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SLATE PANELS
Slate panels, for roof pitches from 12° to 90°.
Britmet Slate 2000 1250mm x 369mm light weight roofing slate panels have been
designed to emulate natural slates and MUST be fixed with a broken bond and
fixed right to left. Manufactured and supplied by Britmet Tileform Limited.
To secure the 0.45mm Slate panels, 4no. coloured 2.6mm x 50mm galvanised fixing
nails per panel should be driven through the downturned face of the slate panel
ensuring penetration through the batten is made. (For 0.9mm Slate, a coloured
TEX screw can be used (Part No. ASf2 - 00E55).
The second course of slate panels and each course thereafter, to be laid with
a broken bond to conform with the interlocking design of the slate.
BATTENS
Slating battens of approved treated quality of suitable section, (see table
1). To be laid at 369mm centres, except the eaves batten (see eaves), and secured
to the rafters using galvanised nails, or 367mm centres for 0.9mm.
Joints in battens to meet half way across top face of rafters and be staggered
as per standard code of practice.
UNDERLAY
Approved reinforced felt to BS747 (type 1F) to be laid over rafters and lapped
in accordance with current regulations (see tables 2 & 3). Felt must be
allowed to exceed into gutters and be secured to the rafters with galvanised
clout nails.
ANGLE RIDGE
To be manufactured and coated in identical material to main roof covering.
Two slate battens to be fitted side by side on both sides of the ridge, using
galvanised nails. An additional 38mm x 38mm ridge batten to be secured on top
of the rearmost of the two slate battens in a position to suit the fitting of
the angle ridge.
The top course of slate panels to be bent and cut if necessary, using a bender
and guillotine (available from Britmet Tileform Ltd). The back edge of the slate
panel to be turned up to form a 25mm to 38mm upstand against the top slate batten.
Each slate panel to be secured using four nails driven through the downturn
nose of the slate panel into the battens.
The ridge cap to be fitted over the top batten and nailed through the downturn
of the ridge cap into the slate panel upstand and face of the batten, using
five nails on each side.
ANGLE HIP FLASHING
A 38mm x 38mm batten to be nailed to the slate battens, on each side of the
hip, using galvanised nails.
Slate panels to be cut and bent up against the battens, using a guillotine
and bender (Available from Britform Tileform Ltd).
The hip caps to be fitted over the battens and nailed through the downturn
into the face of the battens, using five nails on each side.
ANGLE RIDGE (VENTILATED) - ROOF PITCHES FROM 12° to 35°
Felt underlay to be cut back at the top edge allowing a continuous 12.5mm air
gap on either side of the centre line of the ridge.
The top course of slate panels to be bent and cut if necessary, using a bender
and guillotine (Available from Britform Tileform Ltd).
Each slate panel to be secured using four fixing nails driven through the downturn
nose of the slate panel into the battens. A batten, not exceeding 38mm x 38mm
to be fitted on the universal vent filler (supplied by Britmet Tileform Ltd)
and secured through the slate panel into the battens on the underside, using
75mm galvanised nails.
The ridge caps to be fitted over the batten and nailed through the downturn,
into the face of the batten using five nails on each side.
EAVES
The bottom course of slate panels to be secured with four, coloured galvanised
2.6mm x 50mm nails driven vertically through the high point of the slate panel
profile, into the fascia board, or through the eaves batten. Eaves batten to
be placed approximately 20mm behind the fascia board if the Britmet eaves ventilation
system is used. These nail heads to be sealed using Britmet finishing kit. The
top of the fascia board, or eaves vent, is used, to be in line with top of the
battens. Fit lay board, or tilting fillet at the eaves, if appropriate, to ensure
any moisture on the underlay drains into gutter.
EAVES VENTILATION
The top half of the fascia board to be set 15mm below the top face of the eaves
batten for the 10mm eaves vent pack. Britmet over fascia ventilators to be fixed
to the fascia board and Britmet over insulation airflow units to be installed
between rafters.
Roof pitch below 15°
The top of the fascia board should be fixed 25mm below the top face of the eaves
batten allowing for Britmet 25mm eaves vent system.
VALLEY
Valley to be formed from metal sheet (lead) or moulded glass fibre or similar
approved lining, supported on valley boarding. Adjacent slate panels to be measured
and cut, allowing sufficient downturn, as detailed in the manufacturers instructions.
Battens to project over valley to provide fixing for slate panels.
BARGE BOARD COVER
The timber barge board should project 25mm above the top of the slate battens.
A 25mm x 38mm timber batten to run parallel to the fascia board. Slate 2000
panels should be cut and bent up against the timber barge batten.
The Slate 2000 scribed barge board cover to be secured using five fixing nails
driven through the downturned edge into the barge board and five nails to be
driven vertically into the barge batten (the heads of the vertically fixed nails
need to be sealed, using Slate 2000 finishing kit).
SIDEWALL FLASHING
B ritmet side-wall flashing to be secured with fixing nails, one driven vertically
into each batten (these nails need to be covered, using Britmet finishing kit).
Britmet cover flashing to be dressed over edge of side flashing abutting wall
and let into brickwork.
SLATE 2000 INLINE SOIL AND INLINE SLATE VENT
To provide additional ventilation, the Britmet inline vents are available providing
an airflow of 7,500mm2. The slate underlay must be cut to allow the
spigot of the slate vent to pass through and 100mm above this penetration point,
an opening protector (included with slate vent) must be installed to provide
full weather security.
The slate vent is secured by overlapping a Britmet Slate panel either side
and nailing through the nose of the slate panel. Nails must not penetrate the
vent slate.
The Britmet inline vent slate can also be used as a weather protected exit
point for soil pipes or extractor fan ducts by means of a separately available
flexi hose and pipe adapter that connects the vent to 100mm stacks or duct work.
SLATE 2000 GAS FLUE RIDGE TERMINAL
Available to suit angle ridge only. Type (R) adapter and extension piece supplied
by others.
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