NBS Source
Newton Fibran XPS 500-C


Can be used in the following areas:

  • As the spacer below Newton System 500 flooring membranes;
  • Protection of externally applied Type A waterproofing;
  • Insulated support below Newton 403 HydroBond waterproofing membrane;
  • Parking decks and green roofs;
  • Insulating of subterranean structures sited permanently within the water table


A 50 mm deep, closed-cell thermal insulation board made from rigid extruded polystyrene foam (XPS). The product is manufactured in accordance with EN 13164.

Newton Fibran XPS 500-C boards are used to form a 50 mm insulated spacer adjacent to the Basedrain and Floordrain drainage channels within the Newton System 500 cavity drain waterproofing system, where it remains dimensionally stable even when fully immersed.

The insulation boards have a heat hardened surface to increase point load capability below studded membranes and feature specifically designed slots to the underside of the boards, that in combination with the perimeter and spine drainage channels of Newton System 500 form a fully drained supporting spacer below the floor drainage membrane.

The insulation boards can also be used as a protection for Newton System 100 liquid applied waterproofing membranes applied externally to new earth retained structures or retained walls, providing protection, insulation and drainage within one product.

Features and benefits:

  • Third-party tested to confirm the load capability for use below Newton studded, cavity drain membranes.
  • Excellent thermal insulation characteristics, with a very low coefficient of thermal conductivity.
  • Closed cell structure with no connecting capillaries resulting in high resistance to water absorption and diffusion of water vapour.
  • Capable of permanent submersion in water.
  • Fully inert when subjected to climatic variations.
  • High mechanical and compressive strength and high dimensional stability.
  • Does not contain CFCs, HCFCs, PBDEs, PFOA or PFCs.
  • Easy to transport, cut and apply.
  • 100% recyclable.
  • Completely rot proof and does not develop any mould or other efflorescence.
  • No nutritional value for rodents, insects, etc.
  • Good resistance to acids, alkalines, aggressive ground containments and inorganic gases.
  • Suitable substrates include compacted, clean, level surfaces, basement concrete floor slabs and rafts, earth retained walls of concrete, mortar or insulating concrete forms (ICF) and compacted blinding.
  • CE marked.
  • Life expectancy is equivalent to the building in which it is installed (estimated at 50 years).

General information




50 x 1000 x 600 mm

Uniclass 2015

Pr_25_71_63_29 Extruded polystyrene (XPS) boardsPrimary


J40/290 High density polyethylene/ polypropylene studded cavity drain membrane

J40/380 Protection boards for damp proofing/ tanking

J40/70 Protection boards for damp proofing/ tanking

Product range

Internal Cavity Drain Waterproofing

Specification data - Extruded polystyrene (XPS) boards Enhanced data

Product Reference

Newton Fibran XPS 500-C (500C)

Accessories/ Other requirements

Not required.

Newton Insulation Fixings (IF90).


Rigid board with a slotted surface and square edges.

Environmental information




Newton Fibran XPS 500-C

Newton Fibran XPS 500-C