Stone will deteriorate by acid attack:
– Therefore it is essential that all stone work is regularly maintained and expertly decorated paying particular attention to prevent damp penetration.
Additionally, some stone work, for example door surrounds, are attached by ferrous ties which can rust. If the gap between the stone work and the wall is not adequately weathered damp will penetrate between the wall and stone work; this can freeze during winter and create a ratcheting effect which can result in the heavy stone work becoming detached and falling.
This risk can be aesthetically and sympathetically negated by the use of lead.
Party Wall Surveyor serving Thanet and London
Third Surveyor serving England and Wales