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How to fit a gutter to a curved roof ?

Lindab have designed a unique radius gutter bracket to simplify gutter installation to curved rooflines.

A sweeping bow front or convex recess might make an attractive feature of a building however bespoke radius guttering can be very expensive and fitting straight guttering can be very difficult.

Radius Gutter Bracket

Lindab’s expert product development team have created a fascia bracket that also functions as a gutter joint with a rubber seal and a tolerance for a 4° alignment deviation at each joint.

Using the radius gutter bracket, sections of standard gutters can easily be fitted in a faceted arrangement which will service a curved façade without the need for expensive bespoke gutters.

It is easy to calculate the optimum number of brackets and length of gutter section required for this fitting method.

Step by step guide:

Step 1 – Calculate the radius of the curve
Measure the width and depth of the curve; laying straight beams or gutters against the curve in the arrangement shown will help if plan drawings aren’t available.

Apply the following formula to these measurements to calculate the radius of the arc:
Radius = (d / 2) + ((w2)/(8 x d))


Step 2Calculate the angle of the curve
Mark each end of the curve and measure the length of the arc.

Apply the following formula to calculate the angle of the arc:
Angle = ( l / r) x (180 / π)


Step 3Calculate the number of brackets
Apply the following formula to calculate the minimum number of RSKR brackets required:
No. of RSKRs = (angle / 4) + 2
The result should be rounded up to the nearest integer.


Step 4Calculate the gutter lengths
The required length of the gutter segments can be approximately calculated using the following formula:
Gutter length = l / (No. of RSKRs – 1)

Calculations are based on the assumption that the curve has a fixed radius and are for guidance only.

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