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Celotex T-Break TB4000 - previously TB3000 range

Celotex TB4000 is a multi-purpose insulation board developed to provide simple solutions for overcoming localised thermal bridges.

With low emissivity foil facings, TB4000 is manufactured from rigid polyisocyanurate (PIR) using a blend of blowing agents that have zero ozone depletion potential (zero ODP) and a low global warming impact.

The T-Break name stems from the design function of the range; which is to provide simple solutions to overcome localised thermal bridges. Celotex is unique in being able to offer boards as thin as 12 mm to the market for this purpose.

These products have similar characteristics to our Tuff-R range but with un-reinforced core foam.

These boards are available in the following thicknesses 12mm, 20mm, 25mm, and 30mm 35mm45mm, with a standard board size of 1200 x 2400 mm.

With Celotex TB4000 you are specifying an insulation board that ...

Is specifically designed to eliminate thermal bridges

Comes in thicknesses ranging from 12-45mm, making it the thinnest PIR insulation available

Is suitable for use in a number of applications including roof, wall and floor systems

Is easy to cut and shape

Includes low emissivity foil facings giving improved thermal insulation with cavity air spaces

Provides reliable long-term energy savings for buildings Applications Celotex TB4000 can be specified for use in a variety of applications including:

Pitched Roofs, Flat Roofs, Solid Masonry Walls, Timber Framed & Steel Framed systems, and Floors

Technical Specification

Description

Celotex T-Break TB4000 is a multi-purpose rigid polyisocyanurate foam (PIR) thermal insulation board with reflective foil facings. provides multi-purpose cavity wall insulation boards that are uniquely reinforced with glass-fibre and feature the best reaction-to-fire performance measured in accordance with new European Standards of any PUR / PIR (Rigid polyurethane / polyisocyanurate) product on the UK market.

Celotex T-Break TB4000 is installed in conjunction with an appropriate lining panel, for example standard gypsum plasterboard to BS 1230-1 : 1985.

The insulation boards are available in nominal dimensions of length (mm) 2400 x width (mm) 1200.

Required ancillary materials include large-headed nails, screws, washers, aluminium joint tape and sealant.

Compare board performance of Celotex GA4000 T-Break versus Celotex TB4000 Tuff-R

Available in a standard board size of 1200 x 2400mm with the following specifications ...

 

Celotex TB4000 T-Break (supersedes TB4000 Range as of July 2010) Technical Data
Product Code	Board dimensions (width) x (length) = (m²)	Thickness (mm)	R-value (m2K/W)	U-Value (W/m²K)	Weight (kg/m2)	Board weight (kg)
Celotex TB4012	1.2x2.4 = 2.88m²	12	0.50	2.00	0.50	1.44
Celotex TB4020	1.2x2.4 = 2.88m²	20	0.90	1.11	0.72	2.07
Celotex TB4025	1.2x2.4 = 2.88m²	25	1.10	0.91	0.85	2.45
Celotex TB4030	1.2x2.4 = 2.88m²	30	1.35	0.74	0.98	2.82
Celotex TB4035	1.2x2.4 = 2.88m²	35	1.55	0.65	1.11	3.20
Celotex TB4040	1.2x2.4 = 2.88m²	40	1.80	0.56	1.26	3.63
Celotex TB4045	1.2x2.4 = 2.88m²	45	2.00	0.50	1.40	4.03
Thermal conductivity / Lambda Value(W/mK) = 0.022: Compresive strength(kPa) = ≥ 120: Water vapour restistance (MNs/g) = > 150: Please Note: R-Value = Thermal Resistance; U-Value = Thermal Transmittance Co-efficient; Compressive strength = kiloPascals; Vapour resistance = MegaNewton seconds per gram.

 

Where Celotex T-Break TB4000 should be used

This thinner version of Celotex GA4000 Tuff-R Range can be used in any rafter or joist application where there is the need to minimize Thermal Bridging and improve U-Values.

Thermal Bridging

To understand thermal bridging more thoroughly, this is where a (often structural) member with poorer thermal performance has a lower thermal resistance. This is a matter of degree and cannot be avoided just minimised. Therefore, there is a need to compensate by increasing the level of general insulation.

To gain a more formal understanding, we quote NBS Building Regulations ...

Surface condensation – thermal bridging

Thermal bridging occurs when the continuity of the building fabric is broken by the penetration of an element allowing a significantly higher heat loss than its surroundings.

These ‘bridges’ commonly occur around openings such as lintels, jambs and sills and at wall/roof junctions, wall/floor junctions and where internal walls penetrate the outer fabric.

Thermal bridges provide a ready passage of heat transfer to the outside air and allow a heat flow entirely disproportionate to their surface area resulting in excessive heat losses.

Condensation may occur on the inner surfaces that can damage the dwelling or threaten the health of the occupants.

To minimise the risk of condensation on any inner surface, cold bridging at a floor, wall, roof or other building element should be avoided.

Detailing should be in accordance with the recommendations in Section 8 of BS 5250: 2002 [ CIS link: BS 5250:2002. (the code of practice for control of condensation in buildings + AMD 16119).

Also, to maintain an adequate internal surface temperature and thus minimise the risk of surface condensation, it is recommended that the thermal transmittance (U-value) of any part and at any point of the external fabric does not exceed 1.2 W/m2K.

 

U-Value - a definition

U-value (or thermal transmittance co-efficient) is a measure of how much heat will pass through one square metre of a structure when the temperatures on either side of the structure differ by 1 degree Celsius (expressed in W/m2K)

 

Further details

To avoid duplication, please review the Celotex GA4000 Tuff-R Rigid Board page ...

 

Manufacturer's details

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

Web site: Celotex Home Page

Web site: Celotex U-value Calculator

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