• Floor Insulation
• Above groundbearing concrete slab
• Below groundbearing concrete slab
• Concrete, beam and block floors
• Timber floors

 

Key Properties

QUINN-therm

• does not readily absorb water, making it suitable for use in damp environments;
• is light, robust and easy to handle; it may be worked using a saw or sharp knife;
• is durable and will perform for the service life of the building.

Meeting Regulations

Design Notes

• where a Radon barrier is required it should be installed within the concrete or gravel cover of the floor and continued through the entire thickness of the wall.
• wall insulation must extend 150mm below the upper edge of floor insulation to prevent thermal bridging.
• ventilation is required to prevent problems with damp.

Introduction

QUINN-therm QF (Quinn Floor) is a PIR (polyisocyanurate) insulation board intended for use in suspended timber floors.

QUINN-therm consists of a core of PIR foam bonded on both faces to composite aluminium facings; the gas filled cells give QUINN-therm its high thermal performance and strength.

The simplest way of ensuring suspended timber ground floors achieve the thermal performance required by building regulations is to fit rigid insulation boards between the joists. On exposed floors, such as those above garages, the insulation may be applied in a continuous layer to the underside of the rafters to minimise thermal bridging.

QUINN-therm QF offers an ideal solution for insulating new floors and upgrading existing floors; its low thermal conductivity minimises the necessary board thickness, while its good workability makes it straightforward to install.

Installation Guidance

1. Fit supports to the joists. Use either:
   • purpose-made saddle clips at 400mm centres,
   • stainless steel nails partially driven into the joists at 400mm centres, or
   • preservative treated timber battens nailed to the joists.
   Position the supports so the depth of joist above the batten matches the thickness of QUINN-therm boards*.
2. Cut QUINN-therm QF boards to fit tightly between the joists.
3. Fit QUINN-therm QF boards between the joists and press down until they sit on the supports.
4. Pack strips of QUINN-therm QF between the joists and perimeter walls to avoid thermal bridging.
5. Lay floorboards or sheet flooring.

Notes

• Ensure QUINN-therm QF boards are tight to the underside of the flooring to avoid air movement*.
• Cut QUINN-therm QF to fit neatly around service penetrations and seal.
• Ensure subfloor ventilation paths are maintained.

Handling and Storage

QUINN-therm QF boards are supplied in shrink-wrapped packs. Store boards under cover and out of direct sunlight, keeping boards flat.

When handling QUINN-therm QF do not knock corners and edges. Cut QUINN-therm QF with a fine tooth saw or trimming knife.

* Where central heating pipes run between joists install QUINN-therm QF below the pipes, leaving an air gap between the insulation and the underside of the flooring.