At Aluminium Rainflow we offer 5 sizes of aluminium box gutter from 100x75mm up to 200x150mm.
Formed from high strength aluminium sheet grade 1050AH14 in various sizes & profiles, with a full range of accessories including angles, outlets, stopends, fascia brackets, rafter brackets and rise&fall brackets. True and Faceted radius gutters are also available.
Aluminium joggle box gutters have fascia brackets which are set out at 750mm maximum centres no further than 375mm from a joint, please also allow 1 extra bracket per fitting. The fascia brackets should be set out to any predetermined 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). 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.
Box gutters are supplied pre-drilled on the back face at 750mm centres. See Fig 1. The gutter can be installed horizontal or to a predetermined fall to each outlet. (e.g. 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 coefficient 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. Aluminium Rainflow 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. 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 the plain end of the gutter (Fig 2.),position the adjoining gutter spigot over the prepared joint.. Carefully insert the bolts, applying sealant to the thread & round the slot in the union, fit 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. Touch up paint is recommended to touch up all site cut ends.
Our gutters are powder coated to a range of colours, the most popular colours are available to select through our online store. If you require a RAL or BS colour we haven't listed on our website then contact us for a quotation. We can quote for any RAL or BS colour, it doesn't always cost extra so please don't hesitate to ask.
You can see our range of aluminium box gutters in our online store.