Slates or tiles to match existing on 25x50mm battens on one layer sarking felt on 38x50mm rafters @ 400mm CRS with 38x50mm battens to U/S of rafters to maintain 50mm airgap within roof construction when incorporating 150mm fibre glass quilt insulation. 50x100mm ridgeplate shot fixed to T/S ridge beam. 50x100mm wallplate securely strapped down to wall using 5x30mm galv ms straps by Cullen or equal @ 1200 mm CRS. 100x25mm diagonal bracing positioned both sides of roof. 38x100mm collar ties @ 400mm CRS. 50x250mm hip rafters. TG and V redwood sheeting ceiling painted w/Class 1 SSF varnish. All structural timber to be C16 or greater and must be stamped accordingly.
- Roof Anchorage - First rafter and collar tie to be bolted to main wall at 450mm CRS using Rawl bolts or similar proprietary fixing.
- MS support posts and factory fitted baseplate to be bolted down on top of solid footings built up to 300mm below finished floor level.
- Wracking resistance provided using 9mm plywood secured to U/S of rafters and collar ties prior to any decorative finishes.
- Where a raised or vaulted ceiling is required an IG Ridge Beam Cradle must be used.
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Provide 150mm fibreglass
quilt insulation between roof rafters and collar ties. Insulation to
be carried over top of cavity wall and pushed into soffit box to prevent
a cold bridge. Install Cullen G400 eaves ventilators to providen a continuous
air path for roof space ventilation between roof and insulation and
roof underlay at eaves equivalent to 10,000mm2/m w/Culllen G1200 over
facia ventilator to provide ventilation to roof space equivalent 10,000mm2/m
in accordance w/Bld. Regs. Approved Document F2 1995 and or BS 5250:
1989. Fixed in accordance w/manufacturers instructions. |
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Provide stepped cavity tray
across wall directly above Code No.4 flashing, where new roof abuts
wall. Note all lead to be treated w/patination oil. Rainwater goods
facia and soffit to match existing. RC cill w/DPC @ rear, ends and under.
Wall DPC located min. 150mm above ground level. 300mm solid blockwork
footings. |
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250mmx600mm concrete foundation.
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Form new opening from existing
dwelling into Sun Lounge to client's requirements. |
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Provide vertical DPC where
Sun Lounge window abuts existing wall. Where new wall abuts existing,
new cavity to be continuous w/existing cavity. Provide 35mm polystrene
insulation between MS post and against inner leaf where post is inside
cavity, to prevent a cold bridge. All glazed panels to doors and side
panels w/glazing less than 1500mm above floor or ground level to be
glazed w/safety glass to BS 6206: Class B and C. |
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Provide 300mm cavity wall
construction with 60mm Rigid Polystrene Insulation - Wall ties w/insulation
clips to be spaced 750mm horizontal and 450mm vertical CRS. Form new
external steps @ doorway to comply w/current Bld. Regs. Any new heating
pipes to be insulated w/an insulation of thickness of not less than
the diameter of the pipe - insulation to BS 5422:1977. |
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Provide 100mm dia stormwater
drain, laid to fall 1:60, drain pipe to be surrounded w/150mm pea gravel.
All drain pipes to comply w/BS 4660 - connected to existing system.
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Specification:
IG L1/HD factory fabricated Sun-lounge lintel - mitred and welded c/w factory fitted location spigots for easy installation - on MS posts designed by IG Technical Department c/w 10mm thick Base Plates secured to solid footing 300mm below finished floor level.
On large Sun-lounges and in exposed locations the IG Inverted Support Frame is supplied as specified by IG Technical Department.
