TRIMFLUTE
Trimflute® is a subtle square fluted profile. The flute and discrete stiffening ribs in the pan give the profile its strength as well as its long spanning capabilities. Trimflute® can be used as a roofing as well as a cladding profile. The square flutes of Trimflute® ensure excellent drainage characteristics. The contemporary appearance of Trimflute® is aesthetically appealing.
SAMPLE SPECIFICATION
Safintra 0.50mm thick, Zincal® AZ 150 Trimflute® profile roof sheeting, fixed to internal steel purlins at 1700mm centres and to ridge and eaves purlins at 1500mm centres, with Fixtite™ or Safintra approved #12 x 65mm hex head self-drilling screws at every second crest, internal purlins at every crest. Eave purlins side laps to be stitched at 500mm centres between purlins with #14 x 22mm metal stitching fasteners, all in accordance with the manufacturer’s recommendations.
The sheeting shall be Trimflute® type profile as manufactured by Safintra. The profile shall be roll-formed with 6 trapezoidal ribs at 203mm centres with a net cover of 1015mm. The rib height shall be 28.5mm and shall be fixed in accordance with the manufacturer’s recommendations.
MATERIAL OPTIONS
NOTE 1
When installing Trimflute® 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
Trimflute® does not get cranked in South Africa.
NOTE 3
During installation, clean the roof daily by removing all swarf, pop rivets and unused fasteners or any other debris.
NOTE 4
Trimflute® is a handed sheet with a capillary break on one side and should be installed accordingly.
NOTE 5
All sheets are to be tanked or turned up at the ridge side of the sheet and are to be lipped or turned down at the eave end.
PURLIN SPACING
LENGTH AND ROOF PITCH
When using Trimflute® sheeting the recommended minimum pitch for roof slopes in excess of 15m is 10° and for slopes less than 15m is 7.5°. Trimflute® sheeting can be ordered in any length, subject to transport limitations, up to 13.2m. Longer lengths require special transport arrangements.
Dimensional tolerances
A length variation range of +10mm or -0mm, and a width tolerance of ±5mm is permissible. This applies to straight sheet lengths only.
Note 6
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 bimetallic corrosion, and the service life of the Aluminium will be compromised.
*Refer to the Safintra Technical Department for more information or raise any enquiries in writing to info.safintrasa@safalgroup.com
FIXING GUIDE
Trimflute® is pierce fixed to timber or steel supports. This means that fastener screws pass through the sheeting. Always drive the fasteners perpendicular to the sheeting, and in the centre of the rib.
It is recommended that side laps be stitched at 500mm centres. It’s further recommended that every rib is fixed at the eaves, ridges and the apex of the roof. The rib of Trimflute® with the capillary groove is always the underlap. It is generally considered good practice to use fasteners alongside laps. Side and end laps are to be sealed (in accordance with SANS10400-L:2020) using a suitable butyl product or neutral cure Silicone.
FASTENERS FOR TRIMFLUTE®
FLASHINGS AND SIDE STITCHING
NOTE 7
Safintra recommends the use of Fixtite™ fasteners. Refer to Corrosion Class table under Fixtite™ Fasteners.
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