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Standard Lead Slate

BLM Standard Lead Slates are used wherever a pipe penetrates a roof covering to provide a weathertight joint. They can be used on tiled, asphalt, felt and slate roofs.
Standard Lead Slates are manufactured using Code 4 Rolled Lead Sheet to provide the base and upstand. A range of standard outlet sizes and pitches are available from stock. Any diameter outlet, roof pitch and, for deep profiled tiles, larger base sizes with adequate weathering laps can be manufactured to order.
 
Standard Lead Slate
BLM Standard Lead Slates are used wherever a pipe penetrates a roof covering to provide a weathertight joint. They can be used on tiled, asphalt, felt and slate roofs.
  • Standard slates suit roof pitches of 30-40 degrees and 90 degree angles for flat roofs and vertical outlets
  • Outlets to suit 75mm, 100mm, 125mm and 150mm outside pipe diameters
  • Provides weathertight joint
  • Saves welding
  • No maintenance required
  • Lasts a lifetime
  • Ensure in all cases that slates/tiles are fitted closely to the soil pipe
  • A welt should be formed on the upper edge of the base before the tiles are fitted to prevent any driven rain penetrating the roof structure
  • For plastic pipes, a standard plastic collar should be solvent cemented to the top of the pipe to provide a watertight weathering
  • For cast iron pipes, once in position, the top edge of the upstand should be dressed into the flue for weathering purposes
  • Apply Patination Oil to prevent unsightly white carbonate from staining adjacent materials
Dimensions and packaging:
  • Base size: 450mm x 450mm and min upstand height 150mm
  • Non-standard sizes can be supplied to special order to suit different outlet diameters, upstands, roof pitches and base sizes

Standard Lead Slate ‘How To’ Video Transcription

Below is a transcription of a video shot by BLM with Tim Fuge, Young Leadworker of the Year 2016, on the correct way to install Standard Lead Slates.
Tim Fuge:
Hi, my name is Tim Fuge and we're here at the LSTA Training Centre in Kent to bring you the latest BLM guide to installing Standard Lead Slate.

Why Install Standard Lead Slates on a Roof

Tim Fuge:
BLM Standard Lead Slates provide a weather tight joint where a pipe penetrates a roof structure. They can be used on tile, slate, felt, and asphalt roof coverings. For preparation, we firstly need to find the pitch of the roof to ensure we are using the correct slate.

Tim Fuge:
In this example, our pitch is 34 degrees. Our pipe has an outside diameter of 110 mm. BLM Standard Lead Slates are made from British Standard Code 4 Lead to BS EN 12588. With a 450 mm square base, a minimum upstand of 150 mm, and an outside diameter of 75 mm, 100 mm, 125 mm, and 150 mm or 3", 4", 5", and 6" outlets. In pitches of 30 to 40 degrees for pitched roofs, and a 90 degree angle for flat roofs. Non-standard slates can be made to your exact specification. Today we're installing a 4" pitched Lead Slate. At this point, a good tip is to apply one of BLM's surface treatments to the reverse side of the Lead Slate to prevent white carbonate run off onto adjacent materials. Shake the container and apply with a clean, soft cloth and allow to dry. This avoids having to turn up the Lead later to apply the treatment.

How to Install Standard Lead Slate to Lead Roof

Tim Fuge:
A welted check edge should be detailed along the top edge of the slate base to prevent any driven rain bypassing the top of the slate in storm conditions. The Lead Slate is then placed over the pipe and in position. Apply BLM Patination Oil or Lead-Coat with a clean, soft cloth to the surface, leading edges, and if you didn't pre-oil the reverse side prior to installation, the underside of the slate to a depth of 75 mm. This gives the lead a consistent dark grey appearance and prevents staining.

Tim Fuge:
Roof tiles should be fitted as close to the pipe as possible. Plastic collars can be secured using solvent cement and finished off with a vent cowl. If you require further information, then please visit britishlead.co.uk or leadsheet.co.uk. Thanks for watching. And don't forget to check out more videos from BLM on YouTube or via the free BLM app available to download from your app store.
To learn more best practices when it comes to leadwork use the links below to download the BLM app

  Get it on Google Play

A Product Data Sheet providing advice on its use can be found on the download below

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