NEWLOK: STANDING SEAM ROOFING
Newlok™ is a concealed fix, standing seam profile with an effective cover width of 445mm, and a rib height of 50.8mm. It is designed for use on low pitched roofs and can withstand high wind conditions in industrial, commercial and residential applications.
Safintra Newlok™, roll-formed in 0.50mm Colorplus® AZ150, unseamed/seamed, fixed to steel internal purlins at 1600mm, and steel ridge/eaves purlins at 1400mm centres using Newlok™ clips which must be positively fixed to purlins with Fixtite™ or Safintra approved wafer head self-tapping fasteners, all in accordance with the manufacturer’s recommendations.
The roof sheeting shall be manufactured by Safintra, roll-formed in continuous lengths and cut to length from Aluminium or Aluminium-Zinc coated steel.
The profile shall be roll-formed with 2 ribs of 50.8mm and a cover width of 445mm. Two stiffening ribs shall be incorporated in the pan.
Newlok™ Standing Seam Profile cannot be cranked.
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 Newlok® 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 and SANS 10160-3.
Newlok™ cleats are calculated at 110g per clip – You will require approximately 3 clips per m².
Purlin Spacing is dependent on both downward loading and negative suction loading caused by wind. An engineer should be consulted to calculate your load (kN/m2) for your particular application.
*refer to the Safintra Technical Department for more information
LENGTH AND ROOF PITCH
Newlok® 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 constrictions and building design. The minimum roof pitch when using Newlok® is 2° on steel and 3° on timber. Clip-in marks and oil canning might be visible on high pitched roofs or vertical applications. This visual effect might not be aesthetically pleasing in a residential application.
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.
A length variation range of +10mm and -0mm, and a width tolerance of ±3mm are permissible.
Seaming is recommended for Industrial and Commercial applications. To allow for thermal expansion, a 2-part sliding cleat is available for this type of installation. For residential purposes, an unseamed configuration is adequate due to reduced load requirements. A fixed cleat will be suitable for this application.
During installation, clean the roof daily by removing all swarf, pop rivets and unused fasteners or any other debris.
NEWLOK™ SINGLE-PART FIXED CLEAT
The Newlok™ fixed cleat is used to secure the Newlok™ profile to the purlins. These cleats are used on residential roofs where the sheets are not excessively long and thermal expansion is minimal.
- Starting with the female rib first, align the first row of cleats and fasten on all fastening positions.
- Roll the sheet over the cleats and lock the sheet into place.
- Engage and fasten the next row of cleats over the male rib. Repeat from step 2.
Concealed fix side cladding must be pierced fixed for prevention of sheet movement due to gravity. Pierce fix the bottom and top of the sheets. Internal pierce fixing may be necessary on longer sheets. Cladding is to be fixed in the pan of the sheet with #12x25mm Fixtite™ Fasteners - Class 4 only.
This flashing is positively fixed. Care should be taken when detailing industrial length sheeting and flashings due to thermal expansion.
SPECIALISED FIXING ACCESSORIES
All overhangs greater than 500mm require seaming. These include canopies, walkways, lean-to roofs, loading bays and decorative roofs. Overhangs are prone to a build-up of wind pressure and are considered to be the weak point of any roof.
Care should be taken when using the mechanical seamer that all 3 handles are engaged to ensure complete forming of the seam.
SPECIALISED FLASHING INSTALLATION
Safintra recommends the use of Flashing Slider Brackets for very long sheets. Please consult our Technical Department for assistance.
The Z-Support flashing is used to create a false rib in the pan of the Newlok™ profile. This flashing is fastened through the sheet into the purlins and sealed with a butyl or neutral cure silicone sealant. This flashing also creates a fixing platform for flashings. Other flashings are fastened to the Z-Support flashing at no more than 500mm centres.
Newlok™ Z - Support Flashing for Longitudinal Flashings
Newlok™ Z-Support Flashing for Transverse Flashings
The Z-Sliding Bracket is designed to slide with the thermal expansion and contraction of the roof sheeting. It is recommended for sheet lengths exceeding 20 metres.
Newlok™ Z-Sliding Bracket for Longitudinal Flashings
F10 SLIDING BRACKET
The F10 Sliding Bracket is designed to slide with the thermal expansion and contraction of the roof sheeting. It is recommended for sheet lengths exceeding 20 metres.
F10 Sliding Bracket for Transverse Flashings
NEWLOK™ 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 (tanking or turning up). The lipping tool is used on the eave side of the sheet to create a turned down lip (lipping or turning down).
Newlok™ bending tool application
Newlok™ lipping tool application