• 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

• the DPM can act as a Radon barrier if an appropriate material is specified and the membrane extended across the wall cavity to the outer leaf.
• cavity wall insulation should end at least 150mm below the top of the floor insulation to reduce thermal bridging at the wall/floor junction.
• a timber batten at the edge of the screed allows easy fixing of floorboards.
• ay a polyethylene separating layer over QUINN-therm boards to prevent moisture from the screed penetrating board junctions and causing movement.
• whilst a screeded floor is illustrated, timber flooring may be laid directly onto QUINN-therm QF

Introduction

QUINN-therm QF (Quinn Floor) is a PIR (polyisocyanurate) insulation board suitable for insulating groundbearing floors above the concrete slab.

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.

Applying insulation to a groundbearing floor between the slab and the screed or finish minimises thermal bridging at the wall junction in timber framed construction and creates a floor with a rapid thermal response, which matches that of the rest of the building.

QUINN-therm QF is ideal for insulating floors above the slab: it is strong enough to withstand the dead and imposed loads of 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.

Hot water and electric underfloor heating systems should be installed over a layer of rigid thermal insulation in order to minimise heat loss through the floor and improve the response time. QUINN-therm is ideal for use with underfloor heating. Pipes, cables or mats may be laid directly onto the insulation, or over a separating layer, and clipped in place, before being covered by a screed. Consult the heating system manufacturer for further details.

Installation Guidance

1. Ensure the surface of the floor slab is level (no more than ±5mm deflection over 3m).
2. Lay the damp-proof membrane (DPM) with joints lapped 300mm and sealed: seal to the damp-proof course (DPC).
3. Fit QUINN-therm against floor perimeter to form edge insulation. The insulation should be deep enough to reach the top of the screed.
4. Lay QUINN-therm QF boards in broken bond; butt tightly together and to the edge insulation. Pour screed.

Notes

• Cut QUINN-therm QF to fit neatly round penetrations.
• Ensure QUINN-therm QW wall insulation extends below the level of floor insulation to prevent thermal bridging.
• When flooring is installed directly onto QUINN-therm QF build partition walls directly off the structural floor or timber battens: do not build walls off QUINN-therm QF.
• Install battens at thresholds, foot of stairs and beneath kitchen and sanitary fittings to prevent deformation by high point loadings.