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BLM Quickslates provide a simple but effective weatherproofing solution where a pipe penetrates a roof covering.
They consist of a rubber cone vulcanized on to a Lead slate base, manufactured from Code 4 Rolled Lead Sheet. The malleability of the Lead base means that unlike similar products that employ aluminium or hard metal bases, BLM Quickslates can be easily shaped or dressed to suit almost any roof profile.
BLM Quickslates can be easily shaped or dressed to suit almost any roof profile.
They are used where flue pipes and soil stacks penetrate slate, tile, felt and asphalt covered roofs. Quickslates are also suitable for gas flues, withstanding temperatures of 150°C. Available to suit flat roofs with vertical outlets and 30º - 40º pitched roofs. Quickslates suit most pipe diameters up to 125mm.
  • Provides a weathertight joint
  • Saves welding
  • Easier to fit than aluminium and zinc
  • No maintenance required
  • Cut the rubber to suit your pipe diameter
  • Always cut the aperture in the rubber slightly smaller than the required diameter to ensure a weathertight fit
  • Use a water based lubricant or silicone grease to lubricate the neck of the rubber sleeve of the Quickslate prior to fitting
  • Use Lead-Cote to prevent unsightly carbonate from staining adjacent materials
  • It is best not to use Patination Oil on Quickslates so to prevent damage to the rubber
  • Take care not cut outside of the outer ring or into the wall of the upstand
Dimensions and packaging:
  • Base dimensions: 450mm x 450mm and min upstand height 150mm
  • Pipe sizes: Can be cut to suit a range of outside pipe diameters up to 125mm

Quickslate ‘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 Quickslate.
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 Quickslates.

Why Use Quickslates on a Roof

Tim Fuge:
BLM Quickslates provide a simple but effective weatherproofing solution where a pipe penetrates a roof. They can be used on tile, slate, felt, and asphalt roof coverings. BLM Quickslates are made by vulcanizing a rubber cone onto a 450 mm square Code 4 Rolled Lead Sheet base. The flexibility of the rubber upstand means they suit pipes with diameters up to 5". Two pitch variances are available, 20 to 40 degrees for pitched roofs and 0 to 20 degrees for flat roofs. Quickslates are suitable for use with gas flues withstanding temperatures up to 150 degrees Celsius.

Tim Fuge:
For preparation, firstly we need to find the pitch of the roof to ensure we're using the correct slate. In this example, our pitch is 34 degrees. 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. At this point, a good tip is to apply BLM's Lead-Cote to the reverse side of the lead slate to prevent white carbonate run-off onto adjacent materials. Shake the container, spray onto a clean, soft cloth, apply it to the Lead, and allow it to dry. This avoids having to turn up the apron later to apply the treatment.

When to apply Quickslate to Lead Roof

Tim Fuge:
The rubber cone comes sealed providing users with the flexibility to cut an outlet to suit the pipe diameter. Handy rings give guidance to increasing outlet diameters up to a maximum of 125 mm or 5" at the outer ring. Careful cutting of the rubber cone is required. Ensure that no cuts are made outside the outer ring or in the wall of the upstander as this will cause the rubber to tear when stretched over the pipe. Use a water-based lubricant or silicone grease to lubricate the inside neck of the rubber upstand prior to sliding over the pipe. Never use washing-up liquid as this can cause the rubber to deteriorate.

Tim Fuge:
The Quickslate is then placed over the pipe and into position. Apply BLM Lead-Cote with a clean, soft cloth to the surface, leading edges, and if you didn't pre-coat the reverse side prior to installation, the underside of the slate to a depth of 75mm. This gives the Lead a consistent dark grey appearance and prevents staining. It is advisable to use Lead-Cote instead of Patination Oil to prevent damage to the rubber upstand. Roof tiles should be fitted as close to the pipe as possible. The vent cowl can be secured using solvent cement to finish off.

Tim Fuge:
If you require further information, then please visit or 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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