SAFLOK 700: CONCEALED FIX ROOFING
Saflok 700® is a concealed fix profile with an effective cover width of 700mm. It is an angular interlocking trapezoidal rib profile, and can be roll-formed on site.
SAMPLE SPECIFICATION
Safintra 0.50mm thick Saflok 700® Colorplus® AZ 150 interlocking roof sheeting fixed to steel internal purlins at 1900mm centres and ridge/eave purlins at 1700mm centres using Saflok 700® clips which are fastened to steel purlins with Fixtite™ or Safintra approved wafer head self-tapping fasteners, all in accordance with the manufacturer’s recommendation.
The sheeting will be a double interlocking concealed fix Saflok 700® profile as manufactured by Safintra. Roll-forming in continuous lengths from certified G550 steel.
The profile shall be roll-formed with 4 ribs and centres not exceeding 233mm and a cover width of 700mm. The male rib is to include spurs to ensure a double interlocking action with adjacent sheets. The minimum rib height will be 41mm. Two stiffening ribs are incorporated in each pan.
NOTE 1
When installing Saflok 700® as side cladding, it is advisable to orientate sheets in a single direction, as this may have a visual impact when reflected in direct sunlight. The direction of the “dot matrix” branding that appears at regular intervals on the backing coat, can be used as a practical guide on site for roofing crews.
NOTE 2
Saflok 700® can be curved or bullnosed to a minimum internal radius of 450mm. Reverse cranking is not possible.
MATERIAL OPTIONS
Note that when using Aluminium material on galvanized steel purlins, the use of an isolation tape or similar to prevent the bridging of the two dissimilar materials is recommended. Should the two metals have direct contact it will ultimately result in the manifestation of galvanic corrosion, and the service life of the Aluminium will be compromised.
Material and coating thickness can vary regionally. Consult your local Safintra branch for availability.
PURLIN SPACING & DRAINAGE
Span tables are for Saflok 700® with light foot traffic only. It is based on 1.5kN downward load and 2kPa negative wind loading. The span table below refers to the maximum recommended spans. For further information, consult Safintra’s Technical Department.
Saflok 700® clips are calculated at 330g per clip. You will require approximately 1.5 clips per m². The Saflok 700® Clip 35 (as a whole) and the anchor mechanism are separately design registered with the following numbers: For the complete clip: South African Design Application. No. F2017/00455; and for the anchor mechanism: South African Design Application No. F2017/00456*.
Drainage Table
*Refer to the Safintra Technical Department for more information or raise any enquiries in writing to info.safintrasa@safalgroup.com
NOTE 4
Concealed fix side cladding must be pierce fixed for prevention of sheet movement due to gravity. Pierce fix the top of the sheets. Internal pierce fixing may be necessary on longer sheets (in consultation with the Structural Engineer). Cladding is to be fixed in the pan of the sheet with #12x25mm Fixtite™ fasteners.
LENGTH AND ROOF PITCH
Saflok 700® can be ordered in any practical length as per customer requirements. On-site rolling is recommended for lengths in excess of 13.2 metres, limited by space constraints and building design. The minimum roof pitch when using Saflok 700® is 2°.
Clip-in marks and/or faint repetitive waviness, commonly referred to as oil canning, may be witnessed occasionally. This does not indicate any mechanical defect in the sheet.
FIXING GUIDE
FASTENERS
Where insulation is to be installed, you may need to increase the length of the fasteners given below, depending on the density and thickness of the insulation and packer.
When the fastener is properly tightened:
• Into metal: There should be at least three threads protruding past the purlin you are fixing to.
• Into timber: The fastener must penetrate the timber by at least 30mm.
The Saflok 700® Clip 2 incorporates two anchors to clasp the two inner ribs and a dual action gooseneck to positively hold down the male-female joint.
- The Saflok 700® Clip 21 is the recommended clip for securing Saflok 700® onto timber or steel purlins.
- The patented design is strong and durable.
- Suitable for installation on a tubular frame.
- The entire clip is manufactured from 0.80mm Aluminium-Zinc coated steel for compatibility with sheeting.
- The extended base plate is self-aligning, which makes it better suited for timber application. Timber structures can be prone to slight surface deformation that may negatively impact the secure anchoring of the clip.
- Are to be secured with three fasteners.
- A clip must be installed on each and every purlin.
NOTE 5
Please note that clips can be manufactured in alternative metals to ensure metal compatibility.
SAFLOK 700® CLIP 35
The fully interlocking Saflok 700® Clip 35 incorporates two anchors to clasp the two inner ribs and a dual-action gooseneck to positively hold down the male-female joint.
- The Saflok 700® Clip 35 demonstrates an excellent hold down capability in negative wind uplift load tests.
- The entire clip is manufactured from 0.80mm Aluminium-Zinc coated steel for compatibility with sheeting.
- Stiffener ribs on the base plate add formidable strength, specifically over the gooseneck.
- Full width engagement on the gooseneck male rib joint.
- Five fastening points for strength.
- Engineer-designed geometry of anchor unit for optimal performance under high wind loads and foot traffic.
- Are to be secured with five fasteners.
- A clip must be installed on each and every purlin.
SAFLOK 700® INSTALLATION
- Starting with the female rib first, align the first row of clips and fasten on all fastening positions.
- Lay the first sheet down over the clips. Starting at the eave side, clip the sheet onto the clips by first engaging the anchors and then engaging the female rib over the gooseneck and male rib.
- Engage the gooseneck of the next row of clips over the male rib and fasten in all fastener positions. Ensure the male leading edge has adequate support (might require slight lifting of the male rib or rotation of the clip). Repeat from step 2.
NOTE 6
During installation, clean the roof daily by removing all swarf, pop rivets and unused fasteners or any other debris.
NOTE 7
A system performance warranty will be applicable provided that the installation has been performed by a Safintra Approved Roofing Contractor and the project has been inspected by Safintra.
SPECIALISED FIXING ACCESSORIES
Overhangs are prone to a build up of wind pressure and are considered to be the weak point of any roof. All overhangs larger than 600mm need to be positively fixed with a high wind load clip or saddle washer (always allowing for thermal cycling). These include canopies, walkways, lean-to roofs, loading bays and decorative roofs.
- Align the first row of the polyslider baseplates and fasten through the pre-drilled holes in the three positions where the slider brackets attach.
- Connect the slider brackets to the base plate and lay the first sheet over the slider brackets.
- Place the saddle washers over the first three ribs above the purlin, and fasten the saddle washers through the ribs into the slider brackets.
- Place the next row of baseplates and fasten. Overlap the end fastening positions to self-align the row of baseplates. Repeat from step 2.
NOTE 8
All polycarbonate sheet installations (including, but not limited to in-plane installations) with Safintra roofing/cladding profiles should be done in accordance to SANS 10237:2023 (Annexure C Rooflights).
NOTE 9
In a springing or draping application, consideration should be given for the inclusion of high wind load brackets at the eaves.
NOTE 10
The bonded saddle washer can only be fixed from the top.
SPECIALISED FLASHING INSTALLATION
Safintra recommends the use of Flashing Slider Brackets for very long sheets. Please consult our Technical Department for assistance.
When installing bull-nosed sheeting or Aluminium sheeting, the use of flashing slider brackets is recommended for sheets with lengths in excess of 15 metres. Please consult Safintra’s Technical Department for assistance.
The clip-on slider clips onto the rib of the Saflok® profile to fix longitudinal flashings (barge, sidewall) to the sheeting without the need for fasteners piercing the sheet. The clip will allow for more thermal expansion than the F10 bracket. Clips are available in Aluminium-Zinc coated steel.
F10 BRACKET FOR FLASHINGS
F10 brackets are used as an intermediate anchoring mechanism for flashings, thereby eliminating direct penetration. Brackets are available in Aluminium-Zinc coated steel, Stainless Steel Grade 304 or Aluminium.
NOTE 11
This clip is positively fixed. Care should be taken when detailing industrial length sheeting and flashings due to thermal expansion.
2-PIECE SLIDER FOR FLASHINGS
The 2-piece sliders are used to fix transverse flashings (apex, ridge, headwall) to the sheeting without drilling directly into the sheet. This bracket will allow for up to 50mm of thermal expansion. Due to the effects of thermal expansion and contraction, “first sheet” installation should never be attempted by positively fixing the sheet to the structure. Sliders are available in Aluminium-Zinc coated steel, Stainless Steel Grade 304 or Aluminium.
SAFLOK® STARTER BRACKET
The Saflok® starter bracket is used to secure the first and/or last rib of the edge sheet without restricting thermal expansion. Starter brackets are available in Aluminium-Zinc coated steel and Stainless Steel Grade 304.
SAFLOK 700® LIPPING & BENDING TOOL
The bending tool is used to bend the pan up on the ridge side of the sheet to create a water barrier (also known as the tanking or turning up of the sheet). The lipping tool is used on the eave side of the sheet to create a turned down lip (also known as the lipping or turning down of the sheet).
Saflok 700® bending tool application
Saflok 700® lipping tool application
CRANKING
Saflok 700® sheets can be cranked and bullnosed but not reverse cranked. The minimum radius is 450mm. On-site cranking is available on request.
CURVING
For the Saflok 700® profile natural springing occurs at a 36m radius in the convex and at a 60m radius in the concave. It is important to reduce purlin spacings by 20% when spring curving a roof. Oil canning may be expected.
ROLLING STRAIGHT ONTO A ROOF
It is possible to roll-form straight onto a roof using a scaffold ramp. The limitations are the building height and space needed to roll. A departure angle of 10° is the maximum allowed at any time. A greater angle would damage the sheet when leaving the mill and again when bending to settle onto the roof.
DIMENSIONAL TOLERANCES
A length variation range of +10mm and -0mm, and a width tolerance of ±3mm is permissible.
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