Dormer cheeks and fronts - OSB 3 or plywood ?

[akist]

I have a choice, not sure what to choose. The carpenters are happy to use either and perhaps are happier with the OSB as cheap(er) and cheerful.

The covering would be lead, but if too expensive then just tiles.

 

[datarebal]

lead = ply

 

[akist]

What lead should I use? I presume Code 4, but the roofer has said Code 3 would be adequate, and a merchant said I need Code 5. What should I consider?

 

[^woody^]

Consider sacking the roofer for a start.

Then buy from the merchant.

 

[datarebal]

What lead should I use?

Definitely not code 3. It depends on size and design of area to be clad. 5 is generally safe and the cost between 4 and 5 isn't massive

 

[noseall]

What lead should I use? I presume Code 4

We used code 4 on this dormer but the area is very small...

Crank1

• noseall
• 28 Nov 2021

 

[akist]

Got a "good" price for Code 5 so I think I will use that! Fingers crossed.

 

[akist]

lead = ply

Hello, as my carpenter prefers OSB, and I cannot find anything online, could you please explain it to me?

 

[Notch7]

are happier with the OSB as cheap(er) and cheerful.

I wouldnt call OSB cheap these days

 

[datarebal]

Because ply is the correct product.
It's not about what a chippy prefers.

 

[akist]

OK thank you. His assistant mentioned that they do not intend to screw anything down, OSB or plywood, they use their nail guns instead. Is there a reason the dormer cheeks/fronts must be screwed? And if nails is all I am getting, is plywood or OSB better for it?