Permalite® provides a wide range of fixing screws and washers to provide reliable, durable performance in all aspects of fixing roofing sheets, cladding and flashings.
The specification of fixings supplied by Permalite® is aimed at the specifications, environment and purpose of the roofing and cladding sheets. Purchase and use of substandard or inferior alternatives from other sources should be avoided.
Crest Fasteners – Our unique ‘Positive Fix’ system provides full security against wind uplift and water penetration while at the same time allowing movement of the roof sheeting and roof structure due to thermal expansion or contraction.
Valley Fasteners – used mainly for wall fixing to steel girts, the stainless steel self-tapping fastener, RA014, RA114 or RA018 with an aluminium / rubber bonded washer hard fixed into the girts.
Our ‘Positive Fix’ system provides for thermal expansion on the roofing sheet by hard fixing at the top of the sheet slope with expansion fixing being used to accommodate expansion towards the lower end of the sheet slope.
Hard fixing is used where sheet lengths are such that the thermal expansion is not a significant issue i.e. 9m or less.
Our comprehensive brochures provide specific details in relation to the type of fixings appropriate for each sheeting type and application in both cyclonic and non cyclonic areas.