---

Celotex Extra-R XR4000 / XR4000

Manufactured using the latest state-of-the-art restrained rise production line and features the unique Celotex jointless laydown technology.

This technology enables Celotex to offer boards with no visible seams in the foam laydown. This product is targeted at cut-to-fit applications for installation between rafters or joists and will enable users to achieve lower u-values with a single layer of insulation than has been previously possible.

These products have similar characteristics to our Tuff-R range and are available in the following thicknesses 110mm, 120mm, 130mm, and 140mm 150mm and 200mm, with a standard board size of 1200 x 2400 mm

 

Technical Specification

Description

Like Celotex Tuff-R Zero GA4000, the XR4000 range is installed in conjunction with an appropriate lining panel, for example standard gypsum plasterboard to BS 1230-1 : 1985.

Celotex Xtra-R is a premium performance 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.

Compare Tuff-R and Xtra-R Board Sizes and Values

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

Celotex XR4000 Extra-R (supersedes XR4000 Range) 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 XR4000	1.2x2.4 = 2.88m²	110	5.00	0.20	3.59	10.34
Celotex XR4000	1.2x2.4 = 2.88m²	120	5.45	0.18	3.89	11.20
Celotex XR4000	1.2x2.4 = 2.88m²	130	5.90	0.17	4.20	12.10
Celotex XR4000	1.2x2.4 = 2.88m²	140	6.35	0.16	4.50	12.96
Celotex XR4000	1.2x2.4 = 2.88m²	150	6.80	0.15	4.81	13.85
Celotex XR4000	1.2x2.4 = 2.88m²	165	7.50	0.13	5.43	15.64
Celotex XR4000	1.2x2.4 = 2.88m²	200	9.05	0.11	6.63	19.09
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 Extra-R XR4000 should be used

This thicker version can be used in any rafter or joist application where there is the need to achieve improved u-Values from those available from a thinner board.

Celotex Extra-R XR4000 between rafters Insulation between rafters:

Use Celotex Extra-R XR4000 high performance thermal insulation in pitched roofs either between and under rafter or between the rafter applications to minimise insulation thickness and give the following benefits ...

Ideal for use where headroom is limited

Provides reliable long term energy savings for buildings

Low emissivity foil facers give improved thermal insulation with cavity air spaces

Creates a warm habitable roof space

No need to insulate water pipes and tanks

Suitable for new build and major refurbishment projects

Minimised additional loading to the structure

Ideal for loft conversions/room in roof applications

 

The void created by a pitched roof can be made habitable by insulating along the plane of the roof pitch with Celotex rigid PIR insulation boards. This creates a warm, potentially habitable roof space in which water pipes and tanks no longer need to be insulated.

If BS 747: 2000 slater's felt is being used, a minimum 50 mm ventilated air space must be provided between the felt and the cold side of the insulation in order to minimise the risk of condensation formation. This construction is known as a ventilated construction.

With some breathable membranes, the cold side of the insulation may be placed in direct contact with the membrane (check with membrane supplier prior to specification). However, the outer side of the membrane must be adjacent to an air space to allow moisture vapour to escape to the outside of the building. This is known as an unventilated construction.

Insulation for timber frame wall lining:

Celotex Insulation for timber frame wall lining Celotex utilises the low lambda values of Celotex tuff R GA4000 and ExtraR XR4000 between the studs, followed by an internal lining of Celotex T-Break TB4000 over the studs, providing for a thin build-up with the excellent thermal insulation.

Benefits:

Offers the thinnest solution available

Provides reliable long term energy savings for buildings

Low emissivity foil facers give improved thermal insulation with cavity air spaces

Provides a vapour control layer when board joints are taped

Reduces thermal bridging through studs and rails

Can be nailed direct to stud framing

Dryline directly over insulation

Provides cavity for services Installation guidelines

Suspended timber floor insulation

Fixing floppy quilt insulation between floor joists can be difficult. Insulating a suspended timber floor is made easy using Celotex Insulation cut to fit between joists.

The specification of insulation for ground floors is more complex than that for walls or roofs. This is because the mechanisms for heat flow are affected by the ratio of surface area to perimeter.

With a suspended timber floor, there is little choice but to install the insulation between the joists, but the thermal bridges created by the joists have to be considered.

Continuity of the insulation must be ensured by packing the spaces between the external walls and the joists with insulation. The void below an insulated suspended timber floor must be well ventilated. The insulation must be cut to fit tightly between the joists to prevent heat loss.

Installation:

Make sure all studs and rails are flush, with no projections, and that services are correctly installed.

Cut Celotex Extra-R XR4000 to fit tightly between all studs and rails.

For optimum thermal performance, the unprinted foil surface should face the air cavity.

Insert insulation into framing and push back to plywood sheathing.

Fit services in to cavity if required.

Measure the wall height from floor level to underside of ceiling joists and cut board length to suit, using a trimming knife.

Ensure that the wall insulation is continuous with the floor perimeter insulation.

Cut boards for infill panels, using off-cuts where possible, making sure there are no gaps at wall abutments.

Tightly butt edges of boards together, making sure there are no gaps.

Temporarily secure the boards with clout nails at 600 mm centres. Mark stud lines on board surface as fixing guides for dry lining.

Always fix back to solid timber, both at stud lines and at top and bottom rails.

Ensure that all board surfaces are clean and free from dust and then apply aluminum foil vapour-seal tape to all joints. Taping the joints of the Celotex insulation with self adhesive aluminum foil tape provides a good vapour control layer and improves air tightness.

Seal the insulation at all abutments and service penetrations with a vapour resistant sealant.

Fix plasterboard lining over the Celotex insulation using plasterboard nails or screws of appropriate length and joint or skim to the desired finish.

No separate vapour check membrane is required in this application; Celotex insulation acts as an effective internal vapour control layer when all joints are sealed. Suspended timber floor insulation Celotex

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