RETROTHERM is simple to install, it simply slides into place. The unique concertina edges allow for an airtight friction fit. Fixing can be enhanced using  a finger friendly RETROclip system or by using water based glues. RETROTHERM should be fitted hard up against the underside of the floorboards, as per the guidelines establised in 2006. Ensure there is no air gap, as any air movement between the insulating material and the floor boards will negatively impact on the overall thermal rating of the floor. 

RETROTHEM coomplies with all the requirments of the building code so no BRANZ appraisal is required. 

• Exceeds the minimum R Value 1.3m2 K/W requirements for timber floors as per 1996. Meets the installation requirements for undefloor insulation as per 2006. 
• Eliminates floor drafts. 
• Fast, easy and safe to install. 
• Non allergenic and non irritating. 
• Made from flame retardant polystyrene cut into convenient 1200mm length panels, 60mm thick. 
• Produced in three widths to fit most floor joists. 410mm, 470mm & 560mm. 
• Will not slump, sag or rot 
• Complies with the fire safetly requirements of the NZ Building Code Acceptable Solutions. 

Retrotherm underfloor polystyrene insulation can be installed after the flooring has been laid in new construction.

Retrotherm underfloor polystyrene insulation can be retrospectively fitted to concealed sub floor spaces in older vilas and bungalows, indeed any home that requires thermal insulation in a concealed sub floor application