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Example of Slate Roofing & Dormer Cladding

Slate Roofing and Dormer Cladding

Slate roofing, dormer releading, renewal of timber fascia and soffits.

The roof to this house was at the end of its lifespan and required a complete reroof.

• The slate roof was defective with numerous broken, damaged and tarred slates and poorly seated ridge tiles
• The existing lead was of variable thickness and showed evidence of thermal movement caused by heating by the sun
• The timber fascias were rotten and unsound
• The dormer flat roof had defective decking

• The supply and erection of scaffolding for roof access and safety
• The existing roofing materials were stripped off and dispose of or stored ready for reuse, this included:
  • slates
  • wooden battons
  • lead flashings and valleys
  • ridge tiles
  • Velux windows

Slate Roof

• Reclaimed Welsh slates were acquired for the entire roof area to ensure minimum variation to colour/shade, grade, thickness and steps of slate.
• A waterproof breathable membrane, a secondary roofing system, was positioned over the structural timbers. The membrane forms a seal against any wind blown spray that might enter under the slates. It is the base layer of the roof covering
• The membrane was mechanically fixed to the structural timbers using 25x50mm wooden battons , positioned horizontally.
• The positioning of the battons was set specifically to take the courses of reclaimed Welsh slates
• Slates were raised onto the scaffold and fixed to the roof battons with the smaller slates towards the top of the roof to minimise roof loading
• Code 4 lead (a British Standards quality classification) was installed to all chimney flashings, incorporating flashings and aprons and to roof valleys

Velux Windows

• The existing skylight windows were found to be unsound and at the end of their reliable lifespan and so were replaced
• We fitted the replacement Velux windows using the new flashings

Ridge Tiles

• Replacement ridge tiles are high grade mechanically fixed versions designed for locations at risk of high wind speed and turbulence
• The Redland Smooth Uni-Angle dry fix system was installed on all hips and ridges
• Roof slates were cut to the appropriate angle to suit the roof hip
• The adhesive membrane which forms a seal and ads structural integrity to the ridge was supplied and fitted
• The dry fix system ridges were then laid in position and mechanically fixed to the hip rafter

Timberwork

• The timber fascias of the hip apex were renewed and mechanically fixed

Dormer Lead Cladding

• All existing defective (variable thickness, evidence of thermal movement) lead cladding was stripped and removed from site
• New Code 5 lead was used to clad the dormer cheeks and weather seal them
• LDA regulations were adhered to for cladding, welt joints and flashings to ensure a weather proof seal and minimise thermal movement

Dormer Flat Roof

• The defective dormer flat roof required recovering, involving the removal of the existing defective roof covering, decking and timber fascias
• Firring pieces (3" down to 0") were installed and mechanically fixed in place to provide the falls on the roof.
• A replacement timber deck of 18mm WBP (Weather and Boil Proof) plywood decking was installed
• Installation of 50mm x 50mm tilt fillets (3 edged raised upstands) was carried out to channel the water towards the front gutter
• The built up felt 2 layer torch on system was installed to specification. The specification is based on the balance of the merits of each proposal: the roof type and usage, local environmental factors; lifetime requirements; and the cost that best suits a particular budget
• Green mineral felt drips were supplied and installed to the perimeter
• New guttering and rainwater goods with seamless aluminium profile were installed
• uPVC fascias were installed for long life and easy maintenance.