BROWNBUILT PROFILED SHEETING AND ACCESSORIES
SHEETING
The roof sheeting shall be interlocking concealed-fix "Brownbuilt"
profile roll-formed in continuous lengths and cut to length by a pneumatic
cut-off process from certified Z275/Z450/Z600 commercial quality galvanized
steel. The profile shall be roll-formed with three ribs at centres not
exceeding 203mm and a cover width not exceeding 406mm. These will include a
male and female rib. When interlocked, the minimum sheet depth shall be 48mm.
Each trough shall incorporate two stiffener ribs.
FINISH FOR "BROWNBUILT" ROOF SHEETING
The paint finish shall be a full top coat Classicoat Silicone Polyester
…….……SABS ……….. Code…………..and a half coat Classicoat Grey
to the reverse side.
FIXING BROWNBUILT
The "Brownbuilt" sheets shall be fixed to every purlin by means of
patented which will securely hold the sheets in position and lock-in both the
sidelap and centre ribs. The clips shall be manufactured from Galvanized steel
and shall be fixed to the steel purlin with two cadmium plated tek 3 no 10, 24
x 16mm long self-drilling/tapping screws, or with NA2 annular nails to timber
purlins.
"BROWNBUILT" 0,8MM THICK FLASHINGS
The paint finish shall be epoxy primer of 4-6 microns with a top coat
Classicoat Silicone Polyester of at least 22 microns and a half coat Classicoat
Grey to the reverse side (Colour to be approved by Architect).
Flashings shall be approved by "Brownbuilt Metal Sections" and
fixed to the sheeting with S1 clips to obviate any direct fixing perforations.
Prior to flashings being fixed, all troughs at the apex shall be stop-ended to
the full depth of the sheet in order to prevent any penetration of winddriven
water. The trough shall be lipped at the eaves end to form a drip.
Flashing flanges shall be notched to the sheet profile where necessary. All
these operations must be performed with special tools available from "Brownbuilt
Metal Sections". Care shall be taken to ensure that no sheeting or
flashing will be cut with abrasive disc on roof surface in order to prevent
steel spatter from penetrating colour coated areas.
GUARANTEE
The manufacturer shall comply with ISO9002 Quality Management System. "Brownbuilt"
sheeting shall be laid in strict accordance with the manufacturer’s
specifications by an approved contractor.
A written and approved five year guarantee of site-workmanship and
watertightness shall be issued after final inspection of roofs by the
manufacturer "Brownbuilt Metal Sections".
ERECTION
Every precaution shall be taken to prevent damage to roof sheets during all
stages of construction. Duck boards should be used when necessary to protect
the sheeting from damage. Sheeting which has become deformed or damaged in any
way, shall be replaced.
SAFETY
The contractor shall exercise special care when handling long length
sheeting, particularly in windy conditions. Should work be interrupted for any
reason, all loose sheeting and incomplete sections must be adequately secured
against possible movement by wind and gravity.
HANDLING AND STORAGE
The contractor shall ensure that all materials used on site for cladding,
etc are transported, handled and stored in accordance with the manufacturer’s
recommendations. Material damaged shall be rejected and replaced with undamaged
material at the contractor’s expense. Repair of damaged material will not
generally be permitted. Rates are to include for preventing damage and
protecting sheets through all stages of construction.
INSPECTION PRIOR TO INSTALLATION OR ERECTION
Before commencing installation, the contractor shall verify that the
following items have been checked and accepted:
- The entire structure or the portion thereof to be sheeted has been
correctly aligned, levelled and grouted.
- Purlins and sheeting rails are at the correct spacing and are within the
specified tolerances.
- The corners of the roof are square and the wall framework is perpendicular
or as specified.
- No protrusions such as bolt heads, splice plates, cleats, etc. appear on
the face of the framework.
- All members to which roofing and cladding are to be fixed in aesthetically
sensitive areas are true and square.
- Paint and any other materials that may be incompatible with the sheeting,
have been painted over or so dealt with that direct contact with the
sheeting is avoided.
- The contact faces between the purlins or the girts and the cladding are in
the same plane. Should the alignment be inadequate, the contractor shall
request instructions from the engineer before proceeding with the fixing of
the cladding.
PROTRUSION THROUGH SHEETED SURFACES
Protrusions such as pipes, ducts and the like, shall be adequately flashed
where they pass through the sheeting surface. Where ribs have to be cut away to
permit penetration, additional framing is to be installed as required to
support the sheeting.
Depending on the position of the penetration through the roof, special
attention shall be given to back flashing the sheeting to the ridge or point of
water entry. In all cases, all cutting and flashings shall be so arranged that
adequate provision is made for the drainage of all troughs and corrugation.
CLEANING OF ROOF, ETC.
All debris, swarf, etc arising from the fixing of the cladding shall be
removed from the sheeting as the fixing progresses. In addition, off-cuts of
insulation, surplus fasteners and sealants, mandrels from pop rivets, off-cuts
of flashings and sheeting, surplus flashing, food packaging, cartons, bottles,
cans, etc shall not be left on the roof or in the gutters.
Care shall be taken to ensure that no such material enters, blocks or
partially impedes the flow of water into the outlets, down pipes, etc.
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