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In this video we mix 3 parts sand, one part cement and some reinforcing fibre in order to make some reinforced mortar to repoint a lead roof valley. This mortar is mixed with SBR instead f water, which helps to make the mortar more flexible and waterproof. Links to the fibre and SBR can be found here-
fave.co/1OR8GUl
fave.co/1KUOMEb