FloPlast Half Round 112mm Gutter

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Half Round (112mm) Gutter Parts from FlowPlast (Choice of component and colour)... more
Product information "FloPlast Half Round 112mm Gutter"

Half Round (112mm) Gutter Parts from FlowPlast

(Choice of component and colour)

Rounded bottom lets water run freely!

Small and discreet half round gutter is a popular profile for roofs that have low to medium rainwater runoff. This 112mm x 52mm FloPlast version is compatible with most other half round rainwater gutter systems.

The FlowPlast guttering, carry the British Standard Institute (BSI) Kitemark, and are manufactured to BS EN 12200-1 using best quality PVC-u, and the system also meets the requirements of BS EN 607, and BS EN 1462.

Features & Benefits

  • Shallow curved profile - discreet appearance
  • Good flow capacity - 0.92 to 1.17 litres per sec
  • Pre-fitted gasket and clip - reliable water sea
  • Easy-fit gutter parts - simply clip together
  • Clear water flow - smooth curved bottom
  • 10 year guarantee - performance you can trust

The shallow style of FloPlast Half Round gutter provides low to mid-level flow capacity, and is suitable for both old and new domestic, or small commercial properties.

The FloPlast Half Round 112mm Ogee Gutter System

Floplast Half Round 112mm gutter and components

Did you know? For larger roof areas that require greater capacity, our Square Line and Niagara ogee profile guttering with their increased flow capacity can be used. Flow capacity can be compared within our Gutter Flow Rate table below.

In this listing you can buy...

Gutter Union

Picture of FloPlast Half Round Gutter Union

Straight union joint for inline connections of half round gutter lengths over long spans.

90° Corner

Picture of FloPlast Half Round 90° Corner

Inward and outward facing right-angle corner for houses and Edwardian conservatories.

135° Corner

Picture of FloPlast Half Round 135° Corner

Angle joint for corners of standard Victorian conservatories and 3-sided household bays.

Running Outlet

Picture of FloPlast Half Round Running Outlet

Connects lengths of half round gutter whilst providing an outlet for rainwater downpipe.


Picture of FloPlast Half Round Stopend

Simply clips to the end of half round gutter length to close and provide a gasketed water seal.

Internal Stopend

Picture of FloPlast Half Round Internal Stopend

Fits on gasket and clip sockets to create a stopend on unions, corners and outlets.

Stopend Outlet

Picture of FloPlast Half Round Stopend Outlet

Closes the end of half round gutter and provides an outlet for your rainwater downpipe.

Fascia Bracket

Picture of FloPlast Half Round Fascia Bracket

Screws to fascia board and wraps around underside of gutter for a strong, secure hold.

Gutter Clip

Picture of FloPlast Half Round Gutter Clip

Wraps around unions, corners, stopends etc, to provide a strong watertight guttering joint.

Gutter Gasket

Picture of FloPlast Half Round Gutter Gasket

Rubber seal for replacing perished or missing gaskets of FloPlast half round gutter parts.

Technical Information

The following provides information about the FloPlast 112mm Half Round gutter system.

Gutter Size (w x h x l) 112mm x 52mm x 4m
Component Size Please refer to picture diagrams for size of individual parts
Compatibility Suitable for use with most 112mm x 52mm half round gutter systems, and 68mm round downpipes.
Application Domestic rainwater system for homes, conservatories, and small commercial properties.
Material PVC-u (Un-plasticised Poly Vinyl Chloride)
Colour White, Black, Brown(suits Rosewood or Mahogany frames),and Anthracite Grey
Quality and Standards The FloPlast Niagara, Half Round and Square Line products are manufactured under a quality management system assessed and registered as meeting BS EN ISO 9001:2000, and carry the British Standard Institute (BSI) Kitemark (KM501316), having passed the requirements of: BS EN 607: 2004 (Gutters and fittings)
BS EN 12200-1:2000, BS EN 1329-1:2014 and BS 1453-1:2000 (Downpipes and fittings)
BS EN 1462: 2004 (Gutter brackets)
Fire Resistance FloPlast gutters, pipes and fittings are manufactured in PVC-U, which is not easily ignitable and will not support combustion.

Gutter Flow Rate

When planning rainwater guttering, be sure that the flow rate of the configuration exceeds the calculated runoff from the roof. We have created a How to Measure Roof Rainwater Runoff blog post that can help calculate the runoff for a standard mono-pitched roof.

End Outlet in Gutter

SystemDownpipeGutter LevelGutter with Fall (1:350)
Gutter Flow
Roof Area
Gutter Flow
Roof Area
Half Round68mm Round0.92441.1756
Square Line 65mm Square 1.7 81 2.00 96
Niagara 65mm Square 2.4 115 2.90 139

Centre Outlet in Gutter

SystemDownpipeGutter LevelGutter with Fall (1:350)
Gutter Flow
Roof Area
Gutter Flow
Roof Area
Half Round68mm Round1.80862.60125
Square Line 65mm Square 3.41 163 3.95 189
Niagara 65mm Square 4.50 216 5.30 139

From this we can see that a centre outlet almost doubles drainage so is more efficient and could mean less outlets required.

Fitting and Usage

The following is offered as a simple overview of fitting FloPlast gutter to a standard domestic fascia. For detailed advice, please refer to the step-by-step or detailed fitting instructions.

  1. Plan the installation with gutter system and components based on the design and flowrate of your roof.
  2. Position running outlet directly over the drain, and fit no more than 50mm below the level of the roof tiles.
  3. Fit a bracket 100mm short of opposite end from outlet, and tie a plumb line to it, with the string from the top face of the bottom, where the gutter rests.
  4. Stretch the plumb line and tie to the outlet, with the string on top face where the gutter rests.
  5. Check that there is a fall towards the outlet of 1:350 to encourage efficient drainage.
  6. Measure, mark and fix brackets along the fascia, using the plumb line for vertical position.
    • Maximum spacing of 1m for Half Round and Square Line, and 800mm for Niagara ogee.
    • Maximum spacing of 400mm in areas of heavy snowfall.
    • Fit no further than 150mm from any joints, such as unions, corners and stopends.
    • Use 25mm x 5mm roundhead brass or zinc screws to secure brackets.
  7. Fit gutter lengths, starting from the outlet, then adding unions and other parts as you go.
    • Ensure gutter overlaps joints to the insertion marks stamped on gutter parts.
    • Fit parts to gutter ends before screwing part to fascia.
    • Fit gutter lengths back to front by tilting the back edge under the back clip, and snap in at the front.
    • Use of a lubricant, such as silicone grease, on gasket seals can ease fitting and improve performance.
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