Remedial Work

What we do ?

A full removal provides complete assurance of future stability and caters for any uncertainty as to the sulfate attack mechanism that may remain after site investigation. Our recommended procedure is:

• Remove the concrete floor slab.
• Excavate all the sulfate-bearing fill material.
• Backfill with an inert material that is free from significant amounts of sulfate, sulfide and other deleterious substances to a level that allows for installation of a sand blinding and layer of insulation.
• Place and compact in layers following usual good practice.
• Lay the sand blinding and cover with overlapped and sealed sheets of 300 micron polythene DPM. Ensure by good detailing and workmanship that this DPM is not subsequently punctured.
• Install a layer of insulation such that the U-value of the floor is 0.25 W/m2 or better.
• Construct a new concrete floor slab over the DPM, specified only to meet usual Building Regulations.

Materials Used

• Fill material - Type 1 stone compacted and blind with sand.
• 1200 gage damp proof membrane.
• 125 mml Polystyrene insulation sheets.
• Class 3 concrete (35N)