Fastwarm boards are manufactured from extruded polystyrene (XPS), we have branded our range of floor grade extruded polystyrene boards as EkoBOARDs, see
Underfloor Heating | Floor Insulation | Uheat &
www.ekoboard.co.uk
Please be careful with this type of floor insulation, make sure your supplier is selling floor grade XPS. Also we recommend these for concrete base floors but if your on timber then a tile backerboard is normally a better solution (more rigid). If you need info on backerboards please see
www.backerboard.co.uk
If anyone needs any further help, please don't hesitate to contact me.
Regards,
Peter