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Half Round Gutter
3
Wednesday, 21 October 2020 / Published in Blog, Roofing

Half Round Gutter

HALF ROUND GUTTER QUICK LINKS
Features & Benefits
Colour Options & Finishes
Materials
General Information
Sizes
Lengths
Technical Information
Materials
Compatibility
Gutter Fall
Spans
Rainfall Intensity
Gutter Capacity
Half Round Gutter Brackets
Downpipes
Effective Cross-Sectional Area & Downpipe Size
Accessories
Buy Half Round Gutters

No1 Roofing manufactures and supplies a wide range of half round gutters. 

With sizes from 150mm diameter to 450mm diameter – in standard lengths as well as custom cut lengths up to 8 metres. 

The smooth pressed, non-segmented profile eliminates square corners and prevents the build-up of water and dirt.

The curved base of the profile creates a faster flow of water, as the water is channeled to the centre of the gutter, maximising drainage performance.

Half-Round Gutters are manufactured from 0.55mm bmt

Features & Benefits

  • High water-carrying capacity
  • Smooth pressed, non-segmented profile eliminates square corners and prevents the build-up of water and dirt
  • Curved base of the profile creates a faster flow of water as the water is channeled to the centre of the gutter, maximising drainage performance.

Colour Options & Finishes

Standard No.1 Roofing & Building Supplies Half-Round Gutters are manufactured from 0.55mm bmt ZINCALUME® and COLORBOND® material.

Heavier gauges of ZINCALUME® as well as stainless steel are also available, in plain profiles without the front bead.

Available in ZINCALUME® and COLORBOND® and stainless steel material

General Information

Sizes

Half round gutters sizes are from 150mm diameter up to 450mm diameter.

Lengths

No1 Roofing Half Round Gutters are supplied cut to length up to 8 metres.

Technical Information

Materials

  • COLORBOND® Steel – full range including ULTRA, MATT, METALLIC & STAINLESS STEEL
  • ZINCALUME® Steel
  • Galvanised Steel
  • Stainless Steel – 304 GRADE & 316 GRADE
  • Copper
  • Aluminium
  • Other – please enquire

Compatibility

All building products need to be checked for compatibility with adjacent materials, whether they are part of the current project, pre-existing or planned building elements.

Contact No.1 Roofing & Building Supplies for more detailed information.

Gutter Fall

A gutter fall of not less than 1:500 is recommended.

Spans

The Brackets are manufactured from 3mm Aluminium - 5005H34 GRADE - (and powder coated to suit) with a fold over tab at the front and a fold out / hook tab at the rear to hold the gutter in place.

Gutter Diameter (mm)

Max. Bracket Spacing (mm)

150

1200

200

1200

225

1200

250

1200

300

1200

350

900

400

900

450

900

Rainfall Intensity

Values of rainfall intensity in the table and map are for 20 year ARI, 5 minute durations and have been derived from AS3500 part 3 ‘Stormwater drainage’.

Note that rainfall records in Australia are limited and any data carries a degree of uncertainty. The 20 year ARI values should only be used for external eaves gutters.

For internal / box gutters use 100 year ARI values.

20-Year Rainfall Intensities for NSW (mm/hr) - Design rainfall intensities adapted from NCC, Volume 2, Table 3.5.2.1.

Region

ARI once n 20 years mm/yr

ARI once in 100 years mm/hr

ACT



Canberra

143

193

  Gungahlin

137

179

  Tuggeranong

148

210

New South Wales



Albury

139

180

Broken Hill

143

219

Goulbourn

121

156

Kiama

226

319

Newcastle

226

319

Orange

142

186

Sydney

200

262

  Avalon

206

278

  Campbelltown

167

222

  Penrith

180

244

  Windsor

175

233

Tweed Heads

252

330

Wollongong

217

308

Gutter Capacity

For any given roof area the larger the gutter, the fewer downpipes required. The Table below acts as a guide.

Catchment area calculations must take the roof slope into account. For slopes up to 23 degrees, only a simple plan area of the roof is required.

Half Round Gutter Downpipe Design Guide

The selection of the number of downpipes is carried out in accordance with AS3500.3 (Stormwater Drainage).

For Half-Round Gutters larger than 225mm in diameter, hydraulic design must be carried out by a suitably qualified person to determine the number and size of downpipes required.

Half Round Gutter Brackets

Half Round Gutter Brackets

Heavy duty type A4 brackets are manufactured in aluminium with a powder coated finish for all size gutters.

Downpipes

Downpipes must have sufficient capacity to allow for gutter drainage. 

They can be manufactured in all materials in lengths up to 4 metres (90mm and 225mm diameter) and all downpipes are tapered.

For larger diameter downpipe, please contact us and we will advise.

Effective Cross-Sectional Area & Downpipe Size

Gutter Size (mm)

Effective Cross Sectional Area* (mm)

Round Downpipe Diameter (mm)

100

2900

65

150

7300

100

200

13,700

150

225

17,600

150

250

22,000

TBD

300

32,300

TBD

350

44,600

TBD

400

58,800

TBD

450

75,000

TBD

* Area for Half-Round profile. TBD – Downpipe size to be nominated by hydraulic engineer.

Half Round Gutter Downpipes

Accessories

A full range of standard and custom rainwater heads and downpipes is available and can be fabricated from a wide range of materials to suit the No.1 Roofing & Building Supplies Half-Round Gutter.

A full range of standard and custom rainwater heads and downpipes

Buy Half Round Gutters

We stock a huge inventory of gutters, downpipes and accessories for every roofing project no matter how big or small.

Not sure what gutter you need,  you can call us for an estimate on the desired product.



Links and Downloads

  • No1 Roofing Half Round Gutter Specifications
  • Rainwater Downpipes
  • Rainwater Gutters
Tagged under: Brackets, clamps, metal roofing, roofing, s-5!

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