• 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

• QUINN-therm QW shown fixed by battens. With uneven walls QUINN-therm QW should be fixed to battens packed true.
• set QUINN-therm QF boards on edge around the floor perimeter and extend cavity wall insulation at least 150mm below the top of the slab to reduce thermal bridging at the wall/floor junction.
• a VCL/slipsheet may be laid above the insulation to protect it from the concrete and to prevent condensation forming at interface of the slab and insulation.

Introduction

QUINN-therm QF (Quinn Floor) is a PIR (polyisocyanurate) insulation board intended for use beneath groundbearing concrete slabs.

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

Insulating beneath the floor slab brings the mass of the concrete within the insulation envelope, giving the building a steady thermal response. The design minimises thermal bridging and offers a straightforward construction sequence.

QUINN-therm is ideal for insulating floors beneath the slab: its high compressive strength enables it to withstand the dead and imposed loads transferred through the slab for domestic and light commercial applications, and it has a very low rate of moisture absorption. The low thermal conductivity of QUINN-therm minimises the thickness required for the floor to meet the heat loss standards of building regulations.

Installation Guidance

1. Level the surface of the hardcore with a blinding of clean sand. Ensure finished deflection is less than ±5mm over 3m.
2. Lay the damp-proof membrane (DPM). Lap joints by 300mm and seal. Lap and seal with the damp-proof course (DPM): with joints lapped 300mm and sealed. Take up to the dpc and sealed.
3. Fit QUINN-therm against perimeter walls to form edge insulation. The insulation should be deep enough to reach the top of the slab.
4. Lay QUINN-therm QF boards in broken bond. Butt boards tightly together and to edge insulation. Overlay with polyethylene slip sheet/vapour control layer.
5. Lap edges and turn up at perimeters. Lay the floor slab and screed.

Notes

• At service penetrations cut QUINN-therm neatly to fit.
• Protect exposed edge insulation at surface of slab until it is covered by skirting and/or wall plaster.
• Use barrow boards when laying the slab to prevent damaging to the insulation. Ensure QUINN-therm boards extend below the level of floor insulation.

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 with a fine tooth saw or trimming knife.