Jutland slate
Jutland is an attractive flat, square edged fibre cement slate that is manufactured to the highest European standards. Jutland slates are lightweight, pre-holed, suitable for all types of projects, easy to handle and install, durable and an economic alternative to natural roofing materials.
Jutland slates are manufactured using portland cement together with a non-asbestos formulation of superior blended synthetic and cellulose fibres. Jutland slates are pigmented during production and are fully compressed. They are finished with a high quality, semi-matt acrylic coating to both faces and all edges.
Quality assurance
Jutland slates are manufactured in accordance with a quality assurance system to ISO 9001 and
to the requirements of BS EN 492 product specification for fibre cement slates and their fittings. Jutland slate has been awarded the British Board of Agrément certificate 03/4041.
They have been tested by Birmingham City Laboratories and approved for use on Birmingham City Council projects and accepted by many other local authorities.
Colours
Jutland slate is available in Graphite Blue/Black,
Russet and Autumn Brown.
Performance
Compatibility
Jutland slates are compatible with most common building materials, except those
vulnerable to alkaline attack. When materials such as aluminium are used as flashings or gutters they should be protected and maintained with bituminous paint where they are
subject to water run-off from the slates.
Tolerances
Jutland slates are made to the following dimensional tolerances in accordance with BS EN 492: 1994.
Length or width: ± 3.0 mm Thickness: + 1.0 mm, – 0.4 mm
Strength Jutland slates exceed the requirements of Class B (the highest) of BS EN 492
giving an average bending moment greater than 50 Nn/m.
Density
Jutland slates have a minimum density of 1700 kg/m3 when tested to
BS 4625: Section 14 and to BS EN 492 section 7.3.1.
Fire
Jutland slates achieve the following ratings:
BS 476: Part 2: 1989 and BS 476: Part 7: 1987. Fire Propagation Index (I) of 0.9, a Sub index (ii) of 0.3 and a Class 1 surface.
Class O surface as defined in the various national Building Regulations.
BS 476: Part 3 1958 EXT. SAA
BS 476: Part 3 1975 Class P60
Frost
Jutland slates show satisfactory frost resistance after 100 freeze/thaw cycles when
tested to BS 4625: Section 14 and satisfy the requirements of BS EN 492 section 7.4.1.
Thermal
The coefficient of linear expansion of Jutland slates is approximately 8
´ 10-6 mm/°C.
This is equivalent to an expansion of 0.08 mm/m for a 10°C temperature change.
Thermal conductivity: (k value) is 0.35W/m°C.
Effects of chemicals
During tests Jutland slates have been found to have a good resistance to chemical attack, however it should be noted that prolonged exposure will cause surface degradation.
In areas where this may be excessive please consult Cembrit for further advice.
Biological
Jutland slates are vermin and rot proof. The acrylic coating of the slates will reduce the potential growth of moss and lichen.
General design considerations
Jutland slates laid to BS 5534 will meet the strength requirements for the imposed and uniformly distributed wind and snow loads etc. The site exposure rating and the pitch of roof rafters will determine the size, pattern, lap and fixings for the slates. For UK and Northern Ireland locations,
BS 5534: 2003 will indicate the expected degree of exposure. Wind driven rain ratings less than
56.5 l/m2 per spell are described as ‘moderate’ (see table 1) and those above 56.5 l/m2 per spell are described as ‘severe’ (see table 2). Detailed guidance on wind load calculations is given in
BS 5534 and in BS 6399: all parts. In locations where abnormal conditions may be anticipated
such as elevated sites, coastal locations areas of heavy snowfall etc., the recommendation for ‘severe’ should be followed. Additional information can also be found in BS 8104.
Table 1
Moderate exposure
less than 56.5 l/m2 per spell
|
Pitch |
Slate
size |
Minimum
headlap |
Slates |
Batten
gauge |
Average
weight |
|
deg |
mm ´ mm |
mm |
no/m2 |
mm |
kg/m2 |
|
45° |
600 ´ 300 |
90 |
13.07 |
255 |
19.61 |
| |
500 ´ 250 |
90 |
19.51 |
205 |
20.29 |
| |
400 ´ 240 |
80 |
26.04 |
160 |
17.45 |
|
40° |
600 ´ 300 |
90 |
13.07 |
255 |
19.61 |
| |
500 ´ 250 |
90 |
19.51 |
205 |
20.29 |
| |
400 ´ 240 |
80 |
26.04 |
160 |
17.45 |
|
35° |
600 ´ 300 |
90 |
13.07 |
255 |
19.61 |
| |
500 ´ 250 |
90 |
19.51 |
205 |
20.29 |
| |
400 ´ 240 |
80 |
26.04 |
160 |
17.45 |
|
30° |
600 ´ 300 |
90 |
13.07 |
255 |
19.61 |
| |
500 ´ 250 |
90 |
19.51 |
205 |
20.29 |
| |
400 ´ 240 |
80 |
26.04 |
160 |
17.45 |
|
27.5° |
600 ´ 300 |
100 |
13.33 |
250 |
20.00 |
| |
500 ´ 250 |
100 |
20.00 |
200 |
20.80 |
|
25° |
600 ´ 300 |
100 |
13.33 |
250 |
20.00 |
| |
500 ´ 250 |
100 |
20.00 |
200 |
20.80 |
|
22.5° |
600 ´ 300 |
100 |
13.33 |
250 |
20.00 |
| |
500 ´ 250 |
110 |
20.51 |
195 |
21.33 |
|
20° |
600 ´ 300 |
110 |
13.61 |
245 |
20.41 |
Table 2
Severe exposure
greater than or equal to 56.5 l/m2 per spell
|
Pitch |
Slate
size |
Minimum
headlap |
Slates |
Batten
gauge |
Average
weight |
|
deg |
mm ´ mm |
mm |
no/m2 |
mm |
kg/m2 |
|
45° |
600 ´ 300 |
90 |
13.07 |
255 |
19.61 |
| |
500 ´ 250 |
90 |
19.51 |
205 |
20.29 |
| |
400 ´ 240 |
80 |
26.04 |
160 |
17.45 |
|
40° |
600 x 300 |
90 |
13.07 |
255 |
19.61 |
| |
500 ´ 250 |
90 |
19.51 |
205 |
20.29 |
| |
400 ´ 240 |
90 |
26.88 |
155 |
18.01 |
|
35° |
600 ´ 300 |
90 |
13.07 |
255 |
19.61 |
| |
500 ´ 250 |
90 |
19.51 |
205 |
20.29 |
| |
400 ´ 240 |
100 |
27.78 |
150 |
18.61 |
|
30° |
600 ´ 300 |
100 |
13.33 |
250 |
20.00 |
| |
500 ´ 250 |
100 |
20.00 |
200 |
20.80 |
| |
400 ´ 240 |
100 |
27.78 |
150 |
18.61 |
|
27.5° |
600 ´ 300 |
100 |
13.33 |
250 |
20.00 |
| |
500 ´ 250 |
110 |
20.51 |
195 |
21.33 |
|
25° |
600 ´ 300 |
110 |
13.61 |
245 |
20.41 |
|
22.5° |
600 ´ 300 |
110 |
13.61 |
245 |
20.41 |
|
20° |
600 ´ 300 |
110 |
13.61 |
245 |
20.41 |
Table 3
Technical specification
|
Size |
Holed |
Weight per 1000 |
No. per Pallet |
Colour |
|
mm |
mm |
kg |
|
|
|
600 ´ 300 |
90–110 lap |
1500 |
1000 |
Graphite |
|
600 ´ 300 |
90–110 lap |
1500 |
1000 |
Blue Black |
|
600 ´ 300 |
90–110 lap |
1500 |
1000 |
Russet |
|
600 ´ 300 |
90–110 lap |
1500 |
1000 |
Autumn Brown |
|
500 ´ 250 |
90–110 lap |
1040 |
1600 |
Blue Black |
|
500 ´ 250 |
90–110 lap |
1040 |
1600 |
Graphite |
|
400 ´ 240 |
80–100 lap |
670 |
1800 |
Blue Black |
|
|
|
|
|
|
|
Identification
A minimum of 25% of the slates are marked on the underside using the following format: BB104200NTB2
Where the first character denotes the factory of origin; the second character the Strength Classification from EN 492 section 7.3.2; the next six numbers denote the shift and year of manufacture; NT denotes non-asbestos technology; and the final two characters show the
production line and painting line used for manufacture.
Supply
All Cembrit ’s products are supplied directly to approved accounts, roofing contractors and builders’ merchants. Jutland slates are delivered on wooden pallets, either banded or fully encased in cardboard and shrink wrapped. Prices are available on request from Cembrit Ltd.
Sitework
Storage
Jutland slates should not be allowed to become wet during storage as this may cause efflorescence staining as a result of water accumulating between the slates surfaces.
If stored outside for short periods, the polythene hood should be removed and the slates open stacked and covered with a tarpaulin.
Working
Jutland slate can be cut using the traditional method of scribing and breaking over a
straight edge. Angle grinders are not recommended due to nuisance dust levels.
Additional fixing holes should be drilled using a 4.5mm drill bit. Holes should not be less
than 20 mm from the edge of the slate. After cutting or drilling remove all dust from the
slate to avoid possible staining.
Fixing
Slates must be laid in accordance with the Code of Practice for Slating and Tiling,
BS 5534: 2003, and the Code of Practice for Workmanship on Building Sites – Slating and Tiling, BS 8000: Part 6: 1990. The method of fixing is to centre nail each slate with two
2.65 mm
´ 30 mm long copper nails and secure the tail of the slate with a copper disk
rivet of suitable quality.
Slates should be laid with a broken bond and a gap of 3-5mm between slates. Slate and
a half and double sized slates should be drilled to accept 3 nails and 2 disc rivets. The roof
space and/or batten cavity must be ventilated in accordance with the latest edition of
BS5250: 2002. Particular attention should be given to the need for adequate ventilation
where the insulation follows the rafter line.
Further details are available from our Technical Department.
Battens
Minimum batten sizes as recommended in BS 5534: 2003 for pitched roofs and vertical cladding:
| Span (mm) |
Batten size (mm) |
| 450 |
38 ´ 25 |
| 600 |
50 ´ 25 |
To avoid splitting the batten, the maximum nail diameter should not exceed one tenth of
the batten width. The roof should always be set out so that the long edges of the slates
are parallel to the direction at which the water will run off the roof. In some instances this may result in raking all the eaves and the ridge. The ends of any batten should be fully supported and the length of any batten should not be less than 1.2 m (except where this
is unavoidable) and nailed to a maximum of 600 mm centres. Where the roof is close-boarded, counter battens should be used down the slope in the roof on the line of the
rafters. Counter battens should be at least 38 mm wide
´ 12 mm deep and, where impermeable underlay is specified, of sufficient thickness to provide ventilation between
the boarding and underlay.
Underlay
Suitable underlay should have a minimum standard to BS 747:2000 and/or
should have a British Board of Agrément Certificate. The underlay should be draped over
the rafters, or fully supported on boarding or sheathing, should allow any moisture to
drain and should extend over the tilting fillet, fascia board and into the eaves gutter.
Lead staining risk
Lead develops a lead carbonate patina which, if washed over slates by rain or other
moisture, causes unsightly staining. To prevent this reaction marring the work, it is
advisable to treat all lead including soakers and flashings, with patination oil before any
rain occurs, and not later than the day the lead is fixed. Patination oil, a low viscosity fluid intended for this purpose, should be applied evenly. It is readily available from builders merchants.
Technical services
For assistance with all aspects of the specification and application of any of our products, please contact Cembrit Head Office.
Typical specification
Roof to be covered with Jutland slates, size ....... mm
´ ....... mm, laid to a minimum head lap of ....... mm. 
