Eaves overhang

[mwkenna]

Gents

What's the perfect overhang rafter overhang at the eaves for a metal sheet roof? I am thinking somewhere in the region of 25-30cm?

What do you think?

Thanks,
Mark.

 

[freddiemercurystwin]

It depends.

 

[mwkenna]

What does it depend on? I thought it would be a standard size?

Thanks,
Mark.

 

[freddiemercurystwin]

It could depend on the pitch, a need to match an existing eaves or not, the detail and how it’s supported, personal preference, the soffit, vents required or not, all sorts …. The ideal overhang will vary to suit each situation.

 

[mwkenna]

Well basically I have not even finished blocking to the required height yet so all options are open. I am going to be using 2x4 for the trusses, the span from wall to wall will be 4m, there will be no vents needed as far as I can see. Single block construction.

What's a good ballpark figure?

Thanks,
Mark.

 

[freddiemercurystwin]

25-30cm.

 

[theprinceofdarkness]

If this is going to be a version of the 1970s flat roofed garage, slope from front to back , very shallow pitch, say 1 in 20. Then what happens at the back is that water drips backwards from the edge towards the building. Don't ask, because superficially its running up hill by 1/4" or so, could be with the wind, or dust sticking to the underside of the overhang. So with this form of construction some drip rail is imperative to stop this effect or an overhang of 2' !! I suspect a bead of silicone a few inches in front of the wall would be enough.
Frank

 

[mwkenna]

The pitch I was thinking will be either 12/6 or 12/7. Not decided yet. I don't want a really shallow pitch as I'd like to have a little storage in the roof space. I think the plan is to have an overhang of 25cm and then fit some nice wooden shiplap soffits - give it a log cabin feel

I will also follow the same 25cm overhang at the gable ends with a small-ish ladder.

What do you think?

Thanks,
Mark.