Frequently Asked Questions
Are my sheets checked before I receive them?
All sheeting products and accessories are closely inspected and monitored at every stage of manufacture and supply. Once made and packed, sheeting is safely stored ready for collection or dispatch. Each load undergoes a thorough inspection before delivery and cover sheets are used to protect sheet packs.
Should I get my sheets delivered?
Delivery is worth the extra expense as sheets and flashings are bundled together and shipped in packs that are heavy and awkward to handle. When taking receipt of your order, check it’s correct and consistent with the accompanying delivery note. Any issues should be immediately reported to us by phoning our Customer Service Team on 01837 659 901. Two people should be able to lift a single sheet at a time off a delivery truck. Please note the edges of sheets and flashings can be sharp so remember to wear suitable protective gloves with rubber palms for grip. Items can be collected from our premises in Okehampton, Devon. Simply call us to arrange.
To check your delivery costs please vist the delivery section.
Do I need flashings?
Flashings are an integral part of any sheeted roof, covering the ridge where the two sides of a pent/single pitch roof meet, closing off the corners and ends of runs of sheets, creating an apron where a roof abuts a wall or sealing off reveals such as doors and windows. We stock a standard 90º corner or 130º ridge flashings in popular colours. Flashings are generally fitted directly to the high point of the profiled sheet using self-drilling stitching TEK screws (ST22) that has a coarse thread that joins two pieces of sheet metal together. Flashings are available in standard 3m lengths. They should be fitted with a 150mm overlap.
If you require custom made flashings, please call our sales team on 01837 659 901.
How should I handle the sheets?
Care should be taken when handling sheets to prevent damage or injury. When handling sheets protective clothing such as gloves, steel toe capped boots and high visibilty jackets should be worn to avoid accidents. Ideally mechanical handling equipment (e.g. a forklift truck) should be used where appropriate. Dragging one sheet’s edge across another may cause scratching of the sheet below so take care to lift and not drag sheets. Any packaging should be removed before lifting sheets onto a roof. Once on the roof and prior to fixing, sheets should be kept secured to the roof, close to the rafter line and, in so far as is possible, spread out so their weight is evenly distributed across the purlins. Any debris arising should be removed and off-cuts of insulation, surplus fasteners and similar not left on the sheeting.
How do I fit my sheets?
The fixings used to attach sheets to purlins must be durable and able to withstand considerable wind pressures. The exact type required will depend on the sheet and purlin type (timber/light steel/heavy steel) however we usually recommend selfdrilling TEK type screws with a 5/16th hex head.
Self-drilling TEK screws have a drill point for drilling through the sheet and purlin before tapping into the purlin. Under the head is a 19mm stainless steel washer with bonded neoprene pad that compresses to create a seal with the roof sheet. The screws can be fitted through the trough or pan sections of a sheet’s profile, or if fixing corrugated sheets, through the crest of the sheet’s profile using a longer screw and a soft BAZ washer. It can be helpful to use a centre punch to indent the sheet at the point you want the screw to go through to keep the screw on course when screwing it in.
Handy Advice: - Make sure fixings are not over tightened as this can burn off the soft neoprene pad under the washer.
Under normal conditions sheets should typically be fixed to supporting purlins at every second trough or third corrugation with fixings in every trough at the bottom / eaves to help protect against wind uplift if the roof is in an exposed position. Exactly what is required however will depend on the circumstances.
Handy Advice: - A stretched string along the purlin line can make it easier to keep the fixings in line when the sheet is laid on the purlins.
Transport Handling and Storage
All materials arriving on site must be checked fully before offloading. We recommended offloading using either a forklift or telehandler. Care must be taken not to tip sheet packs or damage the bottom panel when using forks or driving on uneven ground. Cladco advise unloading one pack at a time to avoid any potential damage. We advise wide open forks fully before lifting to avoid any tipping or damage to the sheets, it can be helpful to mark the midpoint of a pack to help with unloading.
PLEASE NOTE: When manually offloading, make sure appropriate operatives are on hand wearing adequate protective clothing such as protective gloves and footwear. Please note the customer is required to provide safe offloading assistance. Our vehicles will not deliver where access is unreasonable or limited. Our vehicles will not deliver if there is a likelihood of damage to the vehicle or surrounding property. Our drivers will decline unreasonable requests to unload, i.e. unloading alone, walking with sheets long distances, unloading sheets into awkward entrances or passing sheets onto the roof etc.
Where possible, sheeting should be offloaded directly to the area where they will be used to reduce the risk of on-site damage. Sheet packs should be stored flat on level ground on timber bearers and should never be stacked more than than two packs high. There should be adequate separation between packs to provide access and to avoid end damage. Do not store heavy materials on top of sheets and do not store sheets where people will walk across them.
If sheeting is to be left some time before use:
Do not leave uncovered packs in the open. Capillary action draws water deep into sheet packs which can cause staining of the sheet colour coating. Cladco advice to store sheets under cover and away from open doorways to reduce moisture penetration of sheet packs.
If packs cannot be stored under cover, erect a simple cover with a waterproof sheet. Ensure space is left between cover and sheets to allow air to circulate.
Store packs off the ground and on a slope, so that should rain penertrate the cover, the water will drain away.
Inspect the storage site regularly to ensure that moisture has not penetrated the stack. If sheets become wet, the sheets should be separated, wiped with a clean cloth and stacked to allow air complete drying.
Which is the right type of sheet?
The type of sheet required will depend on the building type, use and appearance. Cladco Profiles manufacture and supply 3 different types of profiled sheeting, all of which can be supplied to the exact length necessary in a choice of colours, with the necessary roof lights, flashings, fixings, fillers etc. We stock a standard range on our website, however if you require custom sheets or colours which are not on our website, please call our friendly sales team on 01837 659 901 to discuss your requirements.
34/1000 Box Profile Sheeting
34/1000 box profiled sheeting is our most popular profile for either roof or wall cladding. This profile gives 1 metre width cover when lapped and can be made up to 9 metre lengths (for 0.7mm thickness) This is our strongest single skin sheet due to its 7 rib 34mm deep profile sections and can be used on roofs at minimum pitch of 4º. It is fixed through the lower part of the profile to the purling using self drilling TEK screws. For sheets longer than 6m please contact our sales team to order.
13/3 Corrugated Sheeting
13/3 corrugated sheeting gives a traditional look to either roof or wall cladding. Corrugated sheets give 990mm width cover when lapped and can be made up to 6 metre lengths. Corrugated sheeting is not as strong as 34/1000 box profile due to its smaller profile sections with this in mind you may need closer purlin supports. Corrugated sheeting can be used on roofs at minimum pitch of 10º. Due to its curved shape it is fixed through the higher part of the profile to the purling using either longer self drilling TEK screws or traditional nails and spat washers.
Drip-Stop Anti-Condensation Finish
Both 34/1000 profile and 13/3 corrugated sheeting are available with Drip-Stop anti-condensation polyester felt flock on the reverse. This is a well proven cost effective method of stopping condensation dripping from steel roofs in damp cold conditions without going to the expense of using insulated sheeting. For dripstop Anti-condensation finish please call us on 01837 659 901 to place your order.
41/1000 tile form roof sheet gives a roof a pan tiled appearance, giving 1 metre width cover when lapped and can be made up to 5 metre lengths. Tile sheet is considered not as strong as either 34/1000 box profile or corrugated 13/3 due to its stepped sections. These sheets require purlin spacings of 600mm centres. These sheets can be used on roofs with a minimum pitch of 12º. It is fixed through the lower part of the tile profile to the purling using self drilling TEK screws.
Can I order a colour swatch sample?
You can order a colour swatch sample through our website here: https://www.roofingsheets.com/samples
Please note this is a metal colour swatch and will not be profilled. You can order up to 3 samples at a time and they will be posted Royal Mail 2nd Class.
What will it look like once it’s done?
Only you can really picture how your finished project will look as you know the space better than anyone, however we have a gallery of images that might help to inspire you with your new roofing design.
Care and Maintenance of my sheets?
Your new roof should be inspected at least yearly and cleaned of debris such as leaves to ensure a long useful life. Areas that have become marked may be cleaned using soap and water. More persistent marks may be addressed through the usage of white spirit or car paint cutting compound.
How much should each sheet be lapped?
Just 1 corrugation or profile. However, you may want to lap more corrugations or profiles on the last sheet of the run so the last sheet dose not protrude over the end of the roof.
When using TEK self drilling screws, do you fit them on the top or the lower part of the sheet profile?
The lower part. They have a neoprene washer below the screw head to prevent leaks and as long as the screws are fitted square, there should be no leaks. If the screws were fitted to the top of the profile the profile and sheet would distort as the screw is tightened. *When fitting corrugated sheets you should fix through the top of the profile using a screw with a BAZ washer*