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Steadmans’  AS Single-Skin Steel Cladding roof and wall systems consist of coated steel sheets rolled to five different profiles; they may be used to form roofs – down to 4 degree pitch (6 degree if rooflights and required) and walls. The systems includes a comprehensive range of fixings, sealants, guttering, flashings and rooflights.

The AS Single-Skin Steel Cladding system offers rapid coverage and swift completion of a weatherproof building envelope to give a high performance building.


Single-Skin Steel Cladding is used in a wide range of buildings and situations from warehousing and industrial applications to agricultural and home outbuilding uses. Available in both box profiles and corrugated we have a profile to suit all situations. Steadmans Single-Skin Steel Cladding roof and wall systems are manufactured to the highest quality standards utilising premium pre-coated steel sheets rolled.

The panels are available in six profiles to suit differing uses and are available in a range of colours.They may be used to form roofs – down to 4° pitch (6° if roof lights are required) – and walls. The system includes a comprehensive range of spacers, fixings, sealants, guttering, flashings and roof lights. The AS single skin system offers rapid coverage and swift completion of a weatherproof building envelope to give a high performance building.


AS Single-Skin Steel Cladding roof and wall profiles are manufactured in process certified to ISO 9001:2008.

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Performance data for the ‘Single skin systems: AS series Roof & Wall profiles’ covers tables for wind suction, imposed load and drifting snow load for all the available colours and thicknesses of roof and wall profiles. It also includes profile dimensions, the durability and the life to first painting of the plastisol coated profiles, fire resistance results, thermal conductivity and the effects of biological attack.

Performance data sheets for all the single skin profiles are available in pdf format.


Steel Profiles

Standard external weather sheets are available in 0.5mm and 0.7mm thicknesses.

Tables 01 and 02 give the standard profile dimensions, weights, and manufacturing tolerances.

The steel used in the AS series roof and wall profiles is hot-dip galvanised to BS EN 10346:2009 or Aluzinc coated, then finished with one of the coatings listed in Table 03 or one of an equivalent quality.

Weather sheets are available in a number of different profiles, many with matching roof and wall profiles. The following pages show the details and load tables for each profile.

In order to maintain our high standards of customer service we may replace the steel listed here with that of similar quality from different suppliers.

For technical and performance details of all profiles download the performance data.

Table 01: Profile Dimensions

Cover 1m
Standard lengths 1.8 – 12m (others on request)

Table 02: Manufacturing tolerances

Cut to length: L < 3m +/- 5mm
Cut to length: L > 3m +/- 10mm
Cover width -0mm / +3mm
End square -3mm / +3mm

Table 03: Single-Skin Steel Coatings – Weather Sheet

200LG 200 micron PVC Plastisol A high performance pre-painted steel system on a hot dipped galvanised substrate. The outer face is finished with a leather-grain embossed PVC while the inner face is finished with a heat cured epoxy paint system.
Dobel Nova A 50 micron thick acrylic polymer coating which has high wear resistance, excellent colourfastness and good flexibility. The coating contains no PVC or Isocyanates and the material is wholly recyclable.
Polyester A polyester coating with a medium term life.
Agri-Steel A polyester coating recommended for the agricultural market. Agri-Steel has a superior substrate coating and interior paint finish when compared to standard polyester.
200LG Plastisol A durable organic coating with Scintilla finish on a substrate treated with hotdipped zinc-aluminium alloy.
Corus and Dobel PVDF A 27 micron thick stoved flurocarbon coating: excellent colour stability at temperatures as high as 120ºC.


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 14.


Minor scuffing to the colour coating should not be treated. Deeper scratches which reach the substrate should be repaired with touch-up paint. The touch-up paint should only be applied to the original scratch using a fine paint brush. As touch-up paint will dry to a slightly different colour than the original coating the area to be touched up should be kept as small as possible.

Table 14 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.
Corrosion of cut edges. Cut or abrade edges back to clean bright metal and repaint: consult Steadmans Technical Department for guidance.

Supply and Site Handling

AS profiles are delivered to site in packs. Packer sheets are used at the bottom of the packs to provide protection and the ends of the packs are wrapped with plastic. Maximum pack weight is 2 tonne.

The packs can be off-loaded directly to the roof, or to a storage area, which should be dry and well away from traffic. Packs may be stacked using suitable wooden bearers and packers. Bearers should be placed above each other.

Handle AS profiles carefully to avoid marking weather sheets or liners. Lift sheets from the pack – do not drag them. Observe site health and safety procedures and the results of manual handling and other assessments.


Before fixing any sheets check the squareness and accuracy of the steelwork. Determine the direction of the prevailing wind. Check sheets for damage before fixing.


Roofs – General Sequence

Observe the general installation sequence:

  1. Lay and fix weather sheet (see laying sequences for sheets below).
  2. Fix flashings. Use foam filler pieces and butyl sealant to form weather tight junctions.
Roofs – double tier laying sequence – weather sheets

On a double tier roof lay the weather sheets in the order shown in figure 40.

  1. Lay weather sheet one with the female edge to the gable, away from the prevailing wind. Use a string line to lay the sheet straight and true. Fix the sheet at every purlin except the top one.
  2. Apply two runs of 6 × 5mm butyl sealant to the head of weather sheet one and a run of butyl sealant to the male crown for the length of the lap (figure 41).
  3. Lay weather sheet two with its female edge to the gable and the tail lapping the head of sheet one. Fix the sheet.
  4. Apply a run of butyl sealant to the male crown of sheets one and two (figure 42).
  5. Lay weather sheet three with its female crown lapping the male crown of sheet one. Fix the sheet at every purlin except the top one.
  6. Stitch the side lap with self-drilling fixings.
  7. Apply two runs of 6 × 5mm butyl sealant to the head of weather sheet three and a run of butyl sealant to the male crown for the length of the lap. Ensure the sealant laps the run on the male crown of sheet two (figure 43).
  8. Lay weather sheet four with its female crown lapping the male crown of sheet two and its tail lapping the head of sheet three. Fix the profile.
  9. Stitch the side lap with self-drilling fixings.
  10. Continue to lay the sheet along the roof, checking the alignment of the sheeting and correcting any deviations.

Figure 40


Figure 41


Figure 42


Figure 43

Walls – General Sequence

Observe the general installation sequence:
  1. Fit and fix weather sheets (see sequences for weather sheets above).
  2. Fix flashings. Use foam filler pieces and butyl sealant to form weather tight junctions.

Walls – laying sequence

The following sequence applies to weather sheets on walls:
  1. Set sheet one upright against the framing at the corner of the building with the female edge to the corner. Make sure the profile is vertical.
  2. Fix with one fixing in alternate valleys at each rail.
  3. Apply a run of butyl sealant along the male crown.
  4. Set sheet two upright with its female edge lapping the male edge of sheet one.
  5. Fix the sheet.
  6. Stitch the lap with self-drilling fixings (weather sheets only).
  7. Continue to lay sheets along the wall, checking the alignment of the cladding and correcting any deviations.

Cutting profiles

Where profiles have to be cut on site:
  • Use a powered reciprocating saw or circular saw. Do not use an abrasive wheel.
  • Support the profile along the line of the cut.
  • Protect the pre-coated finishes of the profile.
  • Clean any swarf or debris from the pre-coated finish of the profile immediately.


When all the sheets have been installed check:
  • All fixings are correctly fitted and tightened;
  • The fixings do not distort the profile;
  • All fixing caps are fitted;
  • Minor scratches have been treated;
  • The surface of the roof is clean and free of any swarf or debris.

Supply and Delivery

AS Single-Skin Steel Cladding profiles are available directly from Steadmans. AS Single-Skin Steel Cladding profiles are supplied banded and in a protecting profiled packing sheet: fully timber crated packs are available for sea freight shipping at additional cost.

AS Single-Skin Steel Cladding profiles are usually delivered to site. Off loading is the responsibility of the customer. Delivery by self off-load vehicles can be arranged.



  • 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 inbuildings.
  • 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 8206-2:2008 Code of practice for daylighting.
  • BS EN 10143:2006 Continuously hot-dip coated steel sheet and strip. Tolerances on dimensions and shape.
  • BS EN 10346:2009 Continuously hot-dip coated steel flat products. Technical delivery conditions.
  • BS EN 12056 Gravity drainage systems inside buildings.
    • BS EN 12056-3:2000 Roof drainage, layout and calculation.
  • BS EN ISO 10211:2007 Thermal bridges in building construction. Heat flows and surface temperatures. 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.
  • MRCMA Technical paper 14. Guidance for the design of metal roofing and cladding to comply with Approved Document L2: 2001
  • TM 37: Design for improved solar shading. 2006

Associated Products


Rooflights can be supplied to meet project requirements for light transmission, durability, non-fragility rating, fire resistance and thermal performance: contact Steadmans’ sales office for details.

Table 10: Rooflights

Property Units Value
Minimum slope ° 6
Maximum length m 7
Width (centre-centre) mm 1000


Steadmans manufacture and supply a range of gutters to match the AS single skin profiles. Gutters are produced from a variety of materials including pre-galvanised steel (to BS EN 10143:2006) and pre-coated steel, either painted or PVC-coated on one or both sides: aluminium can be supplied to special order. Complete gutter systems and accessories can be manufactured to specification, up to 10m long and 3mm thick: contact Steadmans’ sales office for details of sizing.

A full range of Hunter Plastics rainwater systems is available to suit all single skin profiles: contact Steadmans for more information.


Steadmans manufacture a range of flashings to match the AS Single-Skin Steel Cladding profiles in plastisol leathergrain, polyester, Nova, Scintilla, galvanised, or PVDF finishes. Flashings can be supplied in lengths up to 6m in traditional profiles, or can be shaped to meet special customer requirements.


Steadmans supply a range of NFRC Class A butyl sealants, profile foam fillers and expanding foams to enable AS Single-Skin Steel Cladding profiles to be sealed to each other and to other building components, so avoiding thermal bridging and air leakage.

Dripstop Drain

Dripstop Drain is a condensation control fleece designed to reduce risk of damage from dripping or running condensate on single-skin metal roofs. Dripstop Drain is available on all Steadmans AS30 and AS13/3 profiles.

The problem of condensation

Uninsulated roofs with single-skin metal sheeting are likely to suffer from condensation when the metal sheeting is cooled during the winter, or on cold clear nights. When warm air within the building cools on contact with the metal sheeting it can not support the same quantity of water vapour and may become saturated, with any excess water vapour condensing on the underside of the sheeting.

The condensate can drip from the roof, wetting the building’s fittings and/or contents, or may run down the roof and collect elsewhere within the building fabric where it can cause rust, rot or damage to fittings.


The Dripstop Drain solution

Dripstop Drain is a self-adhesive polyester fleece designed to be applied to Single-Skin Steel Cladding metal roof panels to prevent damage from condensation.

  • slows the formation of condensate by insulating the sheeting
  • prevents condensate dripping from the underside of the roof
  • drains condensate safely down the slope of the roof to a gutter.

Dripstop Drain is inended for roofs of 7° pitch or greater: the drainage rate is greater on steeper pitches.

Technical description

Dripstop Drain consists of a woven polyester fleece with self-adhesive polyethylene film backing.


Dripstop Drain does not support the growth of bateria and moulds.

Dripstop Drain Solution Properties
Weight 150g/m2
Thickness 1.7mm
Roll width (maximum) 1950mm
Colour White/black mix
Water absorption – fleece only > 700g/m2
Water absorption – installed > 1900g/m2
Drainage after one hour
Roof Pitch 7° >10%
Roof Pitch >15%
Roof Pitch 25° >40%

Dripstop Drain is applied to AS30 and AS13/3 sheeting during the manufacturing process. For further information on specifying Dripstop Drain please call our Technical Department on 01697 478 277 or email [email protected]


Dripstop Drain can be cleaned by pressure washing.

For more information on other Steadmans products contact our Sales Office on 01697 478 277. Alternatively, fax your requirements 01697 478 530, or email them to [email protected]. In Scotland, contact our Livingston office (Tel: 01506 437753, Fax: 01506 440716) and in Ireland contact our office in Banbridge, County Down (Tel: 028406 60516, Fax: 028406 60517).

Related Documents

Click here to view CE certificates for Single Skin Steel Cladding