Cracked Walls


Cracked Walls

There are many reasons your property may have cracked walls, some of which are of little concern and are often just cosmetic in the plaster.

Cracks are a mechanism for releasing stresses which have built up within a structure, and they will naturally exploit inherent weaknesses in your home’s design.

Where some smaller cracks are nothing to worry about and could purely be down to the age of a property, some more serious cracks can indicate sinking or damaged foundations including or subsidence.

When to start worrying about larger cracks in your home

Cracks in plaster can sometimes be easily over looked but could be the first signs of a major structural issue. If problematic cracks in walls are not addressed quickly, the problem could get worse and could ultimately devalue the property should you look to sell it.

Some characteristics of larger cracks that are cause for concern include when two sides of a wall are at differing heights, when doors and windows have gaps around their frames and the cracks in question are wider than 5mm or you can insert your little finger in them.

Zig-zag or stepped cracks in brickwork which usually follow the mortar lines are also indicators of possible structural defects.  These could all indicate weaknesses in the building’s foundation and so you should seek expert advice.

What causes large cracks in walls?

When a building’s foundation shrinks or becomes weakened, large cracks may appear around windows and doors or at the corner of a room. This indicates that parts of, or an entire section of the building is sinking downwards; known as subsidence. This usually occurs when the foundation soil beneath the building has eroded or moved.

What are the likely causes of wall cracks?

Some homes are at a greater risk than others when it comes to subsidence. There are many geological, man-made and seasonal impacts to consider.

Some include:

  • Clay soil can shrink, crack and shift during hot, dry weather, and then expand during wetter months.
  • After a drought, a building’s footings can be impacted when sandy or fine gravel soil is much drier.
  • Trees and shrubs can also be a factor, particularly if they’re close to property foundations. Some species absorb a lot more water, making the soil much drier.
  • When the ground is flooded, it can saturate the house foundations and cause them to move.
  • Broken pipes including sewers and drainage.
  • Environmental issues including erosion, earthquakes and other geological activity

How Mainmark can help fix the problem?

Mainmark’s ground improvement and concrete floor re-levelling methods for house subsidence are effective for fixing cracks in walls in homes of any size.

The Mainmark team of experts will visit your home, assess the damage, and ascertain the cause. Our experienced engineers and technicians establish the underpinning approach needed, creating a plan specific to the needs of your home.

Houses that need to be re-levelled often develop cracks in walls, which can occur internally and externally. These houses require their foundations to be lifted and re-levelled. As the building is re-levelled wall cracks generally close, leaving only a little cosmetic crack repair, such as patching and painting, to deal with. Most importantly, structural damage is resolved, and the future of the house is sound – to the relief of the homeowner.

Individual houses, terraced houses and apartment buildings alike can suffer from settlement. Settlement of a floor slab or foundations, supporting the walls or structure of the building, often causes cracking in the brickwork walls.

Mainmark complete foundation and house lifting by using our non-invasive underpinning solutions. By injecting one of our structural resins into the ground under the building’s footings for foundation repair, we can stabilise the ground under foundations and lift the structure back to level, normally closing any cracks in internal walls of house that may have formed.

As opposed to more traditional methods of underpinning buildings, our Teretek resin injection solution is quicker and in most cases done from the outside using 16mm diameter tubes and if interior injection is required, only a 6mm tube is used. The size of the tubes means that there is minimal intrusion into the property.

Another of our non-invasive crack repair methods is JOG Computer–Controlled Grouting which allows our team to inject a property with a cement grout at as many as 128 points to make create a simultaneous, precise re-levelling process.

Benefits of Mainmark’s methods:

  • Crack fix – wall cracks generally close up
  • Jammed doors and windows free-up
  • Mess is kept to a minimum – no concrete dust or water to clean up.
  • Our non-invasive procedures mean there is minimal disruption to the homeowner
  • No further damage done to the property or landscaping
  • In most cases, residents can stay in the home and may not even need to move furniture
  • Many simple, residential jobs are done in a day
  • The methods we use strengthen weak ground, so your home becomes level, crack-free, and more stable
  • The products and techniques we use are environmentally inert.

 Our methods used on homes:

Mainmark’s new engineered resin injection solution

With over 20 years’ experience, Mainmark has led the world offering some of the most advanced resin injection and grout solutions.

Teretek from Mainmark is a new proprietary solution that utilises an injection delivery method developed to raise, re-level, and re-support buildings and other above-ground structures.

Advanced and Proven Technology for Re-levelling Large and Complex Structures

JOG Computer-Controlled Grouting is an award-winning grouting technology for strengthening weak ground beneath larger homes and structures such as residential buildings, using a cement grout injected under computer control.

It is an extremely precise method for stabilising soils, consolidating weak ground and lifting foundations to deliver specific, engineered outcomes, regardless of complexity.





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