Beaded Half Round Aluminium Snap-Fit Guttering

Extruded Aluminium Gutters have increased in popularity over recent years due to their fine lines, clean cut appearance and robust properties. Being of a virtually pure alloy the corrosion factor is low which if supplied in a polyester powder finish (available in matt, satin or gloss) ensures a long, low maintenance life combined with an attractive appearance. ARP's Sentinal Range of Beaded Half Round Gutters come in profiles of 112mm, 125mm and 150mm either in a mill or polyester powder coat finish


Formed from extruded aluminium in various sizes (112mm, 125mm & 150mm) & is supplied with a complete range of accessories ie angles, outlets, stopends, fascia brackets. True & Facetted radius gutters are also available.


Beaded Half Round 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 fittings 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.


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 & 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.

Beaded Half Round gutters have loose internal union connectors that clip into recesses in the gutter extrusion. 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 offer the union connector into position & apply sealant to both sides of joint & tool in. Excess sealant should then be removed.

Aluminium Production and Recycling Process
Aluminium is one of the most readily available and sustainable materials used in construction today.

Products made from Aluminium are often made from a high quantity of recycled aluminium and can be readily recycled at the end of its useful life, needing much less energy to recycle aluminium than used in its intitial extraction and production process.

Aluminium that is manufactured today is a resource for the future. Across Europe, end of life recycle rates are greater than 95% for aluminium in the automotive and building industry.

Composition & Manufacture:

‘Sentinel’ Beaded Half Round Gutters are manufactured from Aluminium alloy 6063 T6 to BS1474: 1972 & 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 and forming tools.


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

Model Specification:

ARP heavy grade ‘Sentinel’ Gutters & fittings to BS 2997 (EN612) using 6063 T6 grade extruded aluminium in accordance with BS 1474: 1974. Profile to be Beaded Half Round, size 112mm (2mm),125mm (2mm), 150mm (3mm).

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 Roofl ine Products Ltd.

Joints to be snapfit union connector sealed by application of Arbosil 1096 Low Modulus Silicone Sealant in accordance with the manufacturer’s specification & guidelines. Gutter to be fixed by fascia brackets at 750mm centres with supplementary brackets at or near fittings. Fixing for brackets to be 5mm x 25mm countersunk stainless steel screws (dependant on substrate).
Click Here to see the Sentinel Gutter Technical Guide.