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Newly Developed, BBA Certified, Gen-X Multi-Layer Thermo Reflective Foil Insulation

Gen-X is a newly developed, BBA certified, multi-layer foil insulation, complete thermal insulant, air leakage and vapour barrier in one product.

Gen-X creates a thermally insulated and airtight roofspace that ensures energy savings that will dramatically reduce your power consumption and carbon footprint.

Using reflective technology, Gen-X helps prevent your roof space from overheating in summer by reflecting the electromagnetic radiation from the sun whilst retaining warmth in winter. It also helps seal your roof against climatic elements such as wind and damp whilst retaining ventilation. It has an exceptional high water vapour resistance with a measured value in excess of 6000MNsg

BBA Certified, Part ‘L’ Building Regulations Compliant, and NHBC Accepted ... Gen-X® seven layered, 33mm, multi-foil insulation, is an all-in-one complete thermal insulant, and vapour barrier that can seal the envelope of the building.

Gen-X's BBA Certificate indicates that it is ideal for applications requiring secondary insulation such as Celotex Tuff-R GA4075 or 100mm glasswool (0.032W/m2K). And, in under roof installations does not require either a vapour barrier, nor foil-backed plasterboard ... which equates to considerable cost savings.

When installed as directed in Gen-X's BBA Certificate, it will create a thermal airtight roof-space with minimal air leakage. That, combined with the target U-Value achieved, will give additional energy savings that will dramatically reduce your carbon emissions. Roofs incorporating Gen-X® can contribute to a building meeting its target emissions rate by reducing its carbon footprint.

Description

Gen X Multifoil Insulation is an insulation material comprising outer layers of coated metallised film, laminated to a polymer fabric enclosing the core and stitched and taped along both long edges.

The core of the product consists of three layers of polyester fibre wadding (white colour) separated by two metallised film layers.

The product is available in the following size:

Length 12.5 meters • Width 1.2 meters • Thickness 33.0mm

Ancillary items used with the product can include:

Aluminized self adhesive tape • 14mm galvanized staples or nails • Vapour control layer • Roof tile underlay or Breather Membrane • Pre-treated counter battens, softwood battens and tiling laths • Roofing slates or tiles • Additional insulation where required.

Where Gen-X multi-foil insulation should be used

Gen X multifoil Insulation is a flexible insulation used in conjunction with other insulation materials to reduce the U value (thermal transmittance) in new or existing pitched roofs.

The product is for use above and below rafters.

When installed under the rafters, the product performs as a vapour control layer in the roof system

The product is for use in constructions where the ceiling follows the pitch of the roof and encloses a habitable space.

The product must be used in conjunction with an appropriate roof tile underlay. Care must be taken to ensure that the product is covered after installation, as it must not be exposed to rain, showers or wind-driven rain.

Care must be taken to ensure the product does not come into contact with heat sources greater than 80°C.

Practicability of installation The product can be installed simply by following the instructions supplied.

Typical Applications with a U-Value of 0.20W/m2K (Based on 600mm centres)

Below Rafter Installation & PUR / PIR Boards such as Celotex Tuff-R GA4075

Below Rafter Installation & PUR / PIR Boards such as Celotex GA4075 Tuff-R

.Below Rafter Installation with 100mm Glasswool such as Knauf Rafter Roll 32

Above Rafter Installation with 100mm Glasswool such as Knauf Rafter Roll 32 100mm

Thermal performance

Calculations of the thermal transmittance (U value) of specific roof constructions incorporating the product should be carried out in accordance with BS EN ISO 6946 : 1997 and BRE report (BR 443 : 2006), Conventions for U-value calculations using the following values:

• Emissivity of outer layers 0.17

• Core thermal resistance 0.97

• Thermal resistance of insulation with minimum air layer either side 1.9

For constructions incorporating a number of non-ventilated cavities and a low overall U value, convective and radiative heat transfer across cavities can be less than those predicted by the ‘simplified’ method in BS EN ISO 6946 : 1997. This can be seen in the results of guarded hot box testing or by detailed calculations, for example using ISO 15099 : 2003. Such values are, however, construction specific and cannot be transferred between one construction to another.

Condensation risk

Interstitial condensation

Roofs incorporating the product will adequately limit the risk of interstitial condensation when designed and constructed in accordance with BS 5250 : 2002, Section 8.4 and Appendix D.

The risk of interstitial condensation is greatest when the building is drying out after construction. Guidance on preventing condensation from this and other sources is given in BRE Digest 369 Interstitial condensation and fabric degradation and BRE report (BR 262 : 2002) Thermal insulation: avoiding risks.

The product has a high water vapour resistance with a measured value in excess of 6000 MNsg–1.

When installed in accordance with section 13 and in a continuous layer, the product will provide a convection free envelope of high vapour resistance.

The product will perform as a vapour control layer and should be used in conjunction with a vapour permeable roof tile underlay.

In all cases, where high vapour resistance roof tile underlays are used, ventilation to the air space should be in accordance with the recommendations of BS 5250 : 2002 or relevant BBA Certificate for the roof tile underlay. When installed in conjunction with other insulation materials, the water vapour resistance and installation instructions of the additional insulation should be taken into consideration.

Surface condensation

Roofs will adequately limit the risk of surface condensation when the thermal transmittance (U value) does not exceed 0.35 Wm–2K–1 at any point and the junctions with walls are designed in accordance with the relevant requirements of TSO 2002 or BRE Information Paper IP 1/06.

Roofs will adequately limit the risk of surface condensation when the thermal transmittance (U value) does not exceed 1.2 Wm–2K–1 at any point. Guidance may be obtained from Section 8 of BS 5250 : 2002 and BRE report (BR 262 : 2002).

Behaviour in relation to fire

The Certificate holder has declared that the product when tested for reaction to fire to BS EN ISO 11925-2 : 2002, achieved a Class E rating in accordance with BS EN 13501-1 : 2007.

When installed with an internal lining board, eg 12.5 mm thick plasterboard, the insulation will be contained between the roof and internal lining board, until one is destroyed. Therefore, the insulation will not contribute to the development stages of a fire or present a smoke or toxic hazard.

The insulation must not be carried over junctions between roofs and walls required to provide a minimum period of fire resistance. The continuity of fire resistance must be maintained, for example as described in:

England and Wales — Approved Document B, Volume 1, Sections 5.11 to 5.12

Scotland — Mandatory Standard 2.2, clause 2.2.10(1) (1) Technical Handbook (Domestic).

Northern Ireland — Technical Booklet E, paragraph 3.21.

The use of the product will not affect the fire rating obtained by tiled or slated roofs when evaluated by assessment or test to BS 476-3 : 1958.

When installed with other additional insulation materials, the fire properties of these materials must be taken into consideration.

Proximity of flues and appliances

When the product is installed in close proximity to certain flue pipes and/or heat-producing appliances, for buildings subject to national Building Regulations the relevant provisions and guidance given below should be met:

England and Wales — Approved Document J

Scotland — Mandatory Standard 3.19, clause 3.19.4(1) (1) Technical Handbook (Domestic).

Northern Ireland — Technical Booklet L.

Air leakage

The insulation was tested to BS EN 12114 : 2000 with positive pressure of 50 Pa and 100 Pa. The leakage rate was 0.1 m3 h–1m–2 and 0.4 m3 h–1m–2 respectively.

When the product is used as a vapour control layer and an air barrier, the airtightness of the system is reliant on the careful sealing of the insulation and is dependent on maintaining the integrity of seal throughout. In addition to sealing at all joints, the insulation must be suitably sealed at the perimeter and all penetrations. Details of sealing at eaves, ridges, hips, valleys and penetrations must be in accordance with the Certificate holder’s instructions.

The airtightness of the building will also be dependent on the performance of the other building elements. Provided these also incorporate appropriate design details and building techniques, air infiltration through the building fabric should be minimal and the building reasonably airtight.

De-rating of electrical cables

As with other insulation products, it may be necessary in some cases to de-rate electrical cables buried in insulation. In BS 7671 : 2001 it is suggested that where wiring is completely surrounded by insulation, it may need to be de-rated to as low as half its free air current carrying capacity. Guidance should be sought from a qualified electrician.

Installing Gen-X multi-foil

The installation of Gen X Multifoil Insulation and additional insulation products should be in accordance with the instructions included within BBA Certificate 08/4543 and current good building practice.

During construction, care must be taken to ensure the product is not damaged during installation. Should damage occur by tearing, the product should be repaired with tape or replaced.

The product is attached to the rafters by using staples or nails of at least 14 mm length.

The product must have overlap joints of at least 50 mm and be taped along the entire length of the joint with Aluminised Self Adhesive Tape.

When the product is cut to fit around openings, eg the roof perimeter, care should be taken to minimise gaps.

The product can be cut easily by using sharp scissors or a knife.

Any exposed cut edges of the product should be sealed with aluminised adhesive tape.

Prior to fixing the product, sufficient time must be allowed for the dispersion of solvents contained in some wood preservatives and damp-proofing treatments where applied. Backgrounds should be allowed to dry out before fixing the system.

Procedure for below rafters installation

Installation starts from the ridge with the product being unrolled parallel to the eaves.

As the product is unrolled across the rafters, it is fixed in place using nails or staples of at least 14 mm depth.

The next roll must overlap the preceding layer by at least 50 mm, and the overlap should be sealed along the entire length using tape

The product should be permanently held in place using wooden battens fixed with nails. Battens may run perpendicular to the rafters.

When the bottom layer has been battened, any excess material may be cut by running a sharp knife along the edge parallel to floor level.

Any exposed cut edges of the product should be sealed with a suitable adhesive tape. Any tears or holes in the outer layer should be repaired with aluminised self-adhesive tape.

A plasterboard is fixed to the battens. The batten size should be at least 32 mm by 25 mm, and fixed with sufficient fixings. This batten size should be sufficient to ensure a 20 mm air gap between the product and the plasterboard. Additional insulation

When used with other additional insulation materials, care should be taken to ensure that all gaps are maintained in accordance with the manufacturer’s instructions for their products, and advice should be sought from the Certificate holder.

Rigid polyurethane (PUR) or rigid polyisocyanurate (PIR) products can be placed with a 25 mm gap above and below the Gen X insulation between rafters. Suitable fixings such as wooden battens nailed to the sides of the rafters or clips should be used in accordance with the manufacturer’s instructions.

Procedure for Gen-X above rafter installation

Installation starts from eaves and the insulation is unrolled parallel to the eaves.

As the product is unrolled across the rafters it is fixed using nails or staples of at least 14 mm length.

The next roll must overlap the preceding layer by at least 50 mm, and the overlap should be sealed along the entire length using Gen X tape.

The product should be permanently fixed in place using wooden counter battens 32 mm by 25 mm parallel to the rafters, held in place with nails.

When the top layer has been counter battened, any excess material may folded over the ridge and counter battened on completion of the opposite pitch.

A breathable roofing membrane (ie roof tile underlay) should be installed on the counter battens and tiling battens attached perpendicular to the rafters.

Roof tiles or slates are installed in accordance with BS 5534 : 2003.

When applying roof tiles or slates to a warm roof construction the recommendations of the tile/slate manufacturer should be followed.

Fitting insulation - Gen-X Above Rafters

Step 1

Starting from the eaves. Gen-X is unrolled across the rafters.

Step 2

Fix to the rafters using 14mm min galvanised staples or nails, keeping Gen-X taut between each rafter.

Step 3

Permanently fix Gen-X in place by nailing or screwing to 32 x 25mm min wooden counter battens down each rafter.

Step 4

Overlap next roll by at lease 50mm and seal this overlap with Gen-X Tape.

Step 5

Remove excess Gen-X using sharp scissors or knife. At gable ends, ridge and verges allow at least 50mm. This edge should be folded and stapled/nailed and the cut edge sealed with Aluminised Tape.

Step 6

A breathable roofing membrane should be installed on the counter battens and tilings battens attached perpendicular to rafters.

Step 7

Install roof tiles or slates.

Fitting instructions - Gen-X Below Rafters

Step 1

Starting from the ridge. Gen-X is unrolled across the rafters.

Step 2

Fix to the rafters using 14mm min galvanised staples or nails, keeping Gen-X taut between each rafter.

Step 3

Permanently fix Gen-X in place by nailing or screwing to 32 x 25mm min wooden battens parallel or perpendicular to the rafters. Ensure there is a 20mm min gap by fixing the batten on the 25mm face.

Step 4

Overlap next roll by at least 50mm and seal this overlap with Aluminised Tape.

Step 5

Remove excess Gen-X using sharp scissors or knife. At gable ends, ridge, purlins and wall plate allow at least 50mm. This edge should be folded and stapled/nailed and the cut edge sealed with Gen-X Tape.

Step 6

Fix plasterboard to the battens.

Fitting additional insulation

When Gen-X is used with other insulation materials, care should be taken that all air gaps are maintained in accordance with manufacturers instructions for an unventilated pitched roof.

Gen-X should be installed in accordance with BBA certificate no. 08/4543.

 

 

 

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Manufacturer's Contact Details

Euroform Products Limited, The Heliport, Lyncastle Road, Appleton, Warrington, WA4 4SN, England
Tel: +44 (0) 1925 860999 - Fax: +44 (0) 1925 860066
Email: sales@euroform.com - Internet: www.euroform.com

This page was last updated: Monday December 5, 2011

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