underpinning

Basement Underpinning Specialists

Underpinning Specialists

At PMC Foundations Ltd we provide the complete basement box ready for fit out. Including underpinning, removal of surplus, drainage and concrete slab. Also we carry out general underpinning, excavations and foundations, commercial & domestic. We are a family run business who specialises in;

  • Basements Underpinning
  • Domestic Underpinning
  • Commercial Underpinning
  • Mass Concrete Underpinning
  • Beam and Base Underpinning
  • Footings & Foundations
  • General Excavations
  • Rafts
  • Anchor Blocks
  • Concrete Slabs
  • Trench Sheeting

Our team our fully trained and professional whilst adhering to todays health and standards. We have undertaken many underpinning projects over the years including basement underpinning, please view our gallery to see the work we do.

Many types of underpinning involves digging holes underneath buildings within confined spaces. Cracks appear on building walls caused by subsidence which can lead to horizontal stretching or squeezing of the ground causing vertical movement.

When movement of a building occurs, underpinning may be a solution. This will require digging underneath shallow footings and pouring concrete to extend the reach of the foundations to become stable.

Movement after construction

Many things can disturb the balance between the ground and its structure to create new settlement. Deep excavations, buildings on old foundations for example, can create new movements in all types of ground.

If ground movement is anticipated, structural damage can be mitigated by installing temporary measures such as bracing door and window openings.

 

Traditional Underpinning

This method is suitable for all types of buildings and is the more preferred method, as a simple support structure is created underneath the foundations enabling stability. This involves the removal of earth and replacing it with poured concrete carried out in 1 metre sections commonly known as underpins.

Base & Beam

This is used regularly as it has proven to be more cost effective, requiring less earth being excavated and less mass concrete poured. Fewer blocks are inserted than the traditional method as a beam is installed above the blocks creating further support. It can be used on most buildings although it may depend on the type of ground requiring work.

Anchor Blocks

This requires the excavation of earth 3 to 4 metres away from the cracked wall and installing concrete in the form of anchor blocks. Raking shores are then fixed to support the cracked wall.

Rafts

This is used where ground is made (filled in with imported earth) or where ground is inadequate for traditional foundations. Piles are driven through the made ground to the original solid earth. A reinforced concrete slab otherwise known as a raft is installed throughout the whole floor area of the building and under all low bearing walls , therefore supporting the entire structure.

Trench Sheeting

Trench sheets are purpose made steel that come in lengths of 1-5 or 6 metres as necessary and can be braced with steel or timber props to keep earth banks apart. This method is used to support loose ground and act as earth work support for health and safety purposes.

If your looking for underpinning services in London please call our specialist underpinning team here at basement underpinning.co.uk. Call the underpinning contractors in london on (020) 7639 7642 or simply complete the contact form on our website for a fast quotation.

Go to top