PRODUCT DESCRIPTION & FEATURES
Concealed-fixing, also referred 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 watertight even at a very low slope. The securing clips are pre-fixed into the purlins and the sheet is mechanically snapped onto the clip. As a concealed fix sheet can also expand and contract over the clips as the temperature changes, this system is ideal for long spans on industrial, commercial and retail buildings.
SAFLOK 410 is a concealed fix sheet profile with an effective cover width of 410mm. It is an angular interlocking standing seam trapezoidal rib profile, and is usually roll formed on mobile mills on the building site
The SAFLOK 410 clip incorporates a dual action component to positively hold down the male-female joint on every second rib, and an anchor to clasp the inner rib. Every rib is therefore secured, making it fully interlocking.
Safintra 0,50mm thick SAFLOK 410 Colorplus® AZ150 interlocking roof sheeting fixed to steel internal purlins at 1800mm, and ridge/eaves purlins at 1600mm centres using SAFLOK 410 clips which must be screw fixed to steel purlins with Fixtite® or Safintra approved wafer head self-tapping screws, all in accordance with manufacturer’s recommendations. The sheeting will be a double interlocking concealed fix SAFLOK 410 as manufactured by Safintra Roofing, roll-formed in continuous lengths from Aluminium or Aluminium-Zinc coated
steel. The profile shall be roll-formed with 3 ribs at centres not exceeding 205mm and a cover width not exceeding 410mm. The male rib is to include spurs to ensure a double interlocking action with adjacent sheets. The minimum sheet depth shall be 41mm. Two stiffening ribs are incorporated in each pan.
With the aid of mobile rolling mills, custom lengths can be rolled on-site. To date the longest continuous sheets in South Africa have been in the region of 130m long. Off-site rolled sheets are cut to transportable lengths (approximately 12m).
SAFLOK 410 was designed for roof pitches from as low as 2° (1 in 50) however 3° is preferred. It can also be used on walls. When applying to very steep roof pitches you should pierce-fix through each sheet under the flashing or capping, along the top of the sheet to prevent the concealed-fixed sheeting from sliding downward in the fixing clips. Clip-in marks might be visibl e on high pitched roofs. This visual effect might not be aesthetically pleasing in a residential application.
Saflok 410 is fastened to the purlin by means of a Saflok 410 clip. Sheets are mechanically locked onto the clips and are not perforated at all. It is essential that the male rib is directly engaged to the underside of the clip.
NEVER re-use a Saflok 410 clip.