Service: FLOW-xS Screed Joists Underfloor Heating This project was for a new build site in Addlestone, Surrey using Flow XS liquid screed. First Floor Specification – 25mm PIR insulation Slip membrane 16mm Wet underfloor heating pipes clipped onto the insulation 45mm Flow Xs Bathroom floors where tiled after light sanding and the use of Anhyfix tile adhesive. Project Gallery Ready to start your project? Contact us today for a free quote or technical advice. Get a Quote