Celotex FF4000 Product Applications

Celotex FF4000 is purpose designed for use in internal underfloor heating applications.

Product Details

The Celotex FF4000 product range is aimed specifically at the underfloor heating market where the increased compressive strength of the board provides better dimensional stability and resistance to site traffic during installation whilst the foam structure ensures better pipe clip retention.

FF4000 is manufactured using rigid polyisocyanurate foam and zero ozone depletion
potential (ODP) blowing agents with low global warming potential (GWP) and low
emissivity aluminium foil facings on both sides.

Product Benefits

Celotex FF4000 insulation for a board that:

Ensures minimal downward heat loss into structure
Is easy to cut and fit into most spaces
Uses the foam structure to ensure better pipe clip retention
Provides reliable long term energy savings for buildings
Has excellent dimensional stability
Is supplied in board sizes convenient for handling indoors
Is available in two different board sizes: 1200mm x 600mm and 1200mm x 2400mm

Product Values

Installation Guidelines

Pre-installation guidelines for concrete slab floor applications only

Install a damp proof membrane (DPM) below the slab, or apply a liquid waterproofing membrane to the top surface of
the slab.
The DPM must provide continuity with the damp proof course in the surrounding walls.
Level the surface of the slab; it should be smooth and free of projections.
Use a thin layer of sand blinding on a rough tamped slab to ensure that the insulation boards are continuously supported.

Installation guidelines for concrete slab and beam& block floor applications

Use Celotex TB4000 boards as upstands to fit around the floor perimeters to eliminate thermal bridging at screed edges.
The upstand depth should be equal to the sum of the slab insulation and the screed thickness. The upstand thickness should not exceed the combined thicknesses of the wall plaster and the skirting.

Lay the insulation boards directly onto the prepared slab / beam and block with all joints tightly butted.
Install a polythene membrane over the insulation.
Lay a proprietary underfloor heating system, generally comprising pipework in coils. Pipe retaining clips may be inserted directly into the Celotex insulation.
Apply the screed over the Celotex insulation boards to a thickness recommended by the manufacturer of the underfloor heating system (normally 75mm).
Compact the screed solidly when laid.
Allow the screed to dry thoroughly before an impermeable surface, such as a vinyl finish, is applied.
These recommendations are suitable for normal domestic floor loadings. If higher loadings are required, it may be necessary to increase the screed thickness and provide reinforcement within the screed. Consult a structural engineer or a specialist flooring contractor.

Installation guidelines for suspended timber floor applications

Install joists in the conventional manner, with solid or diagonal strut bracing as necessary. (NB: diagonal bracing may lead to thermal bridging).
Fix battens to the sides of the joists to support the insulation and to form a cavity for the underfloor heating, between the insulation and floor boards.
Cut the Celotex FF4000 insulation to achieve a tight fit, then push the boards firmly down between the joists.
Insulate the gaps between the joists and wall to prevent thermal bridging.
Lay a proprietary underfloor heating system within the cavity, generally comprising pipework in coils, to the manufacturer’s guidelines.
Install either chipboard or soft wood boarding directly onto the joists.

Manufacturer's details

Celotex Limited, Lady Lane Industrial Estate, Hadleigh, Ipswich, Suffolk, IP7 6BA

Web site: Celotex Home Page

Web site: Celotex U-value Calclator

Celotex Technical Advisory Service

While just-insulation provides the very best products at the very best prices ...
For the very best advise we recommend you contact the Celotex Technical Advisory Service.
Tel: 0901 996 0100 (30p per minute) Fax: 01473 820 889 Email: technical@celotex.co.uk