Fixing Metal Roof Sheets

Metal roofs are made from a wide variety of materials.

Fixing metal roof sheets.

Fixings used to attach roofing sheets to purlins having to be durable and able to withstand considerable wind pressures. The screws that are used to attach the metal roofing are self drilling screws. If fixing screws are left in the valleys your roof will leak in hundreds of places. The general advice for fixing is 4 5 screws across the sheets purlin we advise using 1 screw on the overlap of the next sheet.

What was previously a valley in the corrugations will now be a ridge and the nail hole will be in the correct place. This means that the screw will drill its own hole through the metal roofing panel and into the metal or wood substrate. Over time this coating can wear away leaving the metal panels to oxidize. 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.

These include steel aluminum tin copper and zinc. Remove roofing and turn each sheet over. You will have to paint the roof but is cheaper than buying new roofing. Pull and re nail them.

Some of these materials are subject to oxidation. If you asked two installers whether they pre drill metal roofing sheets prior to installation you would likely get two completely different answers. 1 look for loose nails. 2 look for holes rust patches or other signs of deterioration.

As with all of the fixing screws provided you can use a colour cap to hide the stainless steel head. Corrugated roofing sheets should be installed into the corrugated sheets crown using a 65mm tek screw with baz washer.