How to build this “gable”

[liftfan]

Hi,

I’m struggling with this detail circled:

I’ve built this far:

I’m going to bolt new rafters to old to end up with a 20 degree slope:

But, what do I do at this end:

Do I extend the wall plate across the cavity:

Like this:

Help please!

 

[^woody^]

If the/a wall does not extend back into the house, then you need to contruct a timber wall off a double rafter and clad it - but it looks like lead flashing will disguise it.

Any masonry will need a DPC where is goes over the existing roof, unless you can be sure that it wont ever get wet.

 

[liftfan]

Ok thanks Woody.

If I continue the block work back to the existing wall then, on a dpc am I ok to just extend that wall plate out so a rafter can sit on it:

 

[^woody^]

Yes it would be OK. Normally you would cut the plate on the internal leaf and form what is called a gable ladder, but doing it like that would not be an issue. Just make sure that the end of the plate is well protected from getting wet as its very susceptible to rot if left exposed and even if painted.

Also make sure you understand the concept of the DPC on exposed walls above a roof. It would need to be stepped and be placed above the flashing line. The idea is to prevent damp moving down the wall and into the room or structure below. It all depends on how much exposed wall you will have.

 

[liftfan]

Ah...now I get you!

Great, thanks!

 

[noseall]

Looks like you have used an eaves type lintel when you should have used a regular lintel, as you will be building masonry over.

 

[liftfan]

Well spotted ...yes it’s an eaves lintel.

Was intending to do soffit/eaves as show in blue below dropping timber down to support as it’s a shallow angle. Will that work?

 

[noseall]

Will that work?

As long as you don't mind looking an 11" deep fascia then fine.

 

[liftfan]

Bit late now.

The height from the top of the rafter to the lintel flange is 200mm. That doesn’t seem too bad does it?

If I want the fascias to match the rest of the house then I’m thinking I could but a 4x2 timber horizontally across on the lintel and then just clad that same as a fascia. Then the soffit rests on that?

Or 1/2 height aircrete block across the length?

 

[noseall]

Bit late now.


View attachment 173063



The height from the top of the rafter to the lintel flange is 200mm.

You need about 50mm for the tile kick plus say 10mm for the plastic capping.
Not then end of the world no.