The table below shows a quick comparison of the main finishes.
| PVC Plastisol | Polyester paint | Eco Grey Paint1 | Galvanised steel | |
|---|---|---|---|---|
| HD Zinc galvanised | ||||
| Primer painted |
||||
| Variety of colours |
Many | 5 Colours | ||
| Expected time to first maintenance | 15 to 25 Years | 10 to 15 Years | 5 to 10 Years |
1 to 5 Years |
| Scratch resistant | ||||
| Anti-condensation liner available | ||||
| Fade resistant |
Galvanised sheeting is a high quality hot dipped zinc coated steel with no additional finishes added. Now the base material for Polyester paint and PVC Plastisol coated roofing sheets, galvanised steel sheets have been used for over 100 years.
It is worth noting that galvanised steel will weather over time and become duller. Also galvanised steel can vary in finish and we highly recommend taking a coated sheet if colour is an issue.
As long as the material is fitted and treated properly then it can last a number of years, however the material is very susceptible to corrosion especially the steel underneath the zinc coating. We do not recommend using galvanised sheets within 3 miles of the coast as coastal environments can significantly decrease lifespan.
Galvanised steel sheets can sometimes be confused with stainless steel, however it is important to note these are different products.
Please be aware that galvanised sheets cannot be painted until they have weathered. This usually takes approx 6 months. If a more durable coloured finish is required please consider polyester painted or PVC plastisol sheets
Galvanised steel is not a colour and surface finish is not consistent. As the steel weathers you will see discolouration in areas. Over time the surface will become rougher as the material weathers. If you require a more consistent finish we would recommend using a coated steel finish such as polyester paint or PVC plastisol.
Care should also be taken when storing galvanised sheets. We recommend storing indoors at a consistent temperature to avoid water ingress and weathering whilst still stacked. Also degreasing the sheets is recommended to remove any excess rolling oil as this may cause reactions when the steel begins to weather.
Typical properties
| Property | Unit of measure | Value | Test standard |
|---|---|---|---|
| Standard zinc coating | (g/m2) | 275 (Z275) | |
| Minimum yield stress | (N/mm2) | 220 (S220GD) | EN 10147:2000 |
| Bending and profiling quality | DX51D | EN 10142:2000 | |
| Estimated time to first maintenance*: Dry and unpolluted Suburban and rural Industrial and urban Coastal |
(years) (years) (years) (years) |
20-50 5-10 2-5 1-5 |
|
| Fire classification | A1 | BS EN 13501 |
0.5mm is a lightweight gauge ideal for use on walls and smaller domestic and agricultural roofs. With a typical weight of only 4.8kg/m². 0.5mm gauge steel cladding is especially useful when weight is a concern. Please be aware that if you are planning to use 0.5mm gauge sheets on your roof then you must support the sheets more often2, typically every 0.6m (or 2ft).
0.7mm steel cladding is the established standard for roofing applications with a typical weight of 6.8Kg/m². 0.7mm gauge can typically be supported2 every 1m.
Polyester paint is a very useful for agricultural uses as it has been stated as an acceptable material by a number of agriculture authorities. Polyester paint is also a cheaper alternative for roofing than other materials available. Polyester is coated upon zinc-coated steel in accordance to BS EN 10147. This type of roofing has a medium lifetime and should be recoated every ten to fifteen years (or less if there is pollution).
When handling polyester painted sheets care must be taken as the polyester coating can easily be scratched. Also sheets should not be slid against each other as this can also cause wear in the surface coating.
Polyester paint coated sheeting is a very high quality galvanised steel sheet with a primer paint finished with a final layer of polyester paint.
Five standard colours
Galvanised substrate to BS EN 10346:2009 and primed undercoat offering excellent corrosion resistance
Typical properties
| Finish property | Unit of measure | Value | Test standard |
|---|---|---|---|
| Nominal organic coating thickness | (µm) | 25 | EN13523-1 |
| Specular gloss (60°) | (%) | 10-35 | EN13523-2 |
| Scratch resistance | (g) | 3000 | EN13523-12 |
| Abrasion resistance (Taber, 250 rev, 1kg) | (mg) | <30 | EN13523-16 |
| Flexibility (minimum bend radius) | (T) | 1.5 | EN13523-5 |
| Adhesion | (%) | 100 Pass | EN13523-6 |
| Corrosion resistance: Salt Spray Humidity |
(h) (h) |
500 1000 |
EN13523-8 EN13523-25 |
| UV Resistance | Excellent | EN10169 | |
| Fire classification | A1 | BS EN 13501 |
0.5mm is a lightweight gauge ideal for use on walls and smaller domestic and agricultural roofs. With a typical weight of only 4.8kg/m². 0.5mm gauge steel cladding is especially useful when weight is a concern. Please be aware that if you are planning to use 0.5mm gauge sheets on your roof then you must support the sheets more often2, typically every 0.6m (or 2ft).
0.7mm steel cladding is the established standard for roofing applications with a typical weight of 6.8Kg/m². 0.7mm gauge can typically be supported2 every 1m.
PVC Plastisol coated sheeting is a very high quality galvanised steel sheet with a primer paint and the PVC rolled onto it resulting in a very durable end product that doesn't fade or scratch easily.
Fire: When tested, Class 0 in accordance with building regulations BS476 part 6 1989 and Part 7 1987.
200µm durable, abrasion-resistant topcoat
Leathergrain embossed finish
Wide colour range
Galvanised substrate to BS EN 10346:2009 and primed undercoat offering excellent corrosion resistance
Manufacturers coating guarantee of up to 25 years to first maintenance*
* 20 years for coastal areas (some colours 10 to 15 years see colours for more details)
Please note: Coating warranty must be applied for at point of order
Typical properties
| Finish property | Unit of measure | Value | Test standard |
|---|---|---|---|
| Nominal organic coating thickness | (µm) | 200 | EN13523-1 |
| Gloss (60°) | (%) | 15-35 | EN13523-2 |
| Scratch resistance | (g) | 3500 | EN13523-12 |
| Abrasion resistance (Taber, 250 rev, 1kg) | (mg) | <12 | EN13523-16 |
| Flexibility (reverse impact) | (J) | ≥18 | EN13523-5 |
| Adhesion (cross hatch) | (%) | 100 Pass | EN13523-6 |
| Minimum bend radius | (T) | 0 T@16°C | EN13523-7 |
| Corrosion resistance: Salt Spray Humidity |
(h) (h) |
1000 1000 |
EN13523-8 EN13523-25 |
| Max continuous operating temp. | (°C) | 60 | |
| Reaction to fire | Class 0 | BS476 part 6 & 7 | |
| Resistance to fire | Class AA | BS476 part 3 | |
| C-s3,d0 roof and wall | BS EN 13501 | ||
| External Fire Performance | Broof T4,T3,T2,T1 | BS EN 13501 |
0.5mm is a lightweight gauge ideal for use on walls and smaller domestic and agricultural roofs. With a typical weight of only 4.8kg/m². 0.5mm gauge steel cladding is especially useful when weight is a concern. Please be aware that if you are planning to use 0.5mm gauge sheets on your roof then you must support the sheets more often2, typically every 0.6m (or 2ft).
0.7mm steel cladding is the established standard for roofing applications with a typical weight of 6.8Kg/m². 0.7mm gauge can typically be supported2 every 1m.
Polyester paint and PVC Plastisol coated sheets are also available with an anti-condensation liner added to the underside of the sheet.
This simple method of rolling a flock material to the underside of our box profile and corrugated sheets reduces the risk of condensation* and drastically cuts the cost associated with full insulated panels.
Adding anti condensation liner to our roof sheets is a cost effective method of handling condensation problems in many buildings. If you believe that there is a chance of condensation we would highly recommend Dripstop anti condensation liner as an extremely effective solution.
When the temperature and humidity conditions in the building reach dew point, moisture will condense on the underside of an uninsulated metal roof sheet. If there is a lot of condensation, water droplets will form and start to fall. The traditional method for eliminating build up of condensation is to insulate the roof so that the temperature on the metal sheet never reaches the dew point.
Drip Stop anti condensation liner is pre rolled onto the sheet and will provide a much more cost effective solution than full roof insulation.
Roofing sheets lined with Drip Stop anti-condensation material provide a medium for trapping this moisture in the specially designed pockets formed in the membrane. Drip Stop holds the moisture until conditions go back below the dew point. The moisture is then released back into the air in the form of normal humidity.
Drip Stop is self adhesive felt liner that is applied to our sheets during the roll forming process. This means that the sheets will arrive with you with Drip Stop already in place, ready to be installed immediately. Your sheets are then installed as normal.
0.5mm is a lightweight gauge ideal for use on walls and smaller domestic and agricultural roofs. With a typical weight of only 4.8kg/m². 0.5mm gauge steel cladding is especially useful when weight is a concern. Please be aware that if you are planning to use 0.5mm gauge sheets on your roof then you must support the sheets more often2, typically every 0.6m (or 2ft).
0.7mm steel cladding is the established standard for roofing applications with a typical weight of 6.8Kg/m². 0.7mm gauge can typically be supported2 every 1m.
| Aluzinc | Aluminium | Copper | Stainless Steel | Weathering Steel4 | |
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4 Cor-Ten weathering steel oxidises to form a protective coating with a rust like appearance.
Tel: 01384 273811
Fax: 01384 277399
Email: sales@steelroofsheets.co.uk
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Registered in England and Wales 06763899
