Gutter diameter

[Triple07]

Decided on galvanised Lidab majestic guttering...anybody got this and what diameter did they go for?

choices are: 100, 125,150 and 190... ruling out 150 and 190 as enormous for a 1.5 story building! 

[PeterW]

Depends on the roof pitch and also the tile overhang. 125mm is much better than 100 - deepflow gutters also don’t need as many downpipes

[MikeSharp01]

 

14 minutes ago, PeterW said:

Depends on the roof pitch and also the tile overhang. 125mm is much better than 100 - deepflow gutters also don’t need as many downpipes

How do you work out how many down pipes I wonder.

[PeterW]

2 minutes ago, MikeSharp01 said:

 

How do you work out how many down pipes I wonder.

 

BSEN 12056, Part 3: Roof drainage, layout and calculations...

 

 

[Triple07]

Slate roof, 42degree pitch, overhang of 60mm, can’t see an option for deep flow but think the steel is all deep? Happy to be corrected!

[Tennentslager]

It's in here...

roof_drainage_system_assembly.pdf

[Mr Punter]

You need to be pretty handy with the tin snips for cutting Lindab and fitting outlets.  Saw or grinder is a no-no as the rough edges rust where a clean cut has less surface area and will heal with galv.

[MikeSharp01]

14 hours ago, PeterW said:

BSEN 12056, Part 3: Roof drainage, layout and calculations...

That is interesting, I just took the house next door as an example of required drainage arrangements and used the part H rules for the BC stuff, seems I could have been much more refined. 

[Triple07]

Thanks @Tennentslager knew there would be a pdf somewhere but I couldn’t find it!