BLM Ancillary Products


Roofbase merchants stock a wide variety of BLM ancillary products including their patination oil, lead pointing sealant, standard lead slate, quickslates, unislates and aluminium soakers.

We also supply a variety of items for both decorative and utilitarian purposes from wood rolls and expansion joints to hall hooks and copper nails and much more…

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Product Details

Rolled Lead Sheet provides a lasting protection for a wide range of roofing applications. It is the professional’s choice for flashings, valley gutters, porches and dormers on residential property and can be the focal point for both traditional and contemporary buildings. However, not all Lead Sheet in the UK is manufactured to the same specification.

BS EN 12588 guarantees:

  • A range of standard thicknesses with a tolerance of +/- 5%;
  • The alloy used conforms to quality of not less than 99.81% Lead;
  • Improved durability

Lead is produced to six standard Code thicknesses, The Code numbers were derived from the imperial weight of a piece of the Lead measuring 1 square foot. For example, Code 3 weighed 3lb per square foot. With the introduction of the British Standard, the emphasis changed to the thickness rather than its weight per area.

Patination Oil is a white spirit based surface treatment that prevents Lead carbonate from forming on the surface of Lead Sheet and ultimately helps prevent staining to adjacent materials.

Patination Oil should be used on Lead roofing, flashings and cladding to give a uniform, attractive appearance where the Lead is visible. It is also necessary when water flowing from the Lead Sheet surface may come into contact with other visible building materials.

  • Prevents the white carbonate that forms on newly fitted Lead from staining adjacent materials
  • Provides a uniform, attractive appearance to new Leadwork
  • Easy to apply
  • Apply with a clean soft cloth immediately after fixing and before the Lead gets wet
  • Work horizontally or vertically in straight lines
  • The leading edge and underside of the sheet should be coated to a depth of 75mm
  • Patination Oil should be applied with care when the Lead is near UPVC and bitumen
  • Apply in a well-ventilated area, away from naked flames
  • Suitable gloves should be worn

BLM Lead Pointing Sealant is specifically designed for pointing joints between Lead and
masonry or brickwork; a low modular, non-corrosive, neutral cure silicone sealant which
can be applied easily using a mastic gun.

The most common reason for water penetration at an abutment is failure of the mortar used in pointing the joint between the Lead and brickwork or masonry. This is due to the inability of the mortar to expand and contract at the same rate as the Lead during temperature changes. In extreme cases, the pointing will crack and allow water to penetrate the joint and subsequently cause dampness within the building fabric.

  • Ensure the joint is dry and free from debris and dust before applying
  • The nozzle on the sealant tube can be cut to suit the width of the joint to be filled
  • Minimum depth of sealant not less than 25mm
  • For chase heights of 6mm – 18mm use BLM Hall Clips to secure the Lead flashings in place
  • For chase heights over 18mm use Hall Clip Plus or turn up the Lead flashing at the back of the chase and screw to the wall using stainless steel screws
  • Flashing lengths should not exceed 1.5 metres
  • Ensures long-term protection against water penetration
  • Coloured grey to blend in with the Lead work
  • Unique formula allows the Lead to expand and contract without cracking
  • Fast and easy to apply
  • Average tack free time is approximately 30 minutes

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.

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

When Lead flashings are installed, they are secured in place into the chase of the brickwork or masonry. The traditional method for fixing flashings is to use Lead wedges. However, this method can result in a loose fixing. Hall Clips are an effective alternative to wedges.

They are high tensile ‘v’ shaped stainless steel clips, designed by a roofing contractor to save time and provide a more secure fixing. They hold the Lead flashings in position so that they can be dressed down in to place. Standard Hall Clips should be used when fixing flashings in a 6-18mm chase. Hall Clips Plus can be used for chase heights of 18-26mm.

  • Gives a professional finish to linear and step flashing
  • Provides a secure fixing
  • Convenient and easy to use
  • Improves installation time
  • Helps prevent theft
  • Hall Clips should be inserted with ‘H’ uppermost
  • Easily secured with screwdriver or similar tool
  • Flashing lengths should not exceed 1.5 metres
  • Use in combination with BLM Lead Pointing Sealant for a clean finish

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.

Uni Slate

BLM Unislates provide complete weatherproofing where flue pipes and soil stacks penetrate a slate or profiled roof tile.


Aluminium soakers are inserted between successive slate or tile courses and protected by a cover flashing to make a waterproof joint.

Building paper

BLM Grade A1F Building Paper is a traditional, reinforced bitumen-bonded building paper laminate, manufactured with wet-strength Kraft paper, meeting the technical requirements of BS 1521 Class A.

Standard underlay

BLM Standard Underlay is a non-woven, crimped filament poIyester, needle punched to allow air to circulate freely between the underside of the Lead Sheet and timber board decking with penny-air gaps, preventing condensation forming and corroding the underside of the Lead Sheet.

Wood roll

BLM Wood Roll is used to provide an aesthetically pleasing expansion joint between two separate sheets of Lead.

Lead T-Pren Expansion Points

BLM Lead T-Pren provides a quick and cost effective solution to this problem where its use as an expansion joint allows the Lead to be laid along the slope of the gutter.

Permastrip and Copper Strip

The BLM product range includes a range of fixings designed for use with Lead Sheet.

Copper Nails

BLM Copper Nails are 25mm annular ring shank copper clout nails.

Lead dot sets

Several types of intermediate fixings are available for Lead Sheet applications but none are more decorative than Lead Dot Sets.


Hallhook is a permanent, secret and fail safe device that is used when replacing a broken slate.

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