Lead Underlay

Lead underlay is the name given to a roll of material that is fitted before installing lead roofing. If you’re working with smooth substrates, such as plywood, concrete or natural stone, building paper can be used. This prevents alkali from being released and attacking lead sheeting. 

If you’re working in a moisture-prone environment, consider opting for a moisture-resistant underlay as this will prevent moisture from affecting the lead roofing. You’ll find there are many benefits of installing lead underlay; not only does it provide you with a smooth and even surface to work on, but it also ensures there are no rough edges and protects the lead against corrosion from stone or concrete.

Additionally, lead underlay creates a barrier between the lead sheet and the substrate, meaning that thermal movement can occur without causing major issues or lead dragging. 

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