Ogee Gutter Installation
Complete guide to fitting Kalsi Klassic or Krown ogee guttering with matching union brackets and 68mm round downpipe.
Safety Warning — Working at Height
Plan and risk-assess all work at height. Use a suitable working platform with collective fall protection where reasonably practicable. A ladder should only be used for low-risk, short-duration work where the assessment shows that equipment offering greater fall protection is not justified. Inspect and secure access equipment, keep three points of contact, do not overreach, and keep the area below clear.
What You'll Need
Tools
- Tape measure (minimum 5m)
- Spirit level or laser level
- String line and chalk line
- Hacksaw with fine-tooth blade
- Drill/driver with pilot bit
- Flat file and deburring tool
- Scaffold tower or secure ladder
- Pencil and permanent marker
Materials
- 130mm Klassic or 137mm Krown ogee gutter lengths (4m)
- Matching Klassic or Krown fascia brackets
- Matching union brackets
- Running outlets
- External / internal stop ends
- 68mm round downpipe and matching fittings
- Downpipe clips and fixings
- Corrosion-resistant bracket fixings suitable for the fascia substrate
Technical Specifications
Technical basis: Kalsi document TDS-RW-OG-001, issue February 2026. Check the current Ogee Rainwater System data sheet before installation. Its published hydraulic table is for the 130mm Klassic profile; obtain confirmed Krown hydraulic data from Kalsi Technical. The 68mm downpipe clearances and clip spacing follow Kalsi document TDS-RW-HR-001 for the shared round downpipe system.
Step-by-Step Installation
1 Select the System and Plan Outlets
Choose either the 130mm Klassic or 137mm Krown system and use matching gutter fittings throughout. Confirm where each 68mm downpipe can discharge to an appropriate rainwater system. Determine outlet quantity and location from the effective roof area, local design rainfall, gutter fall and outlet position. Use the published Kalsi hydraulic table for Klassic only; ask Kalsi Technical for confirmed Krown capacity data and project-specific layout support.
2 Set the Fall Line
Set the gutter to the fall selected for the hydraulic design and no flatter than 1:600. For Klassic, the published Kalsi capacity table also provides performance at 1:350 (approximately 3mm per metre); obtain the corresponding Krown design data from Kalsi Technical. Mark the fall with a string or laser line and position the gutter so the projected roof discharge enters it cleanly. Follow the roof and eaves detail rather than relying on a universal offset from the tile line.
3 Install the Running Outlet
Fix the matching running outlet at the marked position, aligning it with the fall line. The outlet also supports the gutter. Fix only into a sound fascia substrate using compatible corrosion-resistant fixings, pre-drilling timber where needed, and ensure the outlet spigot is vertical.
4 Fix Fascia Brackets
Install matching ogee fascia brackets at no more than 600mm centres. Reduce the spacing to 300mm centres in areas of heavy snow or extreme weather conditions. Provide support within 150mm of joints and fittings. Do not mix Klassic, Krown or half-round brackets. Fix into a sound substrate and keep every bracket aligned with the fall line so the decorative profile sits evenly and can move as designed.
5 Fit Gutter Lengths
Measure and cut gutter lengths square with a fine-tooth saw, then remove all swarf and burrs. Engage each length in the matching brackets in the orientation shown for the current Kalsi fittings, without forcing or distorting the decorative profile. Work progressively along the fall line.
6 Connect with Union Brackets
Join lengths with the union bracket made for the selected Klassic or Krown profile. Check that the seals are present, clean and correctly seated. Set the gutter ends to the fitting marks so the union retains the specified 10mm expansion allowance, then engage the gutter without twisting the seals. Fix the union bracket securely to the fascia and check that it follows the fall line.
7 Allow for Thermal Movement
Thermal movement is accommodated at the sealed union brackets. Maintain the 10mm allowance at each union, keep gutter lengths free to slide in their supports and do not over-tighten clips. Do not glue sealed rainwater joints or add an unlisted expansion fitting. For an unusual or uninterrupted long run, obtain a project-specific joint layout from Kalsi Technical.
8 Fit Stop Ends and Downpipe
Fit the matching internal or external stop end and check that its seal is clean and engaged. Connect 68mm round downpipe using Kalsi fittings, maintaining at least 25mm wall clearance. Fit clips at 1500mm centres where practicable and never more than 1800mm, with support within 150mm of bends and joints. Connect the base to the designed rainwater drainage point.
9 Test and Inspect
Run a hosepipe from the high end of the gutter and inspect every joint, bracket, and connection for leaks. Check the fall by observing water flow — it should move steadily towards the outlet with no pooling. View the gutter from ground level to verify the visual alignment of the ogee profile — any misaligned brackets will be obvious on this decorative profile.
Common Mistakes to Avoid
- Using half-round brackets for ogee gutter — The profiles are different. Ogee gutter requires ogee-specific brackets for correct support and alignment.
- Restricting movement at unions — Maintain the 10mm allowance at every union and keep the gutter free to slide. Do not glue sealed joints. See our hot weather expansion guidance.
- Poor bracket alignment — Ogee's flat decorative face makes misaligned brackets far more obvious than with half-round. Take time to get the string line right.
- Incorrect fall — Do not install flatter than 1:600; use the fall assumed in the system's hydraulic design.
- Mixing systems — Klassic and Krown have different profiles and fittings. Use the matching Kalsi components for the selected system.
- Skipping the water test — Always test before leaving site. A small leak at installation becomes a big callback later.
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Need Technical Help?
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