CONCEALED FIX ROOFING
Concealed-fixing, also refferred to as secret fix, is designed for very low pitched roofs.
Because clips under the sheet hold it down, the sheet is not punctured with fasteners
and remains completely waterlight even at a very low slope. The securing clips are
pre-fixed into the purlins and the sheet is mechanically snapped onto the clip.
Saflok 700 is a concealed fix sheet profile with an effective cover width of 700mm. It is
an angular interlocking standing seam trapezoidal rib profile, and is usually roll formed
on mobile mills on the building site.
CLIPPING SYSTEM
The Saflok 700 clip incorporates a dual action component to positively hold down the
male-female joint on every third rib and the anchor to clasp the two inner ribs. Every
rib is therefore secured making it fully interlocking, It is essential that the male rib is
directly engaged to the under side of the clip.
Clips for Aluminium material:
•An aluminium clip is necessary when using aluminium material.
•When using Alumium material on galvanised sheet purlins it is recommended
to make use of an isolation tape to prevent the bridging of the two dissimilar materials. The recommended tape is a “Denso LDP 300” or similar. Should the two metals
have direct contact it will ultimately result in the manifestation of galvanic corrosion.
The service life of the aluminium will be compromised.
CLIP (Material: AZ 0.8 or 1.00mm TCT)
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