canitlever roof?

[ColJack]

ok,so for fun I'm designing a dream flat.
it's a 1 bed flat over a double garage.
it has external stairs up to the front door.
I'd like to extend the roof over these stairs as they follow the pitch.
the problem is that means tryig to figure out how to frame / support one side of the roof ( from gutter to peak ) that protrudes 1.5m..

Untitled

• ColJack
• 6 Jun 2010
• 4

asyou can see there's 4.5m roughly between the handrail and the roof so a post is kind of out..

 

[freddiemercurystwin]

I think you're losing it Col!

In answer to your question an SE designed cantilevered ladder frame would work and would give you a fairly thin roof as you've 'drawn'. Probably need some steels though. Anything's possible if you have the cash!

Don't know why you'd think a post is out, apart from an aesthetics point of view but I think that's probably best left out of this thread!

 

[ColJack]

is my roof not thick enough then?
I only stuck it on quick for the picture..
what kind of thickness will I be looking at?

it's currently drawn about 200 deep with 50mm for tile thickness on top..
I make that about 7 inch rafters and 2x1 battens on top, then 2 inch for tiles / slate..?

it's 8m from front to back of the house, and I guessed at 3m for the peak height above the wall, so that's a 4 in 3 pitch ( or is it 3 in 4, i never know if it's rise or run first.. )

 

[freddiemercurystwin]

is my roof not thick enough then?
I only stuck it on quick for the picture..
what kind of thickness will I be looking at?

No I was saying that your roof thickness was ok(ish).

BTW, technically your stairs would fail Building Regs scrutiny in several ways.

 

[ColJack]

why?

you can't just say that and leave me hanging

Untitled

• ColJack
• 6 Jun 2010
• 5

the rise / run is about 175mm rise and 250mm treads.. about 32°

 

[freddiemercurystwin]

Part M regs for dwelling access stairs:
Max Rise: 150mm
Min Going: 280mm
Maximum rise between landings: 1.8m
Minimum landing length: 900mm

 

[ColJack]

so if I put a door on the bottom then they're ok since the primary entrance would be at ground floor?

 

[freddiemercurystwin]

so if I put a door on the bottom then they're ok since the primary entrance would be at ground floor?

Correct.

 

[Static]

Stick a post in the corner..