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Fix Sheets

Remember – do not overtighten or under tighten your screws as this can affect the performance of the washer and prevent it from sealing correctly. See diagram below.

Fixings used to attach roofing sheets to purlins having to be durable and able to withstand considerable wind pressures. The exact type of fixings required will depend on the roofing sheet and purlin type (either timber, light steel or heavy steel), however, we recommend self-drilling TEK type screws with a 5/16th hex-head for optimum performance.

Self-drilling TEK screws have a drill point for drilling through the sheet and purlin before tapping into the purlin itself. Under the head is a 19mm stainless steel washer with a 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. As in their name they are self-drilling tek screws, but if you wish you can use centre punch to indent the metal sheet at the point you want the screw to go through, to keep the screw on course when screwing it in.

How to Fit Roofing Sheets

For Box Profile 34/1000 sheets the fixings required will depend on the material used in the purlins. Cladco offer a range of fixings available to fix into most purlin materials. For example:

Self drilling TEK type screws with a 5/16th hex head and a stainless steel and neoprene bonded saddle washers, used in lower section of sheet profile to fix sheet to either wood or metal purlins. Longer screws up to 175mm in length are available for fixing through insulation materials or boarding.

Self drilling "stitching" TEK screws are available for fixing trims to sheet or sheet to sheet on laps. Colour caps are used to cover screw heads.

To fix the sheets, each 34/1000 Box Profile sheet has 6 troughs, for securing we recommend you fix the sheet into trough 1, 3, 4 and 6. The bottom end of the sheets you can fix in each trough to help prevent wind uplift of the sheets.

Colour caps are used to cover the ends of fixings, this allows the fixing to blend into the sheets colour.

For tile form sheets the fixings required will depend on the material used in the purlins. Cladco offer a range of fixings available to fix into most purlin materials. We suggest a minimum of 45mm screw. For example:

Self drilling TEK type screws with a 5/16th hex head and a stainless steel and neoprene bonded saddle washers, used in lower section of sheet profile to fix sheet to either wood or metal purlins. Longer screws up to 175mm in length are available for fixing through insulation materials or boarding.

Self drilling "stitching" TEK screws are available for fixing trims to sheet or sheet to sheet on laps. Colour caps are used to cover screw heads.

To fix the sheets, each tileform sheet has 5 troughs, for securing we recommend you fix the sheet into trough 1, 3 and 5. The bottom end of the sheets you can fix in each trough to help prevent wind uplift of the sheets.

For corrugated sheets the fixings required will depend on the material used in the purlins. Cladco offer a range of fixings available to fix into most purlin materials. For securing Corrugated sheeting longer screws are required as you are fixing into the crown of the sheet. For example, fixing into wood a 65mm TEK screw with a baz washer is suggested. If you are using alternative purlin materials please speak with our sales team for further advice. Generally, 4-5 fixings are used across the sheet per purlin, 1 fixing must be used in the overlap of the next sheet.

Colour caps are used to cover the ends of fixings, this allows the fixing to blend into the sheets colour.

Another tip to remember is if you use a stretched piece of string along the purlin line, this can make things even easier when looking to keep the fixings in line when the sheet is laid on the purlins. Small things like that can make a big difference with how your roofing turns out; it’s best not to overlook the basics. You’ll find all the parts you need for fixing roofing sheets in our Fixings & Accessories section, as well as all the necessary Z Purlins we stock.

If you need any other advice when installing your build, be sure to check out the other helpful sections in our Help & Advice section. For everything else, please contact us directly by email or phone and we’ll aim to help you quickly.