Gutter Installation Manual
DPI Plastics - the market leader

DPI Plastics (Pty) Ltd is committed to professional standards and quality products like its Rainflo PVC-U Gutter System carrying the SABS mark of approval.
DPI Plastics strives to introduce leading edge technology and products with emphasis on cost-effectiveness, ease of installation and pleasing aesthetics.
Sales and distribution is provided through a network of business partners in South Africa and through its subsidiaries and joint ventures in Namibia, Botswana, Tanzania, Angola and Mauritius.


The Rainflo D-profile gutter was developed more than 20 years ago and has a proven track record in the gutter market. The system employs solvent weld fittings incorporating an innovative expansion joint for thermal movement.


  • SANS 11 compliant
  • Manufactured in ISO 9001 accredited factories
  • Utilising UV stabilised PVC-U materials which have been impact modified and are guaranteed not to discolour for 10 years


Downpipes 1 downpipe per 110m2 roof area
Couplings : 1 gutter expansion bracket for thermal movement, per 6m length of gutter and between corners more than 4m apart.
Brackets 1 every 750mm
Corners Use in conjunction with gutter expansion bracket

Prepare fascia to make sure it is level, vertical and painted.
Ascertain the appropriate fall of the gutter, either level or away from the corners and towards the outlets. The recommended fall is 1:600 (10mm for every 6m) on straight runs.
Follow the detailed instructions for solvent welding in this leaflet.

Position and fix the first and last bracket on each length of the system. Ensure that the correct fall is introduced at this stage. Brass or stainless steel screws are recommended

Stretch a line from the centre of the first bracket to the last bracket

Fix the gutter expansion brackets in the planned position and the correct height according to the line

Fix the remaining brackets in the same way: 750mm centre to centre.

Measure and cut the gutter profile to the correct length using the detailed instructions for expansion and contraction included with the gutter expansion bracket.

Mark and cut out the holes for the outlets.

Clip the back edge of the gutter into the brackets and lower the front edge over the ''arrow head'' clips and snap into place. Ensure that the expansion gap in the gutter expansion bracket is correct for the temperature at the time of installation. Snap the profile into both the front and back clips of the gutter expansion bracket.

Do not butt the gutter ends right up against the barge boards or parapet wall. Leave 20mm space for movement.



Use Freeflo non-pressure solvent cement to fix stop ends, round and square outlets, corners and repair couplings as follows:

  1. Clean the contact surfaces with solvent cleaner and a clean white cloth
  2. Apply an even layer of solvent cement to the contact surface of the fitting
  3. Clip the fitting into place immediately
  4. Excess solvent cement on the gutter will turn brown through UV exposure. Wipe off thoroughly.
STOP ENDS: (solvent weld)
When installing stop ends follow the solvent weld procedure above. Remember to leave a 20mm gap between the stop end and the barge board or parapet wall.

OUTLETS: (solvent weld)
Use the outlet as a template to mark the size and position of the outlet hole in the gutter.
Cut the hole, either round or square, using a holesaw or jigsaw and remove all the burrs.

Position the first bracket at least 300mm away from each corner to allow some movement. It is recommended that the gutter slopes away from the corners where possible to avoid the accumulation of water.

Follow the Solvent Weld procedure. When snapping into position ensure that both the inner and outer lips of the gutter are securely clipped over the corner fitting.

Use the solvent weld repair coupling for repairs or extensions to the gutter. Note that the Rainflo gutter expansion bracket can be used as a substitute for the repair coupling.

Round downpipes

Always fit the pipe into the socket of the offset bend in the direction of flow
Use at least 2 holderbats to secure the downpipe in position

Square downpipes

Always fit the pipe into the socket of the offset bend in the direction of flow

Use the square change piece in conjunction with an offset bend to change the direction of the downpipe

Use 1 holderbat and fix the shoe, using the fitted lugs, to secure the downpipe in position

Note: Do not solvent cement the downpipe components so that they can be removed for maintenance at a later stage.