Unitherm™ Underslab Insulation

Unitherm™ is a durable and energy-efficient solution for insulation applications and the ideal material to stop energy loss at the foundation slab. It exceeds ASTM C578 Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation. 

Unitherm™ is made from Unipoly™, a light-weight moulded polystyrene material with exceptional thermal insulation properties. 


  • Underslab Insulation
  • Perimeter Slab Insulation
  • Under Floor Thermal Barrier
  • Under Floor Footings
  • Residential Slabs
  • Factory Floors
  • Refrigerated (Cool) Rooms
  • Best used in conjunction with Unipods. 


  • Compressive strength
  • Can withstand loads from large vehicles and equipment
  • Saves energy
  • Meets code requirements
  • Retains long-term R-value 
  • Moisture resistance
  • No thermal drift

Underslab Insulation

Unitherm™ delivers the high compressive strength and energy efficiency required in residential slabs, preventing thermal loss through the ground. It can be layered to achieve extremely high thermal resistance. 

Underfloor Heating

Install Unitherm™ beneath the concrete slab to ensure optimal heating performance. Minimising heat loss will reduce energy costs. 

Perimeter Insulation

Installation of Unitherm™ perimeter insulation is the simplest, most effective way to improve ythe thermal performance of the concrete slab. 

Download Unitherm Brochure