Moulded No. 46 Ogee Cast Aluminium Guttering

The Moulded No.46 O.G Cast Aluminium Gutters come in various sizes (100mm x 75mm, 125 x 100mm & 150 x 100mm) & are supplied with a complete range of accessories ie angles, outlets, stopends, fascia brackets.
True and Facetted radius gutters are also available.


Moulded No.46 O.G Gutters have fascia brackets which are set out at 915mm maximum centres no further than 300mm from a joint,please also allow 1 extra bracket per fitting. The fascia brackets should be set out to any pre-determined fall taking note of the position of any fittings such as outlets and angles beforehand, brackets should be fixed using 5mm x 25mm stainless steel countersunk screws (dependant on substrate).See Fig 1.
Rafter brackets are also available whose centres may be governed by the roof timbers. Rise and fall brackets driven into the masonry are recommended to be at 915mm maximum centres.

Direct Fixing:

It is possible to directly fascia fix Moulded No.46 gutters using 5mm x 25mm stainless steel screws (dependant on substrate) without additional support, although care must be taken to keep fixing through the back face above the waterline, as below this it may effect the calculable, leak free, capacity of the gutter.
Where a gutter sits upon a cornice or cill, it is advisable to have a damp-proof membrane behind and below the gutter.
Fixing centres for “Legacy” Cast Moulded No. 46 Aluminium Guttering is 915mm.


Aluminium has a coeffi cient of expansion equal to 0.00002348mm per °C on average, this equates to just over 1.4mm per metre on a temperature range of -20°C to +40°C. Typically a 3mm to 4mm expansion gap between the ends of the gutter sections is advisable.

ARP recommend & supply Arbosil 1096 Low Modulus Silicone sealant and it is essential that this or a direct equivalent is used to seal the joints as this will ensure a strong mechanical bond that withstands the forces associated with thermal movement.
It is important to observe the sealant manufacturers guidelines concerning application and curing during cold or damp weather conditions & that before assembling the joint all surfaces are clean & free from grease, acetone applied with a soft cloth and wiped dry is recommended.

Cast Moulded No.46 O.G. gutters have a Spigot arrangement that are secured using M6 x 30mm aluminium bolts, neoprene washers and nuts.
Having sited the gutter, apply 2 x 6mm beads of Arbosil 1096 Low Modulus Silicone sealant to the gutter socket. (Fig 2.).The two surfaces can then be brought together, the bolt inserted applying sealant to the thread and round the slot in the union, tighten the joint until some sealant emerges and a feeling of resistance is achieved leaving a 3mm sandwich of sealant. Excess sealant should then be removed. Touch up paint is supplied to touch up all site cut edges

Moulded No 46 Cast Gutter JointingFig 2.

Composition and Manufacture:

‘Legacy” Moulded No.46 O.G. Gutters are manufactured from Aluminium alloy LM27 to BS1474: 1972 & the product complies to, or exceeds all relevant standards. Special fittings for the gutters using fabrication methods involving cut, mitre and welding techniques can be provided.

Note:100x75mm & 125x100mm ranges are left hand systems; 150x100mm range is a right hand system.


Mill Finish Aluminium or Polyester Powder Coated to a range of BS or RAL Colours.

Model Specification:

ARP heavy grade ‘Legacy’ Gutters and fittings to BS 2997 (EN612) using LM27 alloy aluminium in accordance with BS 1474: 1974. Profi le to be Cast Moulded No.46, size 100mm x 75mm (3.5mm), 125mm x 100mm (3.5mm) & 150 x 100mm (3.5mm). Materials to have factory applied Polyester Powder Coat to all significant surfaces in accordance with BS EN 122026 Matt/Satin/Gloss* finish, or alternatively plain aluminium Mill Finish. All to be supplied by Aluminium Roofline Products Ltd, Unit 2, Vitruvius Way, Meridian Business Park, Braunstone, Leicester LE19 1WA. Tel 0116 2894400 Fax 0116 2894433.
Joints to be loose union connector sealed by application of Arbosil 1096 Low Modulus Silicone Sealant and fastened by M6 x 30mm bolts, neoprene washers and nuts in accordance with the manufacturer’s specifi cation & guidelines. Gutter to be fixed by fascia brackets at 915mm centres with supplementary brackets at or near fittings. Fixing for brackets to be 5mm x 25mm countersunk / domed head stainless steel screws (dependant on substrate)

Moulded No. 46 O.G. Gutter Technical Guide