What's Involved in The Restoration:
External Stone and Concrete Cladding and concrete columns were cleaned using a DOFF cleaning system. A DOFF machine was placed on a drip tray with a spill nappy in a secure area at ground level.
Joints were primed with Sika Primer-3N. Correctly sized backing rod was used to achieve the required thickness of mastic relative to the joint. New mastic SikaHyflex 250 Façade was gunned into the joint and tool finished as required.
Cladding surface which requires removal was taken back 20mm using a breaker fitted with a sharp chisel. Where this was likely, hand tools were used. Areas repaired were pre-soaked and primed with Remmers Restoration Mortar Slurry. Repairs were carried out using Remmers Restoration Mortar in the chosen colour and finished flush to the original profile.
What Techniques Were Used When Restoring The Scottish Widows HQ:
All external Concrete Columns, repaired or not, received a treatment of Remmers Funcosil FC Impregnation Cream or a 2 coat clear treatment of Sikagard 740w . This was applied by brush and roller at a consumption rate of 0.25ltr per square metre.
Cracks to the knuckles and columns were resin injected. Injection ports were fitted to the crack at 200mm intervals. The crack surface was sealed with Sikadur 31 or similar. The crack was pressure injected by hand using a skeleton gun. The surface sealant was removed after curing.