Celotex SOL_TFW Insulation

CI/SfB | | (21.9) | Rn7 | (M2) |January 2004

Insulation of timber frame wallsCelotex tuff-R Zero GA3000Z

The requirement

Specify insulation for timber frame walling that:

achieves U-values with minimum thickness

has zero ozone depletion potential

provides a high standard of airtightness

has low emissivity facings for improved thermal resistance in air spaces

is strong and durable

is non-hygroscopic

is rot proof

is dimensionally stable, unaffected by temperature cycles

is easy to cut and shape

The solution

Celotex tuff-R Zero GA3000Z ful ls all of the requirements opposite and can be used to

insulate timber frame walls.

Celotex tuff-R Zero GA3000Z has been introduced as a direct replacement for Celotex

double-R GA2000. It features a blend of hydrocarbon blowing agents that have zero

Ozone Depletion Potential together with very low Global Warming Potential. This ensures

compliance with international legislation such as the Montreal and Kyoto protocols.

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Technical Services: T 01473 820888 F 01473 820889 E [email protected] W www.celotex.co.uk

Speci cation

Min. U-value required 0.35 W/mK 0.3 W/mK 0.27 W/mK

Celotex tuff-R Zero GA3045Z GA3055Z GA3060Z

Thickness 45 mm 55 mm 60 mm

Visit www.celotex.co.uk for latest information and regional variations.

Calculations

Construction type 1

Element Wall (timber frame sheathed)

Internal surface emissivity High

External surface emissivity High

Building use BS 5250 dry/moist occupancy

Construction

Thickness Thermal Thermal Pitch and

(mm) conductivity resistance Bridge Details

(W/mK) (mK/W)

Outside surface resistance 0.040

Brick 103.0 0.770 0.134 17.2% mortar

(103 mm)

Cavity (low emissivity) 50.0 0.440

Celotex tuff-R Zero GA3000Z 45.0 0.023 1.950 delta U = 0.01

Plywood 9.0 0.143 0.063

Cavity >24 mm, wall 89.0 0.180 15% timber

(89 mm)

Gypsum Wallboard 12.5 0.160 0.080

Inside surface resistance 0.130

U-value - 0.33 W/mK

U-value: Combined method: 0.33 W/mK

(lower limit = 3.038 mK/W, upper limit = 3.082 mK/W, dUf 0.00, dUg 0.00).

Correction for mechanical fasteners, Delta Uf = 0.000 W/mK.

Correction for air gaps, Delta Ug = 0.004 W/mK.

(Based on the combined method for determining U-values of structures containing repeating thermal bridges).

Construction type 2

Element Wall (timber frame sheathed)




Construction

Thickness Thermal Thermal Pitch and

(mm) conductivity resistance Bridge Details

(W/mK) (mK/W)


Brick 103.0 0.770 0.134 17.2% mortar

(103 mm)



Plywood 9.0 0.143 0.063

Cavity >24 mm, wall 89.0 0.180 15% timber

(89 mm)



U-value - 0.29 W/mK






Installation guidelines (timber frame wall sheathing)

Fix full size sheets of tuff-R Zero GA3000Z to the

external ply sheathing using galvanised clout nails at

300 mm centres around board perimeters, 400 mm

centres in the eld of the board.

Use guidelines printed on the tuff-R Zero boards to

align with the studs. This will help identify stud centres

when xing external cladding systems.

Care must be taken to align the xings with underlying

studs, sole plates and head rails.

Closely butt boards together to reduce cold spots and

use off-cuts, removed from window and door openings,

to ll in around waist rails.

Install horizontal cavity barriers, usually in the form of

mineral wool sausages, mounted on the surface of the

tuff-R Zero board at all intermediate oors.

Apply vertical and horizontal cavity barriers in a similar

fashion around window and door openings.

On gable ends, extend the tuff-R Zero sheathing board

to the underside of the gable ladder.

However, if horizontal loft insulation is to be installed,

the sheathing boards can be terminated at top storey

level ensuring that the top edge of the board is at least

250mm above the nished level of the loft insulation.

Protect all top edges of tuff-R Zero at gable ends with

cavity trays.

Brick cladding

Brickwork should be tied back to the timber framing using

Heli x or similar helical stainless steel wall ties, driven

through the tuff-R Zero into the studs.

Insert ties approx 10 mm to 20 mm above brick course

so that a slight crank can be applied. This ensures the

tie slopes downward from the sheathing to the outer

brickwork.

Tile hanging

Ensure the timber frame is correctly braced to support the

weight of tile hanging.

Apply vertical preservative treated softwood timber

battens over the face of tuff-R Zero sheathing boards,

secured into each underlying stud by means of Heli x

Inskew fasteners.

Tilting llets should be applied at horizontal junctions to

suit design requirements.

Fit a breather membrane horizontally with minimum 100

mm laps, to the surface of the battens, and nail tile battens

to vertical battens to suit tile gauge.

Apply vertical dpcs at all junctions and hang tiles in

accordance with manufacturers instructions.

Other cladding

Lightweight claddings such as PVC-u, timber and

aluminium can be xed to vertical battens utilising a

breather membrane as previously described.

Render nishes require rigid metal lathing xed to the

vertical battens.

Timber frame wall sheathing

3

Technical Services: T 01473 820888 F 01473 820889 E [email protected] W www.celotex.co.uk

Speci cation

Min. U-value required 0.35 W/mK 0.3 W/mK 0.27 W/mK

Celotex tuff-R Zero GA3012Z GA3025Z GA3030Z

Thickness 12 mm 25 mm 30 mm

Visit www.celotex.co.uk for latest information and regional variations.

Calculations

Construction type

Element Wall (timber frame internal lining)




Construction

Thickness Thermal Thermal Pitch and (mm) conductivity resistance Bridge Details (W/mK) (mK/W)


Brick 103.0 0.770 0.134 17.2% mortar (103 mm)


Plywood 9.0 0.143 0.063

Mineral wool 89.0 0.040 2.225 15% timber (89 mm)




U-value - 0.35 W/mK






Installation guidelines (timber frame wall lining)

Fit mineral wool insulation batts between all studs.

Make sure all studs and rails are level with no projections,

and that services are correctly installed.

Measure the height from oor to underside of ceiling

joists. Plan to link seamlessly with oor perimeter

insulation.

Cut board length to suit (sheet size 1200 x 2400 mm)

using a sharp knife or ne-tooth saw.

Cut boards for in ll panels, using off-cuts where possible,

making sure there are no gaps at wall abutments.

Tightly butt board edges together making sure there are

no gaps in the system.

Temporarily secure the boards with clout nails at

600 mm centres. Mark stud lines on board surface as

xing guides for dry lining.

Always x back to solid timber both at stud lines and top

and bottom rails.

Ensure that all board surfaces are clean and free from

dust and then apply aluminium foil vapour-seal tape

to all joints. Rub the surface of the tape well on to the

boards, eliminating air bubbles.

Seal around penetrations for electrical outlets and

switch boxes.

Fix plasterboard lining over the tuff-R Zero GA3000Z

using plasterboard nails or screws of appropriate length

and joint or skim to desired nish.

No separate vapour check membrane is required in this

application the Celotex tuff-R Zero GA3000Z acts as

an ef cient internal vapour control layer.

Timber frame wall lining

4

Timber frame wall sheathing

Timber frame construction is generally recognised as a cost-effective

means of achieving energy ef cient homes. It may be constructed by

the stick-build method favoured in the USA, or the prefabricated

panel method preferred in the UK and elsewhere in Europe.

In either case, thermal insulation has traditionally been

achieved by tting insulating material between vertical timber

studs, with a dry lining of gypsum wallboard. An external sheathing

of plywood or breboard nailed to the faces of the studs provides

resistance to racking.

However, it is now widely recognised that, in highly insulated

framed structures, the thermal bridging effect of the timber frame

itself becomes signi cant. Solid timber, in the form of studs, lintels,

head rails and sole plates, as well as intermediate oor joists and

trimmers, usually accounts for more than 20% of the external

surface area of the building. Therefore, often less than 80% is

actually insulated.

This effect, measured as the framing factor, signi cantly increases

the calculated U-value.

Ignoring the framing factor, a simple calculation of the U-value of a

timber frame panel with brick cladding and lled with mineral wool

will produce a result of 0.35 W/mK.

However, when the framing factor is introduced into the above

calculation, the system barely achieves a value of 0.45 W /mK.

ln fact, smaller dwellings, such as semi-detached and terraced

houses, are often unable to achieve the required U-value because

the framing factor can be as high as 25-26%.

As demand for higher standards of insulation grows, the space

between the studs becomes the limiting factor; the timber itself acts

as a thermal bridge, and the cost of increasing timber sizes to allow

more insulation to be added is disproportionate to the improvement

achieved.

Externally applied insulating sheathing covers the entire opaque

surface of the frame with insulation. This is much thinner, allows

the voids between studs to be free for services, and eliminates

interstitial condensation risk within the frame completely. No

internal vapour check is necessary.

The insulating sheathing approach, because of its ability to

eliminate thermal bridging, has now been universally adopted for

steel stud framing systems.

Design considerations

Timber frame wall lining

Whilst external sheathing is the most ef cient form of insulation

for timber stud framing, it is not always necessary. Celotex also

offers an alternative solution which combines the continued use of

mineral wool batts tted between the studs with an internal lining of

Celotex tuff-R Zero board tted before dry lining. The foil facings of

the tuff-R Zero board, when joints are sealed with an appropriate

foil tape, effectively perform the role of an internal vapour check.

This method also covers the majority of the timber framing, thereby

addressing the thermal bridging issue. However intermediate oor

zones remain uninsulated. We recommend that off-cuts of Celotex

tuff-R Zero should be cut to t between oor joists to reduce heat

losses through the header and trimmer joists at external walls.

Condensation risk at window and door reveals can be eliminated by

using a lining of 12 mm Celotex tuff-R Zero (GA3012Z).

See Limiting Thermal Bridging and Air Leakage: Robust construction

details for dwellings and similar buildings ISBN 0 11 753 6318,

published by HMSO.

Technical Services: T 01473 820888 F 01473 820889 E [email protected] W www.celotex.co.uk5

Characteristics, properties or performance of materials described herein are derived from data obtained under controlled test conditions. Celotex Limited makes no warranty, express or implied as to their characteristics under any variations from such conditions in actual constructions.

Typical details shown in this catalogue are provided for guidance only and are not to scale. Celotex Limited makes no warranty, express or implied as to the suitability of such details for any particular project. It is the responsibility of the designer to ensure that any design or construction details used are suitable for the project, having due regard to the environmental and structural factors which are beyond the control of Celotex Limited.

Not withstanding the foregoing, nothing herein stated shall exclude or restrict:

1 the liability of Celotex Limited in respect of death or personal injury pursuant to the relevant provisions of the Unfair Contract Terms Act 1977, or

2 the liability of Celotex Limited in respect of any damage caused by a defect to the extent that such comes within the relevant provisions of the Consumer Protection Act 1987.

Storage and handling

Celotex tuff-R Zero GA3000Z rigid polyisocyanurate

foam roof boards should be stored dry and kept at

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 the boards.

Care should also be taken to ensure that packs are not

dropped onto corners or edges.

When cutting the product on site, use a trimming knife

rather than a saw, to minimise dust.

When sawing in an enclosed space, dust extraction,

eye protection and face masks must be provided. Dust

or particles in the eyes should be washed out with

liberal quantities of water.

Health and safety

Full guidance on the appropriate measures to be taken by

an employer in accordance with the COSHH Regulations is

provided in Celotex Health and Safety Data Sheets

Quality and technology

Product and application development has a priority in

Celotex, with a focus on high performance, durability

and buildability. The Celotex commitment to the highest

standards of quality assurance includes stringent testing

of product performance by our own quality assurance

staff and by leading independent authorities, both in

Britain and Europe. Copies of certi cates are available

on request.

CE marking

Celotex products are CE marked, demonstrating their full

compliance with BS EN 13165: 2001 the harmonised

European standard that applies to factory made rigid

foam insulation products.

Speci cation

Use NBS Plus speci cation writer clause K11.

Celotex LimitedLady Lane Industrial Estate Hadleigh Ipswich Suffolk IP7 6BAT 01473 822093 F 01473 820880 E [email protected] W www.celotex.co.uk

6

C024/11-03

Celotex tuff-R Zero GA3000Z product description

Celotex tuff-R Zero GA3000Z is a low density rigid

polyisocyanurate (PIR) foam board with a tri-laminate foil/

kraft paper/foil facing on each side.

We recommend tuff-R Zero GA3000Z as suitable for

timber frame wall insulation. As it is extremely versatile and

is also suitable for insulating solid masonry walls, as well

as roofs and oors.

GA3000Z is offered in a range of thicknesses, which are

determined by the thermal resistances (R-values) needed

to achieve the various U-values required by National

Building Regulations and Standards.

Features of Celotex tuff-R Zero GA3000Z boards

low thermal conductivity

zero Ozone Depletion Potential

resistant to high temperatures

foil facings for low surface emissivity

excellent dimensional stability

high standard of airtightnesspr

robust and durable material

non-hygroscopic

easy to cut to shape

conforms to BS EN 13165: 2001

quality assured to ISO 9001:2000

BBA certi cate

BBA certi cation

Celotex tuff-R Zero GA3000Z is extremely versatile and

can be used in oors and roofs as well as walls. British

Board of Agrment certi cate No. 95/3197 covers the use of

GA3000Z in all three applications.

Certi cate No. 95/3197

Product thickness table

Product code Thickness R-value Weight (mm) (kg/m)

GA3012Z 12 0.50 0.60

GA3020Z 20 0.85 0.75

GA3025Z 25 1.05 0.90

GA3030Z 30 1.30 1.00

GA3035Z 35 1.50 1.10

GA3040Z 40 1.70 1.25

GA3045Z 45 1.95 1.45

GA3050Z 50 2.15 1.60

GA3055Z 55 2.35 1.80

GA3060Z 60 2.60 1.90

GA3065Z 65 2.80 2.00

GA3070Z 70 3.00 2.10

GA3075Z 75 3.25 2.20

GA3080Z 80 3.45 2.30

GA3090Z 90 3.90 2.50

Celotex tuff-R Zero GA3000Z physical properties

Units Test method GA3000Z Notes

Mechanical

Density (foam core) kg/m BS EN 1602 26 - 32 Varies according to thickness

Compressive strength kPa BS EN 826: 1996 > 120 Design value

Water

Water vapour resistivity MNs/gm BS 4370: Part 2 43373 As measured on 25mm board thickness

Heat

Thermal conductivity (D) W/mK BS EN 12667: 0.023 Declared value 2001 harmonised standard

Service temperature C Min. and Max. -15 to +100

Fire

Reaction to re BS EN 13823 Class D/s2/d0

Surface spread of ame BS 476: Part 7 Class 1

Board dimensions

GA3000Z is available in 2400 x 1200 mm board sizes and has grid markings at 100 mm intervals to assist laying.

Technical Services: T 01473 820888 F 01473 820889 E [email protected] W www.celotex.co.uk2

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Celotex SOL_TFW Insulation