Wet Area Flooring

Solve your wet area under flooring problems with Supaboard

At Poly-Tek we are manufacturers and suppliers of quality building products suitable for domestic, commercial, and industrial applications. All our products meet strict Australian standards for safety and durability.

For wet area under flooring, we supply a product called Supaboard flooring system. Built to be rigid and extremely tough, Supaboard has some unique features such as tongue and groove which makes it practical and easy to install, while offering maximum versatility.

Supaboard flooring system is a great choice for using under suspended floors, sub-floors, and areas where moisture resistance is required.
This makes Supaboard ideal for:

  • Shops and retail outlets
  • Offices
  • Transportables
  • Kit homes
  • Renovations and home improvements

If you’re looking for a cost-effective wet area under flooring solution for your next build project, you’ll find Supaboard a great alternative to similar products available. Our product Supaboard has superior sustainability credentials.


The standard thickness for Supaboard sub-flooring is 15mm and 18mm. Both thicknesses comply with loading code AS1170.1, 15mm on 450 joist spacing or18mm on 600mm or 450mm joist spacing.
Other thicknesses from 20mm up to 25mm are available on request.

Joist types

Steel or timber. To allow for the most efficient fixing of the floorboards we recommend that the thickness of the joists and trimmers when used is not less than 45mm.


900mm (W) x 1200mm (L)
900mm (W) x 2400mm (L)
900mm (W) x 2700mm (L) on request

Special orders

On request, Supaboard Flooring can be ordered to specific sizes, with a maximum length of 3000mm.

Here’s what’s special about our wet area underflooring

  • No special treatments required for termite resistance
  • Recyclable and Low Embodied Energy
  • Asbestos Free & Non-Toxic
  • Weather resistant and durable
  • No special requirements for on-going maintenance
  • Moisture Resistant
  • Can be used as a substrate in wet areas
  • Non-combustible material and complies with AS1530.1
  • Complies with the Australian Loading Code AS 1170.1
  • 25% lighter than compressed cement sheeting
  • Economical
  • BAL – 40 Zones (Bush fire attack level)

Find out how we can help you with you next building project by calling our friendly Brisbane team Monday to Friday from 8:00 am until 4:00 pm. We offer Australia wide delivery of all our products including wet area under flooring.