or structure?

Causes of Surface Decay

Surface decay can result from several factors, including:

  • Weathering: Over time, exposure to the elements can cause stones to deteriorate.
  • Improper Materials: The use of cement materials around or covering the stone can accelerate decay.
  • Incorrect Bedding: Stones should be laid with their layers horizontal and facing downwards. If built on the wrong bed, with layers vertical and facing outwards, the stone is more susceptible to freeze-thaw action and natural delamination.

Superficial surface decay may be repaired. This is a cost-effective way to restore a stone’s structure and longevity. Although a properly applied repair can last 10-20+ years, it is temporary and will eventually detach from the original stone. For this reason, we usually avoid repairing stones directly over walkways and doorways, especially at higher levels of a building.

A stone with surface decay exceeding 10mm from the original face should be replaced. Lithomex is designed to bond to stone with a coat no thicker than 10mm. It also has to be applied to a solid surface; therefore, a soft, crumbling stone should always be replaced. This is commonly referred to as internal decay.

Signs of Internal Decay

  • Hollow Sound: The stone sounds hollow when tapped.
  • Penetration: When cutting into the stone, there’s no resistance, and the chisel or pick can penetrate deeply.
  • Crumbling Stone: The stone crumbles by hand.

Our Approach

At Newtown Stone Repairs, we take a comprehensive approach to assessing and replacing defective stones.

Our team carefully evaluates each stone’s condition and determines the best course of action to ensure the longevity and integrity of your building or structure.

Before/after examples

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