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Celotex SOL_TFW Insulation
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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)
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 55.0 0.023 2.350 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 - 0.29 W/mK
U-value: Combined method: 0.29 W/mK
(lower limit = 3.438 mK/W, upper limit = 3.483 mK/W, dUf 0.00, dUg 0.00).
Correction for mechanical fasteners, Delta Uf = 0.000 W/mK.
Correction for air gaps, Delta Ug = 0.000 W/mK.
(Based on the combined method for determining U-values of structures containing repeating thermal bridges).
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)
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
Plywood 9.0 0.143 0.063
Mineral wool 89.0 0.040 2.225 15% timber (89 mm)
Celotex tuff-R Zero GA3000Z 12.0 0.023 0.500 delta U = 0.01
Gypsum Wallboard 12.5 0.160 0.080
Inside surface resistance 0.130
U-value - 0.35 W/mK
U-value: Combined method: 0.35 W/mK
(lower limit = 2.790 mK/W, upper limit = 2.792 mK/W, dUf 0.00, dUg 0.00).
Correction for mechanical fasteners, Delta Uf = 0.000 W/mK.
Correction for air gaps, Delta Ug = 0.000 W/mK.
(Based on the combined method for determining U-values of structures containing repeating thermal bridges).
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