FloPlast Gutter Downpipe

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  • FLO-2181-1003
  • RPS4W
  • Parcel XXL
  • Hardware > Building Materials > Roofing > Gutter Accessories
Rainwater Gutter Downpipe from FloPlast (Choice of style and colour)... more
Product information "FloPlast Gutter Downpipe"

Rainwater Gutter Downpipe from FloPlast

(Choice of style and colour)

Compatible with all 65mm and 68mm downpipe!

Lengths of uPVC plastic downpipe with choice of 65mm square and 68mm round rainwater pipe. Manufactured by FloPlast, compatible with other square and round downpipe, and guaranteed for durability and colour-fastness.

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

  • Choice of profile - round and square options
  • Quick and easy fitting - just push fits together
  • Highly compatible - fits other 65/68mm parts
  • Full downpipe system - all components available
  • 10 year guarantee - durable and colour-fast

For use with FloPlast’s Niagara, Half Round, and Square Line gutter outlet downspouts, and all other 65mm square and 68mm down pipe systems. Suitable for low to mid-level flow capacity, on both old and new domestic, or small commercial properties.

In this listing you can buy...

65mm Square

Picture of FloPlast 65mm Square Downpipe Rainwater Downspout

Plastic square profile (65mm x 65mm) rainwater gutter downpipe extrusion of 4m in length.

Dimensions of FloPlast 65mm Square Downpipe Rainwater Downspout

68mm Round

Picture of FloPlast 68mm Round Downpipe Rainwater Downspout

Plastic Round rainwater gutter downpipe extrusion of 68mm in diameter, and 4m in length

Dimensions of FloPlast 68mm Round Downpipe Rainwater Downspout

Technical Information

The following provides information about the FloPlast 65mm Square and 68mm Round downpipe.

Technical Information

 65mm Square68mm Round
Size (width x depth) 65mm x 65mm 68mm diameter
Length 4m (13ft 1in)
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 BS EN ISO 9001:2000, KM501316, BS EN 607: 2004, BS EN 12200-1:2000, BS EN 1329-1:2014, BS 1453-1:2000, BS EN 1462: 2004
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 Round 68mm Round 0.92 44 1.17 56
Square Line65mm Square1.7812.0096
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 Round 68mm Round 1.80 86 2.60 125
Square Line65mm Square3.411633.95189
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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