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When to Restump and What to Look For

Restumping is a precise process and one that should not be subject to cutting corners or taking shortcuts. Stumps are a significant part of a building's foundation that you'll want to have last a long time. If you're thinking that your house may need restumping, here are some signs you may be right.

Sinking Stumps

Over time, the soil around stumps tends to expand and retract due to water, soil moisture levels, and decaying stumps just to name a few. Considering the soil under the house is mostly protected from the weather, it’s moisture level tends to remain stable. Exterior stumps on the other hand take the brunt of whatever mother nature throws at them which may result in rising or sinking of stumps.

The first signs of sinking stumps are sloping floors, cracks in interior and exterior walls and doors and windows not operating as they should. Poorly directed rain run-off and drainage, leaking plumbing, termites, poorly installed stumps and wear and tear can all contribute to the sinking of stumps. Over time, these problems compound and can set a chain reaction and may cause excessive damage inside and outside the house.

Not Using Steel Stumps

Steel is by far the most versatile product whilst restumping, superior to concrete and timber. Steel stumps also have the ability to support steel beams securely and often used in renovations. This is also particularly important when renovating bathrooms and kitchens that use traditionally more heavy materials such as marble, stone bench tops, island benches and heavy bathtubs.

No History of Professional Inspections

It is important to inspect house stumps on a regular basis in order to prevent the problem becoming much larger and more costly in the long run.

While it can be tempting to replace stumps on a stump by stump basis, it is highly recommended to employ a professional restumping company to inspect your dwelling to produce a report on an appropriate plan to stabilise the dwelling foundations.

Not Understanding Site Grading

This is an important factor in what depth the foundations of your home require. Understanding this is a major factor in the restumping process and another good reason to always involve a professional.

  • Class A: Mostly sand and rock sits with little or no ground movement expected

  • Class S: Slightly reactive clay site and slight ground movement

  • Class M: Moderately reactive clay or silt sites experiencing moderate ground movement

  • Class H: Highly reactive clay

  • Class E: An extremely reactive clay

  • Class P: A problem site may include soft soils varying in depths of fill, landslipes and collapsing soils

Soil types M, H and E may also have an added classification of D this indicates deep seasonal moisture variation which can mean significant expansion and contraction.

  • Class M-D may move up to 40mm

  • Class H-D may move between 40 & 70mm

  • Class E-D can move more than 70mm (up to 250mm has been found in some cases)

Bohm Industries is able to do site visits to determine whether your dwelling is subjected to a heritage overlay and can also organise a site soil report should you require one.


If you have noticed signs of your property having foundation issues, contact Bohm Industries to organise a visit to your property to quote on your restumping requirements and recommend a plan for rectifying those issues.


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