Gutter Systems

Eaves Gutters

Eaves gutters are outside of the building and pose less of a problem, potential overflows can be addressed with the introduction of weirs. When specifying a guttering system it is important to remember that the gutters are subject to relatively severe conditions and the specifier must be careful to choose the correct materials, seals and coatings.

Aluminium

Aluminium has excellent corrosion resistance, however aluminium expands at a greater rate than steel and designers should build into the design a dilaprene expansion joint to allow for natural expansion and contraction of the aluminium. This means that the gutter should be allowed to float and not be fixed to a sub structure.
At the eaves aluminium gutters can be externally powder coated. All powder coated parts carry a Dupont or Synthapulvin warranty. For marine environments additional Marine Warranty’s are available.

Assembly of aluminium gutters - Aluminium eaves gutters can be fixed together with rivets or stainless steel nuts, bolts, washers and a suitable sealant. Aluminium valley gutters are usually site welded to produce one continuous length; this guarantees that there will be no joints where potential leaks can occur. Expansion joints are also welded into the gutter run to ensure water tightness.

Stainless Steel

Stainless steel is very good for long life and corrosion resistance, grades 304 and 316 are recommended.

Assembly of stainless steel gutters - Stainless steel gutters are usually assembled similar to galvanized steel gutters, based on a joggled end that has holes pre punched to accept butyl mastic and stainless steel nuts, bolts and washers. A rubber washer should be placed between the stainless steel washer and the gutter face to avoid electrolytic reaction.
As with aluminium, stainless steel gutters can be site welded, but dilaprene expansion joints will be required.

Membrane

PVC and EPDM membrane linings bonded to a steel substrate are now becoming more popular with contractors due to the heat-welded joint and the durability of the membrane finish. These products have a life expectancy in excess of 35 years and can be provided with a specific project warranty of up to 20 years.

Assembly of membrane gutters - Membrane gutters are becoming more and more successful due to the ease of installation and jointing. Membrane gutters employ the same methods as flat roofing in that the joints are heat welded to ensure a water tight seal. Products such as Raintite which uses the fatra membrane, offer a flap over detail that eliminates 50% of welding. Raintite also offers a unique durable slip resistant surface.

Membranes are 1.2mm thick bonded to 1.2mm galvanised steel substrate, giving a highly durable product with a weather resistant surface. Membranes offer excellent colour stability as well as resistance to ultraviolet light, heat and harsh weather conditions, including ponding and general wear and tear.
A major benefi t is that membrane gutters are easily repaired by heat welding a membrane patch over the problem area.

Gutter Flow