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Celotex Crown-Bond Bonded Single Ply Flat Roofing Boards - NEW!


Specialist Celotex Product, Crown-Bond is available in thickness’s between 50mm – 140mm from the manufacturer; lead-times apply to the following products: BD0050, BD0100, BD0120 and BD0140

Celotex's new Crown Bond range of higher specification boards replaces TD4000 Range.

Product Description

Celotex Crown-Bond is a high performance flat roofing insulation board featuring innovative composite facers on both sides, a low lambda value of 0.022 W/mK and a compressive strength of up to 150 kPa, providing increased dimensional stability and added robustness. 

Used in single-ply bonded applications and is suitable for fully sealed metal, timber and concrete decks.

Crown-Bond provides a quick and easy way to provide high thermal performance in flat roofing structures.

Crown-Bond is available in thickness’s between 50mm – 140mm from the manufacturer; lead-times apply to the following products: BD0050, BD0100, BD0120 and BD0140

Board size: 600 x 1200mm. Commonly available in thickness's of 100mm

Product Benefits

  • Specialist Celotex Product, Crown-Bond is available in thickness’s between 50mm – 140mm from the manufacturer; lead-times apply to the following products: BD0050, BD0100, BD0120 and BD0140
  • Crown-Bond is CFC/HCFC free with zero ODP and low GWP and CE marking compliance to BS EN 13165.
  • Crown-Bond is manufactured in accordance with quality management system ISO 9001 and environmental management system ISO 14001.
  • Innovative composite facers on both sides
  • Low lambda 0.022W/mK offering high thermal performance
  • Compatible with bonded single ply membranes
  • Suitable to be used on fully sealed metal, timber and concrete decks
  • Excellent compressive strength (≥ 150 kPa), giving it increased dimensional stability and added robustness Ideal for new build or refurbishment projects
  • Secured to the deck with fully bonded systems or thermally broken or mechanical fasteners

Product availability indicators

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Availability relies on stock levels at closest depots and upon transport logistics to effect deliveries

Technical Data

Celotex Crown-Bond Flat Roof Insulation Boards

Product Code

Board dimensions

Thickness (mm)

λ Value (w/mK)

R-value (m²K/W)

U Value (W/m²K)

Weight (kg/m²)

Unit weight (kg)

Crown-Bond (BD0050) 11 x 0.6 x 1.2m = 7.92m² 50 0.022 2.25 0.44 2.77 21.94
Crown-Bond (BD0100) 6 x 0.6 x 1.2m = 4.32m² 100 0.022 4.50 0.22 4.69 20.26
Crown-Bond (BD0120) 5 x 0.6 x 1.2m = 3.60m² 120 0.022 5.45 0.18 5.46 19.66
Crown-Bond (BD0140) 4 x 0.6 x 1.2m = 2.88m² 140 0.022 6.35 0.16 6.23 17.94

Thermal conductivity / Lambda value (W/mK) = 0.022 | Compressive strength (kPa) = ≥ 150 | Dimensional stability DS(70,90)3 – DS(-20-)1.
Please Note: R-Value = Thermal Resistance; U Value = Thermal Transmittance Co-efficient; Compressive strength = kiloPascals; Vapour resistance = MegaNewton seconds per gram.

Construction Build Up

Construction Concrete Deck Metal Deck Timber Deck
Outside surface resistance - - -
Single ply membrane 1.5 1.5 1.5
Variable layer See Below See Below See Below
Vapour Control Layer (VCL) - - -
Concrete deck 250 n/a n/a
Metal deck n/a 1.5 n/a
Timber deck plywood n/a n/a 19
Cavity between joist @ 11.7% bridging n/a n/a 150
Plasterboard n/a 12.5 12.5
Inside surface resistance - - -
Variable layer product Thickness (mm) U-value (W/m2K) U-value (W/m2K) U-value (W/m2K)
Celotex Crown-Bond 100 0.21 0.20 0.20
Celotex Crown-Bond 120 0.17 0.17 0.17
Celotex Crown-Bond 140 0.15 0.15 0.14

Product Information and Certification

Links to manufacturer's information. Click to download in a separate browser window.
Celotex Crown-Bond Datasheet | Celotex Bonded Flat Roof applications guide | Celotex Crown-Bond CE Marking | Celotex Handy Guide | Celotex Flat Roof Specification Guide

Product Installation

Celotex Crown Bond products can be installed in accordance with these instructions

Celotex insulation boards should not be installed when the temperature is at or below 4°C and falling.

Cold applied system

Celotex Crown-Bond high erformanceinsulation in bonded single ply flat roofing applications.

For single ply membranes, the vapour control layer (VCL) should be either polythene or reinforced aluminium foil. The VCL should be loose-laid immediately prior to installation of the Celotex Crown-Bond board and detailed at edges and abutments. The VCL should be sealed and taped to the top surface of the board.

Weathering system

Different types of weathering systems require different installation instructions and guidelines. Advice on the installation of these weathering systems should be sought from the manufacturer or provider of the weathering system.


When using adhesives, the installer should take care not to use products that contain chemicals likely to attack the insulating foam such as ketonic solvents. Celotex Crown-Bond contains no chemicals or solvents likely to damage a single ply membrane. When using adhesives, the installer should check the compatibility of the adhesive with the adhesive manufacturer.

Laying Pattern

It is recommended that boards are laid closely butted with joints break-bonded.
Celotex Crown-Bond can be installed as part of a two-layer system. The two layers of insulation should be staggered or horizontally offset against each other to prevent one vertical joint and mechanically fixed to the substrate.

Supporting Deck

The supporting deck must provide adequate support for the VCL and insulation board with joints being supported by the ridges of the deck. It must be capable of supporting the static and dynamic design loads and the loads associated with the construction activity without deflection in excess of the limits defined in BS EN 1991. The deck must be structurally sound, dry, clean and, where necessary, primed before application of the weathering and insulating system.


Celotex Crown-Bond is capable of withstanding the trafficking associated with normal roof laying work. However, roofs are generally designed for only occasional lightweight foot traffic or maintenance access. Where more frequent or heavier access is required, protected walkways should be provided. Under no circumstances should the roof be used as a working platform, either during or after the construction programme.


Celotex insulation boards should be stored dry, flat and clear of the ground. Only as much material as can be installed during a single working period should be removed from storage at any one time. If boards are stored under tarpaulins, care should be taken to prevent rope damage to boards.


When cutting Celotex insulation, dust extraction equipment, eye protection and face masks should be used. Dust or particles in the eyes should be washed out with liberal quantities of water. If skin is sensitive to fibre irritation, apply a barrier cream to exposed areas before handling.

Contact Manufacturer

Celotex Limited

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

Celotex Technical Advisory Service.

Telephone: 0901 996 0100 (30p per minute) - Fax: 01473 820 889
Web sites: Celotex Home Page / Celotex U-Value Calculator.

Contact us

Insulation Online Limited

Sales Office only:

39 Normandy Road, Worthing, West Sussex, BN14 7DX, UK

Telephone: 0333 8000 828