Understanding Underpinning

The Process

Site Inspection

A site inspection of the property is required to investigate the damage, determine the amount of piers required, the amount of access available for our machinery and to work out an approximate time line to complete the work. We like the owner to meet us on site during the site inspection to point out an explain to them what has caused this subsidence, what we can do to rectify the problem and to answer any question they may have.
Once the site inspection has been carried out a detailed quotation will be sent out explaining what is required and the cost involved. If the owner would like to go ahead with the quotation, they are required to sign the quotation where stated and post or fax it back to us. On receiving the signed quotation a contract will be sent out for their perusal and signing.

Underpinning Process

Firstly, our underpinning team will set out and prepare the property ready for the rectification works to commence. During this process concrete , doors, etc.. may need to be removed. Once the area is prepared, the holes for the piers will be drilled out with an Auger to the required depth determined by us and our engineer.
Each base of the pier is cleaned out so the base of the surface has good bearing. If the piers require reinforcing steel ( this is determined on the site inspection), it will be placed into position at this time. Then concrete is placed into the piers holes forming the headstock and piers at the same time.
The concrete will need approximately four (4) days to cure. Once the concrete is fully cured, our underpinning team will return to the site to attempt to jack the building back to the original level. After this procedure, the headstocks are capped and the footing will now be fully supported.