ROOFING ACCESSORIES DESIGN
Home / Products Gallery / Roofing Accessories Design
PERFORMANCE:
Stramit® Rainwater Products have been designed and/or tested to all appropriate loadings and design action effects. These include wind, atmospheric corrosion, rainwater flow, rainwater mass, foot traffic loads, dead loads and ladder loads.The performance information for each product indicates those action effects accounted for in each case.
RAINFALL INTENSITY:
Values of rainfall intensity in the table and maps are for 20 year ARI, 5 minute durations and have been derived from AS3500 part 3.2 ‘Stormwater drainage – Acceptable solutions’. It should however be emphasised that the extent and longevity of records in Australia are limited and any such data therefore carries with it a degree of uncertainty.The 20 year ARI values should only be used for external eave gutters. For internal/box gutters use 100 year ARI values such as those in the Stramit Design Guide – ‘Roof Slope’.
| 20 YEAR RAINFALL INTENSITIES (mm/hr) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Northern Territory | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Queensland | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
The map is only intended to indicate the variability of rainfall intensity within the region shown. Specific data for any location can be obtained from the Commonwealth Bureau of Meteorology in Melbourne.
| SOUTH EAST QUEENSLAND – 20 YEAR RAINFALL INTENSITY ISOPLETHS |
|---|
 |
HAIL:
Stramit® Steel Gutters are able to resist impact from significantly sized hail without damage. However, in hail prone areas consideration should be given to ensuring that gutter fronts are well below roof level.This should avoid the damming effect of hail which, if it builds up onto the roof, can lead to overloading and failure of the gutter.
LEAVES:
The problem with leaves in gutters is difficult to solve. Leaves come in many shapes and sizes and roof debris usually extends to branches and twigs. Many systems have been and are used to purportedly solve this problem but, in our view, none are able to satisfactorily do so.
The most popular solution is a mesh gutter covering. Those of a very fine mesh are prone to dirt and algal build up potentially leading to mesh blockage. This does keep leaves from the gutter and downpipe, but ultimately it will not allow water to pass into the gutter. The ensuing micro-atmosphere within the gutter can be corrosive and lead to a reduction in durability. Larger mesh guards only stop large leaves and branches from entering the gutter. In these cases it is possible for twigs and branches to catch in the mesh ultimately creating a dam above the mesh. In extreme cases this can then prevent leaves from passing causing water to flow back into the building eaves.
Stramit does not recommend the use of leaf guards. The best solution is to use adequately sized gutters set well below the roof edge with a good fall and large downpipes with well angled offsets to avoid corner blockages.
COMPANY DETAILS
Phone: 07 5439 0990
Fax: 07 5439 0770
Address:
26 Beerwah Parade
Beerwah, Sunshine Coast
QLD 4519, Australia
Postal Address:
PO BOX 147,
Mooloolaba, Sunshine Coast
QLD 4557, Australia
What’s New at Ascent
NSW Lic: #187568C
REQUEST FOR QUOTE
COLORBOND COLOURS
