Simpson Strong Tie Twist Strap 1200 x 30 x 2.5mm Light Restraint Strap H and L straps are designed to the Building Regulations , BS 5268 Part 3 and other building standards for vertical and horizontal restraint when connecting timber floor and roof systems to masonry walls.) HRS and LRS new rolled form gives strong performance, yet light to use. The HRS is accepted by NHBC as an alternative to the 30mm x 5mm restraint strapping. The LRS is an alternative to the 30mm x 2.5mm restraint strap. HTFA and LTFA are designed to bridge the 50mm cavity and tie the timber frame to brickwork. Extends 75mm into brickwork and 300mm through cavity. Heavy restraint straps meet requirements for lateral restraint of roof trusses, rafters and joists tied into masonry walls. Light restraint straps are designed for vertical loads such as wall plates on top of masonry walls. All common sizes in stock from 500 to 2000mm long, 100mm increments. Use all specified fasteners. See General Notes. The flat face of