SLANTED JOISTS

[grifter]

I want to construct a slanted ceiling, but apart from the birds mouth joint onto the higher wall plate, what is the best way to attach to the lower plate? Is it another birdsmouth or just cut the angle and fix. It will be plasterboarded.
Thanks

 

[23vc]

Another birdsmouth, just like the top. Then continue it down to a plumb (vertical) cut where the fascia’s going to be. Sometimes it needs another little notch further down to clear the outer skin (if there is one)

Edit: although your pic seems to suggest it abuts a wall at the bottom, like a lean to between two buildings. If so, you’ll need to get the gutter right…

 

[grifter]

Another birdsmouth, just like the top. Then continue it down to a plumb (vertical) cut where the fascia’s going to be. Sometimes it needs another little notch further down to clear the outer skin (if there is one)

Edit: although your pic seems to suggest it abuts a wall at the bottom, like a lean to between two buildings. If so, you’ll need to get the gutter right…

It's going underneath an existing glass roof and is completely internal, so the lower plate is fixed to the internal wall.

 

[johnny2007]

Truss clips?

 

[^woody^]

Normally the rafter would be seated with a birdsmouth, but if you did not want to see the ledger plate, just the underside of the ceiling meeting the wall, then you would use a 2x2 and a 2" notch on the bottom of the rafters.

 

[grifter]

Normally the rafter would be seated with a birdsmouth, but if you did not want to see the ledger plate, just the underside of the ceiling meeting the wall, then you would use a 2x2 and a 2" notch on the bottom of the rafters.

Don't suppose you could do a quick drawing of what you mean if you don't mind.

 

[23vc]

I’ll let woody mark that out of 10.

 

[grifter]

View attachment 331054

I’ll let woody mark that out of 10.

Thanks. Is the 2x2 instead of the ledger plate or fixed to it to bring it out?

 

[robinbanks]

Instead of. If you don't like it, put a ledger and joist hangers so the ledger is entirely in the ceiling

ps; think I'd have drawn that 2x2 a bit closer to the bottom of the rafter. In that location it's a bit weak

 

[noseall]

View attachment 331054

I’ll let woody mark that out of 10.

I'd put the lump at the bottom. That'll be a pig to cut out.

Rather than either though, I'd rather butt it and fix galv Simpson angle framing plates up each side.

 

[noseall]

Instead of. If you don't like it, put a ledger and joist hangers so the ledger is entirely in the ceiling

ps; think I'd have drawn that 2x2 a bit closer to the bottom of the rafter. In that location it's a bit weak

Ditto!

 

[grifter]

Ditto!

Would this work but the joist going upwards instead?

 

[noseall]

Would this work but the joist going upwards instead?

Yes, as long as the thrust is taken into account.

 

[23vc]

think I'd have drawn that 2x2 a bit closer to the bottom of the rafter

It was the best I could manage with a fat finger and an iPhone screen

 

[johnny2007]

Would this work but the joist going upwards instead?

Didn't I mention truss clips?