Licensed foundation specialist Bevan Craig
Thermathene Orange 300 micron Damp Proof Membrane (DPM) or Supercourse 500 Synthetic Damp Proof Course SPC100030 (1000mm x 30m) under roadbase and 250 micron over to create dry space for roadbase to improve R value to R2. EPS on top of top membrane to prevent fastener punctures.
The 500G polythene membrane performs as a separating layer rather than keeping moisture out, whereas the 1200G (and above) membranes ensure that no moisture is made available to the screed and floor coverings. speed-screed.com in the UK use screed to cover underfloor heating piping. NOTE: “Concrete of other rigid sub-base” i.e. Roadbase with polystyrene on top. The screed is merely to level over the piping – it is not structural. British Standard BS8204-1:2003
youtube.com/watch?v=NbC-EfQ_u3E
Matt Reisinger – Montana
