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Legion Pressed Aluminium Box Guttering "Joggle Joint"

ARP Joggle Joint Box Gutters are available in a variety of sizes and either Mill finish or Polyester Powder Coated.

Aluminium pressed box gutter systems have been providing robust, lightweight, low maintenance systems for commercial and industrial buildings for many years.

Legio Aluminium Box Gutters are formed from high strength aluminium sheet grade 1050AH14 in various sizes & profiles,with a full range of accessories ie angles, outlets, stopends, fascia brackets. True & Facetted radius gutters are also available.

How do I Install Aluminium Box Gutters?

Pressed box gutters have fascia brackets which are set out at 750mm maximum centres no further than 375mm from a joint or fitting. The fascia brackets should be set out to any pre-determined fall taking note of the position of any fi ttings such as outlets & 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 & fall brackets driven into the masonry are recommended to be at 600mm maximum centres.

Direct Fixing:

Box gutters are supplied pre drilled on the back face at 750mm centres. The gutter can be installed horizontal or to a pre determined fall to each outlet. (eg 1 in 60). Check existing fascia boards are suitably fixed and are structurally sound. Working from corners offer up the intermediate straight lengths and mark the fixing positions. Ensure all outlets are positioned correctly relative to the drains. Apply silicone sealant (Arbosil 1096 recommended) to the joggle joint. Using suitable fixings, (stainless steel recommended) position and fix length to fascia.Fix gutter together with M6 x 20mm screws, nuts and washers supplied.


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 (in certain situations Arbosil 1090 sealant may be preferrable, please consult technical department) & 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 & 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 & wiped dry is recommended.

Pressed box gutters gutters have integral union connectors (joggle joint) that are secured using M6 x 20mm aluminium bolts, neoprene washers & nuts. Having sited the gutter apply 2 x 6mm beads of Arbosil 1096 Low Modulus Silicone sealant to each side of the joint (Fig 2.).

Carefully insert the bolts, applying sealant to the thread & round the slot in the union, fi t the washers & nuts, gently tightening until some sealant emerges & leaving a 3mm thick sandwich of sealant between the union connector & the gutter. Excess sealant should then be removed.

Composition & Manufacture:

‘Legion’ pressed box Gutters are manufactured from Aluminium sheet 1050AH14 & the product complies to, or exceeds all relevant standards. Fittings for the gutters are formed using fabrication methods involving cut, mitre & welding techniques using specially made jig & forming tools.


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

Model Specification:

ARP ‘Legion’ Gutters & fi ttings to BS2997 (EN612) using 1050AH14 grade aluminium sheet. Profile to be box gutter, size 100x75mm (1.5mm), 125x100 (1.5mm), 150x100 (1.5mm), 150x150 (2mm), 200x150mm (2mm). Materials to have factory applied Polyester Powder Coat to all signifi cant surfaces in accordance with BS EN 12206 Matt/Satin/Gloss* finish, or alternatively plain aluminium Mill Finish. All to be supplied by Aluminium Roofl ine Products Ltd, Unit 2, Vitruvius Way, Meridian Business Park,Braunstone, Leicester LE19 1WA. Tel: 0116 2894400 Fax 0116 2894433. Joints to be joggle joint union sealed by application of Arbosil 1096 Low Modulus Silicone Sealant & fastened by M6 x 20mm bolts, neoprene washers & nuts in accordance with the manufacturer’s specification & guidelines. Gutter to be fixed by fascia brackets at 750mm centres with supplementary brackets at or near fi ttings. Fixing for brackets to be 5mm x 25mm countersunk stainless steel screws (dependant on substrate).

ARP Box Aluminium Gutter Technical Guide

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