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Marley Eternit Fibre Cement Sheet Roofing from Steadmans is recognised as a superior alternative to asbestos cement roofing and is:

  • Highly cost effective weatherproofing
  • An environmentally friendly asbestos-free, reinforced fibre cement sheet
  • Virtually maintenance free
  • Resistant to chemical attack, rust, rot and corrosion
  • Non-toxic
  • Available in a range of painted colours
  • Manufactured to meet British and European building standards
  • BBA approved

Application

Fibre Cement Sheet Roofing sheets are utilised in an extensive range of situations, they are widely used within industrial and agricultural buildings. Steadmans are distributors of AS6 and AS3 profiles from Marley Eternit, the Country’s largest manufacturer of fibre cement products and the producers of profiled sheeting for over 90 years. The products are differentiated by the size of corrugation in the sheets; the AS3 profile having smaller corrugations than the AS6 profile. Both types of Fibre Cement Sheet Roofing sheets are manufactured from a selected blend of Portland cement and water. This is reinforced with a mixture of both natural and synthetic fibres.

The longevity of this formulation has enabled a 30 year guarantee on sheets and fittings to be offered (available on request). Building upon years of experience in the UK roofing industry, our manufacturer has developed a purpose designed, reinforced fibre cement sheet – AS6 – that meets the high standards of safety in roofing work set out in the Health and Safety Executive document ‘Health and Safety in Roof Work’ (HSG 33). In addition to the AS6 sheet, we are proud to be able to offer a complementary range of accessories that meet the same high standards of safety.

Marley Eternit Fibre Cement Sheet Roofing from Steadmans is recognised as a superior alternative to asbestos cement roofing and is:

  • Highly cost effective weatherproofing
  • An environmentally friendly asbestos-free, reinforced fibre content sheet
  • Virtually maintenance free
  • Resistant to chemical attack, rust, rot and corrosion
  • Non-toxic
  • Available in a range of painted colours
  • Manufactured to meet British and European building standards
  • BBA approved

In addition, the fibre cement profile sheeting:

  • Requires no special precautions
  • Has excellent noise and thermal insulation properties
  • Is available with 30 year guarantee (on request)

marley eternit logo

Requirements

Marley Eternit Fibre Cement Sheet Roofing from Steadmans is manufactured in accordance with a quality system registered under BS EN ISO 9001. They also hold British Board of Agrément Certificate No. 00/3700.

BBAlogo003700  marley eternit logo

Marley Eternit 30 Year Guarantee

Marley Eternit profiled sheeting bought from Steadmans or any other SIG operating company.

SIG Trading Ltd or any of its associated fully owned trading companies, such as Steadmans, do not offer a Guarantee or Warranty on Marley Eternit profiled sheeting. However it is possible for client and contractor to obtain a 30 year Guarantee from the manufacture upon direct request to them. The provision of this guarantee however is subject to a number of conditions all of which are contained within the terms of any issued Guarantee. There are specific references to the following requirements associated with the product installation, the aim of which is to ensure a satisfactory result for all parties.

i) Marley Eternit must be contacted prior to construction with project details and the client and installer must agree that installation is carried out in accordance with Marley Eternit recommendations and all relevant Standards.

ii) If agreed a guarantee will be supplied specific to both the client and property.

iii) This document must be retained and produced in the event of any future claim.

SIG may be required from time to time to facilitate the above on behalf of the client, contractor or manufacture. In doing so it does not hold itself liable to any terms contained within the Guarantee or any collateral agreements made between the manufacture, installer or client. SIG terms and conditions apply at all times.

Marley Eternit guarantee that the products themselves (excluding any colour applied by us to the products (‘the Colour Application’) will be manufactured to the appropriate standard and will be free from defects in materials and workmanship for a period of 30 years from the date of delivery of the last installment of them to you or the Contractor (‘Period 1’).
Whilst a durable colour coating is applied, the following should be noted – the colour intensity will reduce due to weathering as described in BS EN 494: 2004 section 5.1.2 ‘Appearance and Finish’, and when the roof is viewed from a reasonable distance, the colour intensity of the Colour Application will appear harmonious.

References

  • Approved Documents
    • A Structure
    • B Fire safety
    • C Site preparation and resistance to contaminants and moisture.
    • L2A Conservation of fuel and power in new buildings other than dwellings.
    • L2B Conservation of fuel and power in existing buildings other than dwellings.
  • The Scottish Building Standards: Technical Handbook.
    • Non-domestic.
  • BS 476 Fire tests on building material and structures.
    • BS 476-3:2004 Classification and method of test for external fire exposure to roofs.
    • BS 476-7:1997 Method of test to determine the classification of the surface spread of flame of products.
    • BS 476-22:1987 Methods for determination of the fire resistance of non-loadbearing elements of construction.
  • BS 5250:2002 Code of practice for control of condensation in buildings.
  • BS 5950 Structural use of steelwork in building.
    • BS 5950-2:2001 Specification for materials, fabrication and erection. Rolled and welded sections.
  • BS 8206 Lighting for buildings.
    • BS 8206-2:1992 Code of practice for daylighting.
  • BS EN 12056 Gravity drainage systems inside buildings.
    • BS EN 12056-3:2000 Roof drainage, layout and calculation.
  • BS EN ISO 10211 Thermal bridges in building construction. Heat flows and surface temperatures.
    • BS EN ISO 10211:2007 Detailed calculations.
  • BS EN ISO 13788:2002 Hygrothermal performance of building components and building elements. Internal surface temperature to avoid critical surface humidity and interstitial condensation. Calculation methods.
  • TM 37: Design for improved solar shading. 2006

Performance

Impact resistance

The test for fragility of roofing assemblies’ ACR (M) 001: 2005 consists of a 45kg bag being dropped from a height of 1200mm onto a fixed sample of roofing. It is intended to provide information about whether the roof can support the instantaneous loads imposed on it by persons stumbling or falling onto it. A roof is classified as fragile if the bag passes through the roof assembly.

If the bag is retained on the test assembly and no other drop tests are carried out, the assembly shall be classified as Class C non-fragile assembly. AS6 sheets meet this requirement.

Sound insulation

When tested in the critical frequency range of 100-3150Hz, the profiled sheeting achieves the following mean airborne sound reduction:

  • AS6 & Farmscape single skin 26 decibels
Breaking strength

The minimum breaking strength for fibre cement sheets is defined under BS EN 494.

AS3

The minimum lengthways breaking load is 1400N/m whilst the minimum transverse bending moment at rupture is 40Nm/m.

AS6 & Farmscape

The minimum against grain breaking load (purlin to purlin) for is 4250N/m. The minimum with grain bending moment at rupture (ridge to ridge) for is 55Nm/m.

Density

Minimum density for AS3 is 1400kg/m³ in accordance with BS EN 494.

Installed weight

The approximate installed dry weight of single and double skin profiled sheeting with fixings and the required side and end lap is as follows:

  • AS3 single skin approx. 14.5kg/m². This includes fixings, 150mm end lap and 131.2mm side lap.
  • AS6 & Farmscape single skin 17.0kg/m²
Fire

External fire exposure: the sheets have a P60 (external SAA) rating to BS 476-3:2004, and can be classified Class 0 in accordance with the Building Regulations.

Water tightness

Fibre cement complies with BS EN 494: Clause 5.3.4.

Water absorption

Average water absorption +25% of dry weight after complete immersion for 24 hours.

Moisture content

When new, fibre cement sheeting has a relatively high moisture content. If humid conditions prevail, damp patches (without formulation of droplets) may appear on the underside of the sheets. This phenomenon is in no way detrimental to performance, and will disappear within 12 months, in the course of natural exposure.

Condensation

In the absence of proper ventilation, water droplets may condense on the underside of the sheeting, especially on cold, clear nights when the roof radiates heat to the sky. Whilst not harmful, the effect is undesirable and adequate ventilation should be provided.

Effects of chemicals

Over the years chemical and industrial atmospheric pollution will cause a slight softening of the surface of natural finish fibre cement sheets. The acrylic paint finish provides added protection against many acids, alkalis and solvents normally found in the atmosphere.

The polyester/alkyd finish to the metal liner tray is corrosion resistant in normal industrial atmospheres. However, in more aggressive environments, a fibre cement liner tray is recommended. Where fibre cement is to be used in particularly aggressive atmospheres, with higher than normal concentrations of acids, alkalis, fats or salts, please contact the Technical Department for advice.

Biological

All the profiled sheets are vermin and rot-resistant, but lichen may grow on the outer surface. For advice on removal, please contact the Technical Department.

Effects of low and high temperature

The profiled sheeting is designed to be minimally affected by frost or climatic temperature changes.

For buildings in which higher than normal temperatures occur, or in areas which are expected to be subjected to sudden changes in temperature, special considerations may be necessary. (Consult the Technical Department for recommendations).

Thermal and other movements

The amount of movement is negligible, but it is necessary to provide movement joints in association with the structural framework. The co-efficient of linear expansion for profiled sheeting is 8 × 10-6m/mK.

Thermal conductivity

The profiled sheeting has only low thermal conductivity when compared with other sheet roofing products. This serves to reduce heat build up in summer and heat loss in winter.

Thermal conductivity (k) = 0.48W/mK.

Thermal transmittance (U value)

When constructed as detailed in this compendium, all insulated systems will exceed a U value of 0.25W/m²K. (This is the standard U-value required by Building Regulations Approved Document L2 for roofs with integral insulation on buildings other than dwellings.)

Durability

The profiled sheeting may be regarded as having a normal life of at least 50 years, but the durability of the fixing accessories should be taken into account.
Atmospheric pollution is not normally sufficiently concentrated to be harmful. Measures should be taken to prevent corrosion of the fixing accessories, e.g. by the use of plastic washers and caps.

The profiled sheeting is resistant to most forms of atmospheric attack but with age becomes less elastic and a small deflection will be experienced, which may make it less resistant to impact. Its transverse strength, however, is maintained.

Technical

Table 04: Manufacturing tolerances

Length +5 / -10mm
Cover width +8mm / -2mm
Overall width +10mm / -5mm
Thickness +free / 0mm

Table 05: AS3, AS6 & Farmscape Sheet Fixing Details

End lap: 150mm minimum
Side lap: 70mm
Purlins centres 1375mm maximum
Clear span: 1300mm maximum
Rail centres: 1825mm maximum
Span between rails: 1750mm maximum
Unsupported overhang 4000mm maximum

Colours

natural grey
Natural Grey
blue
Blue
Gunmetal Grey
Gunmetal Grey
Laural Green
Laural Grey
brown
Brown
anthracite
Anthracite
serpentine
Serpentine
Bracken
Bracken

Technical

Steadmans are distributors of AS3, AS6 and Farmscape profiles from Marley Eternit, the Country’s largest manufacturer of fibre cement products and the producers of profiled sheeting for over 90 years. The products are differentiated by the size of corrugation in the sheets; the AS3 profile having smaller corrugations than the AS6 and Farmscape profiles.

All the sheets are manufactured from a selected blend of Portland cement and water. This is reinforced with a mixture of both natural and synthetic fibres. The longevity of this formulation has enabled Marley Eternit to offer a 30 year guarantee on our sheets and fittings (available on request).

Marley Eternit have always worked to improve safety when using our range of roofing and cladding products. Building upon over 90 years experience in the UK roofing industry we have developed a purpose designed, reinforced fibre cement sheet – AS6 – that meets the high standards of safety in roofing work set out in the Health and Safety Executive document ‘Health and Safety in Roof Work’ (HSG 33). In addition to the AS6 sheet, we are proud to be able to offer a complementary range of accessories that meet the same high standards of safety.

Which profile?

The decision to use AS3, AS6 or Farmscape sheets will depend largely upon the following four criteria:

  1. The scale of the building in question.
  2. Compatibility with any existing materials.
  3. The distance from centre to centre of the horizontal fixing rails or purlins.
  4. Whether or not the roofing material is to be classified as non-fragile.

Reference should therefore be made to the sheet sizes, fixing details and product data provided before deciding which type of profiled sheeting to use.

AS3

The lower profile of this product makes it particularly suitable for a range of domestic, agricultural and light industrial buildings. It can be laid to a minimum roof pitch of 10°.
AS3

Table 01: AS3 Sheet Sizes

Length of sheet in mm 1525 2440 3050
Length of sheet in feet 5’0″ 8’0″ 10’0″

AS6

AS6 is a high strength fibre cement sheet with polypropylene reinforcement strips inserted along precisely engineered locations which run for the full length of the sheet in each corrugation. This provides maximum reinforcement strength with no loss of durability in service. AS6 can be laid to a minimum roof pitch of 5°.

The cut-away illustration above shows the location of the polypropylene reinforcement strip inserted in a precisely engineered position in each corrugation of the AS6/Farmscape sheet.

ProfileAS6

Table 02: AS6 sheet sizes

AS6 is a high strength fibre cement sheet with polypropylene reinforcement strips inserted along precisely engineered locations which run for the full length of the sheet in each corrugation. This provides maximum reinforcement strength with no loss of durability in service. AS6 can be laid to a minimum roof pitch of 5°.

The cut-away illustration above shows the location of the polypropylene reinforcement strip inserted in a precisely engineered position in each corrugation of the AS6/Farmscape sheet.

profile AS6

Table 02: AS6 Sheet Sizes

Length of sheet in mm 1525 1675 1825 1975 2125 2275 2440 2600 2750 2900 3050
Length of sheet in feet 5’0″ 5’6″ 6’0″ 6’6″ 7’0″ 7’6″ 8’0″ 8’6″ 9’0″ 9’6″ 10’0″
Number of sheets per tonne 46 43 39 36 33 31 29 28 26 25 23
Area of sheet in sq. metres 1.66 1.82 1.99 2.15 2.31 2.48 2.65 2.82 2.98 3.15 3.31

Farmscape

Farmscape uses the AS6 profile and is designed to reduce the visual impact of buildings on the landscape by giving them a more natural look from new. This effect is achieved by applying a surface pigmentation to the top face of the sheet. Unlike a dense layer of gloss paint, this pigmentation allows the distinctive texture of the fibre cement substrate to show through, and gives the product a far more natural appearance than the finish traditionally available to planners and designers.

Farmscape can be laid to a minimum roof pitch of 5°.

Table 03: Farmscape Sheet Sizes

Length of sheet in mm 1525 2440 2900
Length of sheet in feet 5’0″ 8’0″ 9’6″
Number of sheets per tonne 46 29 25
Area of sheet in sq. metres 1.66 2.65 3.15
profile AS6

Construction Details

  • Lay sheet number 1 at the eaves without mitring.
  • Lay sheet number 2, mitring bottom right hand corner as per the illustration opposite.
  • Lay sheet number 3, mitring as per step 2. Continue up the roof slope to complete the first tier.
  • Lay sheet number 4 at the eaves of the next tier, mitring the top left hand corner as per the illustration opposite.
  • Lay sheet number 5, mitring both top left hand and bottom right hand corners as per illustration opposite, and continue up the slope until ready to lay sheet number 6 at the ridge.
  • Lay sheet number 6 at the ridge, mitred as per step 2.
  • Repeat the procedure from and including step 4, working across the roof from eaves to ridge, until there is room for only one more tier to be laid, on the right hand edge.
  • Lay sheet number 7, mitring the top left hand corner. If necessary, reducing the sheet width by cutting down the right hand edge. All subsequent sheets in this final tier should be cut accordingly.
  • Lay sheet number 8 as per step 7, continuing up the roof slope until ready to lay the final sheet at the ridge.
  • Lay sheet number 9 at the ridge without mitring to complete the roof.

mitringguideMitringplans

Supply and Site Handling

Fibre Cement Sheet Roofing is available directly from Steadmans. Fully timber crated packs are available for sea freight shipping at additional cost. Fibre Cement Sheet Roofing is usually delivered to site. Off loading is the responsibility of the customer. Delivery by self off-load vehicles can be arranged.

ONE ORDER • ONE DELIVERY • ONE INVOICE • ONE NUMBER • 01697 478 277

Site Work

Steadmans Fibre Cement Sheet Roofing products are manufactured to a high quality and to comply with British and European standards. It is essential that the products are stored, handled and fixed correctly. It is recommended that roofing, wall sheets and accessories are fitted by experienced contractors. Once the products have been collected or delivered to site, it is the responsibility of the customer, or his agent, to store, handle and protect them.

Handling and Storage
  • The majority of deliveries, via Steadmans, are off-loaded by piggy-back fork-lift. However, subsequent crane handling should be careful to avoid damage to the edges of the sheets. Use rope slings (not chains) and over-width spreaders to eliminate the possibility of damaging the edges of the sheets. The corners of the sheets are particularly vulnerable during any transportation period.
  • Never push, drag or slide a sheet from a stack. Always consciously remove the sheet by lifting from the stack. Similarly, lift the sheet into position on a roof; do not push or drag over the purlins or other roof sheets. If an on-site lift facility is unavailable, each sheet should be carefully removed by hand as described above. Once removed, they should be manoeuvred into position by two men, one at each end. Particular care should be taken in windy conditions.
  • Coloured sheets and accessories should ideally be stored inside a building. Until the sheets are in position on the building they could be subject to damage from site debris, and accidental collision. Rainwater, condensation and extreme weather conditions can also adversely affect the sheets (particularly colour sheets) during this storage period.
  • The sheets are supplied covered in shrink-wrapping. It is strongly recommended that the wrapping is not removed until the sheets are required for fixing. Should any sheets remain unused at the end of the working period, the edges of all the sheets MUST BE RE-COVERED.
  • If it is not possible to store the product inside a building, a suitable site should be selected. The ground should be firm and level and as close to the construction work as possible. The sheets must be stacked on cross bearers, thus raising them off the ground. A simple protective frame should be constructed and covered with a waterproof material. Air must be allowed to circulate all round the stack. The whole frame and stack should be tilted to encourage rainwater to drain freely.
  • NEVER walk on the sheets, whether on the ground, on the stack or fixed on the roof.
  • Stacks without additional timber cross bearers should not exceed 1200mm. Cross bearers should be no more than 1 metre apart. Different length sheets should ideally be stacked separately, but if stacked with longer sheets they must be laid on the top and their cross bearers must line up vertically.
  • If several stacks are to be laid, one on top of the other, timber cross bearers should be place at 500mm intervals up to a maximum height of 3000mm. It is important that the ground is level and firm .
  • Whether the product is stored inside or outside, the stacks should be regularly inspected to ensure that moisture has not penetrated the coverings. Coloured sheets are particularly vulnerable at this stage.
Preparation
  • Before fixing any Fibre Cement Sheet Roofing check the squareness and accuracy of the steelwork. Determine the direction of the prevailing wind. Check sheets for damage before fixing.
Precautions and Procedures
  • It is extremely important that the correct roof purlin/rail system, type of fixings and washers are selected to eliminate leakage/corrosion and the general deterioration of the construction.
  • NEVER hammer fixings through the sheet. This will invalidate the guarantee. Fibre cement sheets will shatter under impact and subsequently allow water to penetrate the apparent fixing. ALWAYS pre-drill.
  • To achieve a watertight and weathertight seal, it is important to confirm that the sealing washer is correctly tightened. Not over tight, not too loose. After a period of time, when the material has settled, the fixings may require retightening with hand-tools. be sure to use roof ladders to avoid walking on the roof sheets.
Fixings

Fibre Cement Sheet Roofing should always be fixed with two fasteners per sheet per purlin. More information of fixings can be found in the Design guidance section or by clicking on the link here.

Using a tungsten carbide tipped drill at 90º angle to the sheet, drill a hole 4mm larger than the selected fixing. The drill point should be no less than 60º to the sheet. Always drill at the ‘apex’ of the rise of the profile. Do not fix a sheet in the ‘valley’ or on a ‘slope’ of the profile.

Laying Procedure
  • To reduce the overlapping of four roof sheets, the corners of two sheets must be mitred. Each mitre must be cut straight and cleanly either by hand or powersaw. The angle and size of mitre is governed by the profile of the sheet and the end and side lap dimensions. It is recommended that a good quality butyl mastic strip is involved in the joining of the overlapping sheets to provide a weathertight seal.

Installation Guidance

Structure

AS6 sheets are designed to be supported by and fixed to steel or timber purlins. Steelwork for AS6 sheets should be within the tolerances given in BS 5950-2:2001: fixing planes on adjacent purlins should be less than L/600 apart (where L is the purlin spacing). All AS6 sheets are suitable for spanning purlins at 1.8m centres. Consult Steadmans Technical Department for guidance on using the panels on purlins at centres greater than 1.8m. AS6 sheets should be isolated from preservative treated timber purlins by PVC barrier tape applied to the bearing face of the purlins.

Fixings

When fixing AS6 on roof slopes up to 30° (double skin up to 15°) we recommend the use of topfix fasteners from SFS Stadler Limited. These fasteners provide a quick and effective one step fixing operation. However, they must be installed using the recommended depth locating power tool to prevent under or over tightening, which can damage the roof sheets.

When topfix fasteners are not used, the recommended fastener diameter is 8mm, which requires a clearance hole of 8mm + 2mm = 10mm. If using drive screws, the holes should be located centrally on the timber purlins; for hook bolts or similar the hole should be located 4mm upslope from the back edge of the purlin. 6mm diameter fasteners can be used for AS3.

Note: In all instances the Sela washers and protective caps manufactured by SFS Stadler Ltd should be utilised to ensure adequate weather protection.

Checking the topfix fasteners for tightness

Checking the topfix fasteners for tightness

Steadmans stock a range of fixings for their fibre cement products. Hook and crook bolts are commonly used to secure the sheets. Clearance holes 4mm larger than the fixing should be pre-drilled to accept the fixing. The appropriate washer must be used to seal the operation.
For normal exposure conditions AS6 should always be fixed with two fasteners per sheet per purlin: consult Steadmans Technical Department for guidance on abnormal conditions.

Overhangs

Sufficient overhangs must be allowed at the eaves to ensure that rainwater discharges into the gutter. Verges must be overhung by one complete corrugation unless a bargeboard is used.

overhangs

Side Laps

Side Laps

Sealing

Where appropriate, 8mm diameter butyl strips should be positioned as shown.

butyl-strip

AS3 profile sealing side lap sealing

8mm-butyl-strip

AS6/Firesmart profile side lap sealing

End Laps

The minimum end lap for either AS3 or AS6/Farmscape is 150mm, fixed as shown in the section below. Where double sealing is necessary, the second butyl strip should be positioned 100 – 200mm below the fixing.
Lap Detail

Maintenance

Annual Inspection

It is good practice to carry out annual inspection of the building exterior and to carry out any remedial work identified during the inspection, see table 06.

Note: Never walk on the sheets, whether on the ground, on the stack or fixed on the roof.

Painting

NEVER paint fibre cement products. The guarantee will be invalidated if the product is painted after it has left Steadmans’ warehouse.

Table 06 Checklist for annual inspection
Check For Remedial Action
Blocked gutters, which may cause overflow into the building. Clean gutters and wash out any blockage.
Build-up of debris, which can retain water and cause corrosion. Remove debris.
Dirt retention on areas not washed by rainwater: that affects the appearance of the building and, if left untreated, could cause the coating to breakdown. Wash down with fresh water using a hose and soft bristle brush. Heavy deposits can be removed with a solution of water and household detergent or proprietary cleaner.
Mould growth, which is rare, but can affect the appearance of the building. Wash down, then apply a cleansing solution: consult Steadmans Technical Department for guidance.
Local damage – breakthrough of the panel coating could result in corrosion of the substrate. Assess the extent of the damage and either touch up (see opposite) or overpaint the affected area or replace damaged sheets.
Drilling swarf and fixing debris. Remove debris.
Condition of fixings – faulty fixings can cause leaks or rust staining on the surface of the panels. Replace faulty fixings and missing clips.

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