Your foundation is the most structure of a new or renovated home. A poorly constructed foundation may be the result of inadequate underpinning.
Historically, concrete underpinning or timber stumps have been the mainstay of a home’s foundation. these days, that list can be expanded to include resin injection.
Knowing a little bit more about what restumping does and what it can achieve can help you to choose the right underpinning expert and make an informed decision when you’re looking for pricing.
Why is Underpinning or Restumping Necessary?
Your home’s underpinning can become unstable or inadequate for a number of reasons. These are the original foundation has simply decayed over time. Or, it may be that your foundation has some significant fault due to structural damage.
Added weight, due to renovation, natural disaster, nearby construction work or soil subsidence can be other factors that require strengthening or additional stumping of your home.
The nature of the problem and the cause of the fault may indicate the best underpinning solution for your home.
For example, if the foundation has been weakened through subsidence then resin injection may be the ideal solution. If the damage is caused by renovation or nearby construction then concrete reinforcement or engaging a restumping service maybe what is needed.
When is Restumping Necessary?
Underpinning may become necessary When you construction nearby is taking place or where there is settling of an existing home or building.
It may also be needed where the structure is used for different purposes or when a basement is added. Underpinning may be an issue where you begin to see cracks in wall or floor tiles or along window and door frames. Doors that jam, as well as cracks in the slab or walls, may also be indicators.
First home buyers need to add underpinning and soil test in their checklist.
Wall or cement slab cracks larger than a quarter of an inch are probably a signal that it is time to call in a building engineer to assess the problem.
Once you have correctly assessed the problem you can then decide on which method of underpinning to use.
Concrete and Resin Injection Underpinning
The purpose of concrete underpinning is to strengthen the foundation by increasing the mass and load-bearing ability of the floor.
In the case of mass underpinning excavation around or under the existing foundation is achieved by pouring concrete into increase the foundations overall mass.
These concrete pillars are like nails that are sunk deep into the ground. The existing foundation is attached to these pillars of cement in order to reinforce it.
Resin injection is an alternative and more basic methods that can be used in reactive soils.
The benefit of resin injection is that little, or no excavation is needed because the resin can be injected straight into holes board into the soil around the existing foundation.
As the resin begins to dry it expands. This expansion binds the soil and causes the soil to be less reactive. It will also fill any gaps that exist around the foundation.
Which Method is Best for You?
Concrete underpinning takes time and involves a fair amount of excavation. But, depending on the conditions of your home it may be the best option. It is typically more cost-effective, particularly for smaller jobs.
Underpinning using resin injection is usually quicker, but it can end up costing you more. You can only really estimate the number of gaps that will need feeling under the soil. Resin you use the more expensive the job will be.
Of course, the most important thing is that you at the engineer be confident that whatever problems occur in your foundation and underpinning are being solved correctly.
When comparing quotes for underpinning, don’t just look at the price. Also, consider the workmanship and history of the engineer or builder you are getting to do the job.