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Town Hall Lead Refurbishment

Dukinfield Town Hall Slate Roof

K-Roofing contractors refurbishment work on Dukinfield Town Hall slate roof.

The contract included replacement of leadwork on the roof, abutments, tower(s) and reslating and stepped flashings to the bay windows.

Lead metreage statistics:

• 180m lead gullys
• 145m lead flashings and capping pieces
• 85m lead valleys
• 25m inverted fishtail soakers
• 85m soakers

Main Slate Roof Areas

• Overall, the large main areas of the Town Hall were deemed to be in good condition and the general slating was in good order

Bay Windows

• Carefully striping back the existing roof slates
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Public sector slate roofing
• Inspecting and reslating the roofs
• Releading the flashings on abutments in code 4 lead flashings
• Each flashing was mechanically plugged twice and mechanically sealed using flexible lead seal

Roof Gullys, Abutments, Soakers and Flashings

• All of the roof lead required renewal and ensuring it met Lead Development Agency (LDA) Regulations
• Access to the gullys was gained at the bottom of the slated roof areas where the first 3 courses of slating were mechanically removed from eaves upwards
• All the defective lead gully materials were removed and disposed of
• A report on existing timbers was provided to main contractor, and remedial work and repairs was carried out by them
• All defective leadwork was then renewed according to LDA Regulations
• Fully welded expansion joints were installed to allow thermal movement caused by solar radiation
• The roof valleys were renewed in code 5 lead
  • Where dual roof pitches meet it creates a valley where rainwater run-off is channeled into the gutters
  • The lead valleys installed are created using lead sections no longer than 1.5 metres. This length allows for thermal expansion and contraction of the metal and prevents loosening or splitting of the lead
  • The lead sections were fixed using copper nails to prevent corrosion or chemical reaction. The first valley piece is fixed at the valley bottom and nailed at the top. Subsequent sections overlap the underlying one by 150mm to prevent water ingress
• Against all wall abutments all courses of slate were removed 3 courses in from the abutment to gain effective access to lead soakers
• New replacement soakers were cut to size and installed whilst the slates were being reinstated
• The first 3 courses of slate material above gullys was reinstated
• Reclaimed Welsh slates were sourced to match existing to compensate for any breakages
• All stepped and lead flashings were renewed in code 4 lead

Roof Spire and Tower

• The spire and flag pole was reslated and given new lead flashings
• The roof tower on the rear roof section of the building was stripped of courses of slates and its defective lead paneling and soakers
• New vertical wooden mop roll joints were installed
• Lead soakers and aprons were installed at the base of the tower as reslating progressed
• New code 5 lead panels were cut to size, dressed to suit the mop roll joints, copper nailed at the top and clipped with Turn Coated Steel clips at the base to allow thermal movement