Roof maintenance of historic building in Cape Town

Case study

Repair of the corrugated iron roof of the historic FNB building in Adderley Street, Cape Town. This building was the last building designed by Sir Herbert Baker in South Africa.

FNB appointed Vestocorp (Pty) Ltd as contractor for a large renovation project to the FNB Adderley Street. As this is a heritage building special care needs to be taken and rules adhered to. The project included the repair of the existing corrugated iron roof consisting of approximately 400 sqm. As the contractor had made use of BULLDOGSEAL on other similar projects in the past, they ordered grey coloured BULLDOGSEAL to use on this roof.

BULLDOGSEAL simultaneously seals and provides the final finish as no over coating is required. The binder in BULLDOGSEAL is a highly flexable acrylic compound that has been proven for its weather and water resistance for up to 10 years.

There were 5 main areas where  BULLDOGSEAL Waterproofing was used.

  1. Roof screws – BULLDOGSEAL was used to cover and seal the roof screws.
  2. Roof sheeting overlaps
  3. Ridges
  4. Box gutter currently sealed with Bitumen torch on sheeting that was damaged in some areas. BULLDOGSEAL can be used in conjunction with older Bitumen torch on sheeting where you may find cracks or the sheeting has torn or pulled away from the concrete.
  5. Flashings

The roof was first thoroughly cleaned and all visible damages repaired.

Contractor then pained on the primer : BULLDOGSEAL diluted with water – 50/50.

Once dry, this was followed by 2 coats of full strength BULLDOGSEAL, painted on using a paintbrush.