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YBS Breather Foil FR - Fire Retardant Breather Membrane

The YBS FR Breather Foil timber-framed wall system creates a wind-tight, draught-free, weather-sealed, yet vapour-permeable enclosure, when used in conjunction with external cladding, such as tile-hanging, masonry or weather-boarding.

Whether pre-fabricated or assembled on site, YBS FR Breather Foil can afford the designer and contractor maximum flexibility when detailing timber-frame walls, without the expense of thicker timber frames or higher priced materials.

Breather Foil FR is delivered in rolls packed in a protective sealed bag and should include product name, dimensions, the BDA Agrément number BAW 09-311 and identification mark.

 

Roof with an insulating breathing layer all in one!

YBS FR Breather Foil Roofing Membrane is multi-layer aluminium bubble film insulation.The aluminium is protected with a special coating to give durability and corrosion resistance therefore creating a fully waterproof insulation system.

YBS FR Breather Foil Roofing Membrane is a specially designed Foil Breathing Membrane designed for use as an underlay for tiled or slated roofs.

YBS FR Breather Foil Roofing Membrane can be fixed onto sarking board or board insulation,

YBS FR Breather Foil Roofing Membrane, will easily allow moisture out of the building, whilst protecting against the elements.

YBS FR Breather Foil Roofing Membrane has the added advantage of being equivalent to approximately 15mm of Polyurethane insulation, thereby reduce roof heights and costs.

 

 

The YBS FR Breather Foil timber-frame wall system

YBS FR Breather Foil protects the timber frame components during construction

YBS FR Breather Foil details and installation procedures apply regardless of cladding type

YBS FR Breather Foil will protect the timber and insulation components from the elements

 

Product Characteristics

Thermal resistance of foil, bubble film laminate and minimum 20 mm clear cavity .
Rg (ref.7, 9) = 0,790 m2.K.W-1

Hemispherical thermal emittance of foil face = 0,05

Thermal resistance, bubble film laminate only (ref. 7) = 0,125 m2.K.W

Nail tear resistance (ref.10,wet & dry), minimal = 70 N

Installed air permeability at 50 Pa BS EN 12153 = 36 m3.m-2.(24h)

Nominal thickness = 4 mm

Nominal width = 1350 mm - Nominal length:25 m, or

Nominal width = 2620 mm - Nominal length: 50 m

Ancillary requirements

Breather-Foil Insulation foil-backed tape with acrylic adhesive, width 75 mm

14 mm staples or nails

Vapour control layer

 

Certification, Testing and Compliance

Directive BDA Agréments (Praktijkbladen), September 2008

BDA Agrément Nr. BAW 09-312 YBS FR Breather Foil (phase: installation)

BDA Agrément Nr. BAW 09-313 YBS FR Breather Foil (phase: regulations)

BS 5250: 2002 Code of practice for control of condensation in buildings

BS 5268 Code of practice for timber

BS 5628 Part 3:2001 Code of practice for the use of masonry: materials and components, design and workmanship

EN 12667:2001-02 Thermal performance of building materials and products – Determination of thermal resistance bymeans of guarded hot plate and heat flow meter methods – Products of high and medium thermal resistance

EN 12153:2000 Curtain walling – Air permeability - Test method

EN-ISO 6946:2008 Building components and building elements. Thermal resistance and thermal transmittance. Calculation method

BS 4016:1997 Specification for flexible building membranes (breather type)

BRE Test report nr. 210-258: Hygrothermal testing of YBS FR Breather Foil, 2002.10.30

BRE Test report nr. 200132: Tests on Airtec FRB Breather Membrane1), 2001.04.02

Warrington Fire Research Centre Ltd. Test report nr. 121767: Determination of classification in accordance with BS 476, part 7: 1997, 2001.11.201) ... Now named YBS FR Breather Foil

 

Condensation and water penetration risk

Walls incorporating the product will adequately limit the risk of interstitial condensation when designed in accordancewith the BDA Agrément and installed in accordance with BDA Agrément Nr. BAW 09-312 YBS FR Breather Foil (phase: installation, ref.2)

YBS FR Breather Foil presents no significant risk of water penetration provided that masonry cavity walls are designed andconstructed to the requirements of BS 5628 Part 3 (ref.6) to prevent moisture penetration, that discontinuouscladding has appropriate laps and due attention is made of the building exposure rating. Where the clear cavity, afterthe installation of YBS FR Breather Foil, exceeds 50 mm the product can be used in any exposure zone

it is essential that cavity walls incorporating the product in the cavity are designed in such a way that they contain thenormal precautions against moisture ingress

specifically the continuity of vapour control layers must be maintained at laps and joints

all sorts of perforations should be kept to a minimum and well be sealed

YBS FR Breather Foil does not absorb water by capillarity. Where YBS FR Breather Foil bridges dpc level, water is not transferredfrom the ground to the construction.

 

Behaviour in relation to fire

YBS FR Breather Foil will not impair the fire resistance performance of the walls.

Since the insulation is combustible it mustbe adequately separated from: heat producing appliances, incinerators, hearths, ductwork for high temperature gases,flues, chimneys and fire places or recesses (see ref.3) when tested to BS 476 Part 7 Surface spread of flame YBS FR Breather Foil is designated Class 1.6.

 

Durability

The product is stable, rot-proof and durable and will remain effective as an insulant and vapour open cavity rain barrierfor the life of the building in which it is installed. There is no risk for moth or beetle infestation.

 

General

Installation of YBS FR Breather Foil and additional products should be in accordance with the Certificate holder’s instructions and current good building practice

During installation care must be taken to avoid damaging of the product. Should damage occur, holes in the productshould be repaired with suitable tape, as provided by the Certificate holder

The product should be attached to the inner leaf timber frame sheathing by using staples or nails of at least 14 mmlength and secured with wall ties

YBS FR Breather Foil must be applied with the foil face of the bubble film facing outwards into the cavity, ensuring 75 mmhorizontal overlaps are positioned to create a waterproofing lap

When the product is cut to fit around openings or connections, gaps must be minimized; any exposed cut edges shouldbe sealed with suitable tape, as provided by the Certificate holder

The outer leaf must be built ensuring that the designed minimum clear cavity is maintained. After raising each masonrysection, loose mortar must be cleaned from the insulation, not allowing mortar to fall into the cavity

At external and internal corners YBS FR Breather Foil should be laid with a minimum 150 mm overlap. It should be wrappedaround the corner and the overlap secured with staples

At ground level YBS FR Breather Foil must extend below the level of internal flooring insulation. The installation of YBS FR Breather Foil should be carried out to the highest level of each wall

During construction YBS FR Breather Foil will provide a temporary rain screen, but the external cladding should be completed as soon as possible. In exposed conditions the vertical laps must be secured with battens

 

Delivery and site handling

The product is delivered to site in rolls packed in a protective bag sealed with a plastic tie. Fitting instructions are placedin the bag

The rolls should be stored in clean, dry conditions, not exposed to sunlight

The product must be protected from being dropped or crushed by objects. Care must be exercised when storing largequantities on site

The product must not be exposed to open flame or other ignition sources and must be stored away from flammable material such as paint and solvents

To ensure maximum performance of the product when installed, on site precautions must be taken to protect it from mud and dirt.

 

Maintenance and repair

Once installed, the product does not require any maintenance for the design life of the building, provided that it remainsinstalled strictly in accordance with the requirements of the BDA Agrément and of the manufacturer.

 

Roof Installation

The Ultimate Insulating, Breathing Roof Protection

In roofs covered with rigid insulation or sarking boards, Breather Foil-FR Roofing Membrane is laid in the normal manner, prior to the counter battens and the tiling battens being applied.

The Code of Practice for slating and tiling, BS 5534; Part 1 : 1978 (1985). Installation can be carried out under all conditions normal to roofing work. Corrosion resistant staples or galvanised clout nails must be used at 200mm centres.

 

Wall Installation

The timber framework is to be constructed with the sheathing board in position.

YBS FR Breather Foil is rolled out into position and then stapled to the sheathing board.

An overlap of 200mm must be allowed at the lower edge of the panel. This is to allow for coverage of the lower sole plate or upper floor joists.

An overlap of 150mm must be allowed at the right hand edge of the panel. This is to allow for coverage and sealing of the vertical joint on assembled panels.

The end overlap and the bottom overlap should not be stapled, but left loose for site fixing.

All mid panel horizontal joints have an overlap of 75mm.

The upper layer must overlap the lower layer to allow any penetrating water to be dispersed to a safe outlet.

These horizontal laps are to be left open to allow the panels to breathe.

The location of the timber studs should now be highlighted with indelible ink to allow for future accurate positioning of the wall ties.

Any window and door openings are to be cut out with the YBS FR Breather Foil and can now be turned inside the opening and fixed to the studwork or cut flush to the edges of the opening.

 

Stacking/Transport

Stack and strap the panels, for transport, as normal. The bubbles compress slightly under load but DO NOT burst. They will reform once the panel is erected. The smooth surface of BF-FR means the timber panels slide off each other resulting in less damage.

 

Site Work

Panels are erected in to position with the overlaps to the bottom and to the right (looking from outside). After fixing the panels, the vertical overlaps are stapled. YBS YBS FR Breather Foil wall ties are fixed along the 'marked' vertical stud line as the external brick wall is built. The anti-glare membrane should be peeled off over the ties as the brick work progresses.

 

Site Work Exterior

If left exposed use edge battens fixed all around the perimeter to help prevent wind lifting and damaging the YBS FR Breather Foil in extreme conditions.

 

Technical References and Certification

British Board of Agrément - Certificate No. 09/4640
Building Regulations 2000 Approved Document LI, L2 Building Standards Part J.
BS EN ISO 6946 Thermal Resistance Calculation Downward Heat Flow.
BRE publication ‘Thermal Insulation: Avoiding the risks’.
BS EN ISO 13370 - Heat Transfer via The Ground Calculation Method.

 

Condensation Risk

Further to calculating the thermal insulation requirements through a cavity wall, a check should be made for predicting the risk of condensation within the structure.

This should be carried out using the method described in BS5250:1999.

 

Manufacturer's Contact Details

YBS Insulation Limited
The Crags Industrial, Park Morven Street, Creswell, Derbyshire, S80 4AJ, England

Technical Support 0871 9170044, Email: enquiries@ybsinsulation.com