Eaves depth

[Anonymous]

Hi!

If I have an insulated roof, at say 300mm deep, when it gets beyond the external wall I need it to be shallower so that I don't have a massively deep fascia.

What is the cleanest most efficient way of doing this?

[gpowless]

For cathedral ceilings like that I model the roof & the sloped ceiling separately. This allows the rafter tails to extend beyond the walls & keeps the ceiling inside of the conditioned space.

[Anonymous]

Cool thanks.

So would you then effectively have 2 roofs one on top of the other?

[Richard Morrison]

You might also look at Eric Bobrow's approach which uses SEOs and gives you more flexibility. https://youtu.be/lmgGoPhvl_Q

[Anonymous]

Richard wrote:
You might also look at Eric Bobrow's approach which uses SEOs and gives you more flexibility. https://youtu.be/lmgGoPhvl_Q

That's awesome, thank you!

[gpowless]

zak1607 wrote:
Cool thanks.

So would you then effectively have 2 roofs one on top of the other?

Yes. The ceiling pivot is placed at the inside of the wall and the roof pivot line is placed on the outside. This also works with scissor trusses or coffered ceilings where the interior ceiling is at a different pitch than the roof pitch. The ceiling of course consists of the ceiling finish and insulation. The roof composite contains the shingles, sheathing and top chord of truss / rafter. I also have a composite that I use for the minimum ventilation / thickness at the eaves and then SEO the ceiling insulation.

[Anonymous]

Brill thanks

[Steve Jepson]

[Steve Jepson]

Model your roof just like it will be constructed.

[Anonymous]

Thanks Steve,

Though that's probably more effort than I'd want to put in for planning drawings, that's definitely what I'd do for regs/construction drawings.