Lean to roof minimum pitch...

[Daz83]

I've just had a lean to roof built on my rear extension (not yet tiled) and the builder has built it at a pitch of 15.5 degrees... I told him I wanted marley modern tiles that have a minimum pitch recommendation of 17.5 degrees. Is this just a guideline or is it imperative that the pitch is no less than 17.5 because he' was telling me it will be ok. Problem is he's done a runner with the money I paid him so I've been left with a potential problem that I'm going to have to rectify myself. So before I rip the roof down I was hoping for some advice if anyone had any. Thanks.

 

[palaceray]

The Moderns should not be fitted below 17.5.
You can either fit something like a Sandtoft 20 20 or maybe you could increase the pitch by fixing firring pieces on top of the rafters.

 

[Daz83]

Thanks, Is furring common practice in situations like this? and would BCO be ok with it?

 

[garyo]

Is it at 15.5 for a reason - do you have the space under any upstairs windows to take the thickness of the battens, tiles, and some lead flashing?

 

[noseall]

Thanks, Is furring common practice in situations like this? and would BCO be ok with it?

It certainly is when a truss roof company makes a cock-up of the roof pitch, yes.

BC will be fine.

P.S. you could go with a Marley 'Wessex'

 

[Daz83]

Thanks for all your advise... I've decided to go with the Wessex, a little different to mods, and a little more expensive, but will solve the problem. pitch was probably low due to closeness to underside of window like someone mentioned. thanks again. Daz.

 

[noseall]

. pitch was probably low due to closeness to underside of window like someone mentioned. thanks again. Daz.

Yeah, always a bummer when the builder defies the customer and sets a roof pitch so that you don't end up with the roof tiles hitting your bedroom glass.
Top tip: Roof pitch dictates tile choice first and not customer.