Open fireplace – cracks in fireplace surround

Causes

Thermal expansion and contraction

Building movement

Chimney settlement

Listed under: heating, Services, chimneys and flues and fireplaces

Cause

Thermal expansion and contraction

Repair

  • if you wish to continue using the fireplace, consult an experienced building surveyor or a chartered professional engineer to confirm the cause of the crack and for advice on what to do. In some cases a simple repair may be possible, but cracks may also indicate structural problems and that the fireplace is unsafe to use. Failing to take action may void your house insurance if there is a house fire
  • open fires are an extremely inefficient form of heating – much of the heat goes up the chimney rather than into the room. If the fireplace has been used for heating a room, consider switching to a more efficient option such as a heat pump. Low-income homeowners can get a Government grant for up to 80% of the cost (up to $3000 incl GST) of an approved heat pump or wood/pellet burner for the main living area
  • assess whether the cracking is just part of wider deterioration around the fireplace/chimney. Older chimneys that are no longer structurally sound are dangerous, particularly in an earthquake. (Pre-1930s buildings commonly used a weaker type of mortar.) Engaging a chartered professional engineer to assess and advise on options to restrain, strengthen, demolish or rebuild the chimney is recommended
  • if a decision is made to take down the chimney, this does not require a building consent. This exemption is limited to any building up to 3 storeys high as long as the removal does not affect the primary structure, any specified system or any fire separation (which includes firewalls protecting other property). Remember to check roof sarking/framing which is sometimes supported on chimney structures
  • any repair work that is necessary after chimney removal – for example, making good the gaps left in a roof – can also be done without a consent. The work must not leave the house in a worse position (in terms of thermal performance, durability etc.) than before the work was done
  • you should only attempt these repairs yourself if you have the skills, knowledge, experience and tools to complete the job properly. Poor quality work on the building exterior can result in leaks and other problems and may affect your house insurance cover

 

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Cause

Building movement

Repair

  • as for the first repair above. Consulting an experienced building surveyor or a chartered professional engineer is recommended

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Cause

Chimney settlement

Repair

  • as for the first repair above. Consulting an experienced building surveyor or a chartered professional engineer is recommended


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