ᐅ Eaves and bargeboard of a gable roof

Hello,

I am curious why manufacturers specify sizes for their gable roofs like 50 / 30 or 70 / 50 (eaves side / verge). Why is the measurement larger on the eaves side than on the verge side? Is there a particular reason for this?

Gregor_K schrieb:

I’m curious why manufacturers specify dimensions like 50 / 30 or 70 / 50 (eaves side / gable edge) for their pitched roofs.

Probably because comparative builders want that information in the building specification.

Gregor_K schrieb:

Is there a reason for that?

No, it’s more likely a misunderstanding to draw conclusions from that.

Gregor_K schrieb:

So why is the eaves projection bigger than at the gable edge?

An overhanging rafter length of 70 cm (28 inches) is projected into the base area, just like 50 cm (20 inches) on the gable edge – at least for a 45° roof pitch.

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A short verge overhang can be easily achieved without much effort (roof battens are often structurally sufficient). The slightly larger ones at the eaves can also be done simply by extending the rafters.

… but ultimately it is about the different appearance in the variations.
However, be careful: equal to or greater than 50cm (20 inches) will be considered part of the building structure.

11ant schrieb:

A 70cm (28 inches) overhanging rafter length is projected onto the building footprint, as is 50cm (20 inches), including 50cm (20 inches) at the gable/verge – at least for a 45° roof pitch.

That's exactly what I wanted to know. Now it's clear why a hip roof has the same eaves overhang on all sides, while a gable roof does not.