Our mica and pyrite repair services restore the safety and appearance of cracked walls caused by defective materials
Please note this service will not fix Mica/Pyrite, it will only slow down the effects. This service works best when cracks are narrow and is less effective when cracks have become wider. Early treatment is the most effective.
By cleaning cracks, applying a mastic and a flexible, fibre slurry, the effects of mica/pyrite can be slowed down. This is applicable for those who can't avail of the Mica Redress Scheme, such as, non-primary residence owners, holiday home owners, or those not wanting to join the scheme just yet.
The most common and visible sign is the appearance of cracks in exterior walls. Cracks can vary in size and often run horizontally, vertically, or in a stepped pattern. Over time, they may grow larger or increase in number.
Stress points around openings (like windows and doors) are often the first places to show cracks. These cracks may start off hairline-thin and widen as the underlying blocks deteriorate.
Cracks can also appear on internal walls or plaster finishes. Sometimes, internal cracks mirror external wall cracks, especially near the same structural points (e.g., windows, corners, door frames).
The first and most important step is to have a chartered structural engineer (ideally one familiar with mica issues) inspect your home.
Water ingress accelerates the deterioration of mica-affected blocks. Ensure your roof, gutters, downpipes, and window/door seals are intact and functioning properly. Filling or sealing exterior cracks may help reduce water penetration. Seek advice on the best product to use.
Keep the interior well-ventilated to reduce condensation and humidity, which can also exacerbate structural issues over time. In very damp climates or parts of the house (e.g., basements), use dehumidifiers to maintain lower moisture levels.
Often, partial or full replacement of affected walls (or entire homes in severe cases) is the only reliable long-term fix.
It’s important to note that this method serves primarily as a temporary or cosmetic measure. For significant or ongoing cracking, always consult a professional structural engineer to confirm there are no immediate safety concerns and to get advice on longer-term solutions.
We assess whether the cracks in your building are structural or not. Only superficial cracks can be addresses by filling. We check for signs of dampness or water penetration around the crack. If the area is repeatedly wet, it’s crucial to resolve any water entry issues—e.g., faulty gutters or poor drainage—before filling the crack.
We make sure the crack is as clean and dry as possible. It may be prudent to widen some cracks to allow filler to adhere better.
We apply a mastic and a flexible, fibre slurry to fill each crack to a smooth, flush finish that will shed water effectively.
Once the filler is fully cured and dried, we may apply a suitable exterior paint to match the surrounding finish. We use a weather-resistant exterior paint or coating to provide additional protection against moisture.
