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Fastners

Screws


Screws must:

  • Be EPDM washers 
  • Be tightened so that the washer is gripped firmly but not distorted.
  • Be suitable for roof type and location.

Rivets


Rivets must be:

  • Sealed blind rivets only
  • Suitable metal for the roof sheet and location.
  • Should also be sealed over with neutral cure silicone sealant.

What is pierce fastened roofing?



Generally corrugated or trapezoidal in profile, pierce fixed roofing is metal or plastic sheet that is attached to the building with fasteners. Screws, for timber and steel frames, nails for timber alone. The fasteners penetrate the sheets the crests of each sheet generally at every 2rd or every 3rd crest. However, some profiles require fixing through every crest.

What is concealed fastened roofing?


Concealed-fixing is the method of fixing sheets using fasteners which do not pass through the sheet, instead, the sheeting is held in place with clips fixed to the roof framing.

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