EVERFLEX LEADMATE is a low modulus, neutral cure sealant specifically designed to give exceptional adhesion to soft metals such as lead, brass etc.  The product is specially formulated as an alternative to mortaring Lead Flashing and Sheet into Brick, Stone and Concrete. Conforms to BS5889 Type A.


Areas For Use

• As an alternative to mortaring in Lead flashing and sheet into brick, stone and concrete.
• Suitable as an expansion joint sealant.
• Weather sealing and joint sealing to pre-formed panels.
• Sealing soft metals such as lead, copper and zinc.
• Parapet and roof weather sealing applications.



* Do not use in conjunction with bitumen asphalt, neoprene and certain organic elastomers.
* Do not use on substrates that bleed oil, solvents or plasticisers.

Surface Preparation

The surfaces to be must be clean, dry and free from dust, grease and other contaminants. Priming is generally not required, although we always advise testing small areas prior to use.


Joint design should be as follows:

Minimum width: 6mm. Movement capacity will be impaired if the depth of the joint is greater than the width. For maximum movement accommodation, it is recommended that:


The  joint depth should be no less than 5mm


Joint depth should be 5mm for joints up to 10mm wide


Joints above 10mm in width should be half the width in depth up to 20mm and  minimum 10mm for wider joints


Maximum joint width without slumping is 40mm. When flashing into concrete walls with a wider joint, always fix the lead with stainless steel screws and plugs prior to applying the sealant.

All joints should be designed so that the seal is placed in a position which does not retain water or form a water trap.  Triangular fillets should be no less than 12mm across the face and should be finished with a flat or convex face.

Cut the tip of the cartridge taking care not to damage the thread. Apply nozzle and cut at an angle of 45o with an opening slightly larger than the gap to be sealed. Apply using a standard sealant gun. Best results will be obtained by keeping an even pressure on the trigger and keeping the gun at a constant angle to the surface being sealed. To ensure a proper bond, always smooth the sealant down with a spatula or piece of wood. An improved joint appearance can be achieved by placing masking tape to both sides of the joint, removing within 5 minutes of application.

We believe in using the best products available in today’s market to ensure every project lasts as long as possible. This is a product we believe in using in place of traditional cement pointing during lead work weather proofing. Cement often cracks during any movement in the roof or movement caused by winds etc. Lead Mate will flex with the building ensuring a weather proof seal for longer.

Leeds Roofing Company, the best Leeds Roofers offer free friendly advice and quotations on all roofing and property maintenance needs. Call us today for any help needed.

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