STRINGERS
Stringers should be formed in roofing grade mastic asphalt and applied in two
coats to a thickness of 13mm, dressed into a continual 25mm x 25mm chase,
constructed either parallel to the pitch of the stairs or stepped vertically and
horizontally to follow the line of the treads and risers. Stringers over 300mm high to be applied in three coats to a thickness of 20mm.