Gutter installation question

[BuggBairn]

I have a full length flat roof dormer at the back of my property that is about 16m long. The gutter had outlets at both ends of the dormer.

I'm replacing the existing plastic guttering with deepflow plastic.

I'm after some advice on best practice to achieve a slope towards each outlet please.

 

[Ian H]

A string line to line up your brackets pulled up slightly in the centre.

 

[BuggBairn]

A symmetrical line that peaks ever so slightly in the exact center ? Achieve this by deliberately having a union dead center?

Is this in line with your suggestion?

 

[noseall]

Achieve this by deliberately having a union dead center?

I would do the opposite and avoid a union in the centre of the peak.

 

[BuggBairn]

I would do the opposite and avoid a union in the centre of the peak.

N
And just use the ability of the plastic gutter to flex that center section ?

 

[noseall]

N
And just use the ability of the plastic gutter to flex that center section ?

Correct. Hold a 5m length of gutter in the centre and it will flex naturally and more than is required to meet falls. Much better than stressing the rubbers and dog-legging in the middle via a union.