Speedfit Pipe is now offered in both PEX and Polybutylene. It has an inner barrier to prevent the ingress of atmosphere, it is manufactured and kitemarked to British Standard BS7291: Parts 1, 2 & 3: Class S. It is lightweight and flexible, making it especially suitable for underfloor heating installations. For screed systems, the pipe is attached directly to insulation with staples, floor clips or mounting rails. Spreader Plates are available for timber flooring using either traditional joists or TJI joists .