Fasteners

Box profile sheets are always fixed with a tech fasteners in the * valley (trough) part of the sheet directly into the purlin underneath. These screws are purpose made fittings for these sheets and are drilled in with an 8mm socket driver fitted in the chuck of your electric drill. A standard 8mm (5/16) ¼ drive socket fitted in the chuck of your electric drill will also do the job.

The advantages of fitting in the valley is the fitting applies a high torque when tightened correctly, without distorting the sheet, the rubber seal bonded to the galvanized washer achieves a watertight fit and because the crowns (profiles) are left clear, you achieve a better aesthetic look. They come with the relevant colour cap which fits over the fastener head to complete the job.

We carry a comprehensive stock of fasteners for fixing to timber purlins, Galvanised steel purlins and even hot rolled sections such as angle iron, box channels and RSJ’s If you are unsure on the correct type of fasteners you will need we will be pleased to offer our advice and guidance.

Stitcher Fasteners

They are basically self tapping screws which stitch/secure two metals together. Stitcher screws are purpose made for fitting various flashings/trims to the sheets and are also used down the side of the sheets where they overlap to the adjoining sheet. This last detail is only necessary if the site is exposed and open to high winds/rain etc, if this is the case you are recommended to fit a butyl sealant strip between the overlap prior to stitching them together. Stitcher Fasteners are fixed approx every 400mm and again are drilled in with an 8mm socket driver fitted in the chuck of your electric drill, or a standard 8mm (5/16) ¼ drive socket fitted in the chuck of your electric drill will also do the job. They come with the relevant colour cap which fits over the fastener head.