Ancillaries for Lead
Metal Processors are suppliers of Patination Oil, Lead Sheet Sealant, Underlay, Copper & Stainless Steel Nails, Fixing Strips, Wood Core Roll and Borra Fixing Clips.
Specifically developed for the industry on behalf of the Lead Sheet Association, minimises unsightly staining and imparts a pleasing appearance to newly applied lead sheet and flashings.
Occasionally the patina formed on lead looks patchy and unattractive. In rainy or damp conditions new lead will quickly develop an uneven powdery white, non-adherent coating of lead carbonate, a corrosive product, which is aesthetically unacceptable. The staining of tiles and brickwork spoils the overall appearance of the building.
Patination oil will minimise this uncontrolled formation of carbonate, improve the hygiene on the job AND impart a pleasing appearance to the lead both ‘before’ and ‘after’ the formation of its final patina. Thermal Conductivity – 34.76W/m ºC
LEAD SHEET SEALANT
The practical, long-term alternative to mortar pointing.
This one-part, neutral-cure, high performance, silicon-based sealant has been specially formulated for use with lead sheet and flashings.
- The sealant is a specifically designed long term, flexible joint, which can absorb temperature changes.
- Avoids the problems of pointing with wet mortar, particularly in hot or frosty conditions.
- Quicker, cleaner and easier to use than mortar.
- The Lead Sheet Association recommends sealant.
For roofing, cladding and weathering applications, an underlay is normally used to isolate the lead sheet from the substrate and allow the lead sheet to expand and contract freely with changes in temperature.
To increase the life and performance of the lead sheet it is normally advisable to use an underlay in most applications. Needle punched non-woven geotextile polyester felts are found to be particularly useful on existing traditional timber boards to prevent ridges and fractures forming on the lead sheet where the lead rides over the edges of the boards.
It does not rot or cause adhesion and can in suitable conditions expose the underside of the lead sheet to a certain amount of air that contains the necessary ingredients for the formation of a stable patina.
STAINLESS STEEL NAILS
Nails should be large-headed copper or stainless steel conforming to BS1020-1&2.
- The shanks should be annular ring, helical ring or serrated and not less than 20mm long.
- The shank diameter for heavy duty should not be less than 3.35mm and for light duty not less than 2.65mm.
Clips will hold lead permanently in position. Cut to the required length fixing clips are recommended in rolls, welts, standing seams and for the clipping of lap joints and flashings.
Clips should not be less than 50mm wide. They should be turned over at the edge of the lead by at least 25mm except where they are tucked into a welted edge.
Continuous clips should not be less than 75mm wide. Available in copper and stainless steel.
WOOD CORE ROLL
Used for joining bays of lead roofing, also on steeply pitched roofs and lead cladding where a bold joint appearance is preferred, allowing for the expansion and contraction in lead sheet and flashing.
The wood rolls are treated and shaped as shown. The undercut to the base of the roll is designed to prevent wind lift.
Sizes available: 2.4mtr x 50mm & 2.4mtr x 75mm
BORRA FIXING CLIP
An easy-to-use fixing clip which will securely fasten lead flashing in place