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Good question Leofric, I've no idea. This is the drawing but it doesn't seem to shed any light on the question! I'll have to google the options you mention there/ask the roofer. catlad - it's so long since this was designed that I can't fully remember why we went for this design but I think...

Thanks datarebal that's really helpful. It sounds like GRP is the way to go.

If it can be done would you go for lead over fibreglass Makie?

Cheers Leofric I’ll look that up. That doesn’t sound too bad

It's just over 6 metres long. The roofer suggested doing it in fibreglass rather than lead (cost). It is working out at about 26 degrees on site. My understanding is that you can go down to 20 degrees with natural slate. I'll check those points with the chippie and brickie tomorrow. Thanks...

It is all just about to be set in stone (almost literally). The brickie is up to the height that the joist hangers go in. The chippie was supposed to come today to check we can achieve the minimum pitch on the roof, which is supposed to be slate (another issue with the drawings) and tell the...

That’s my plan, hence the question about the joist hangers because all the drawings of box gutters I can find online have the joists sat on top of the wall. It sounds like that’s ok though, so I’ll just check the rest matches the construction details I can find online. Unfortunately I did pay...

Hi woody Reason for the box gutter is the proximity of the neighbour’s wall. There isn’t enough room between the walls for us to have a gutter. You can just about see the neighbour’s wall on the drawing which were shown as flashing into (neighbour has agreed to this).

What do you mean Leofric? Can you see a problem? I can’t understand about the blockwork getting wider and I’ll be checking that they put boards across the joists to make the fall front to back. Cavity closer?

Yeah the drawings are rubbish. We had wanted to have a box gutter with no parapet wall but he didn't know how to draw it! This is what we ended up with, and even that doesn't seem like the usual way of doing this. The chippie has taken it to mean joist hangers. Good to hear that they're ok...

I'm having an extension built at the moment which includes a pitched roof down to a box gutter and parapet wall. I've uploaded the section from the building regs drawings which show that the design has the roof joists on hangers and then the box gutter sat on top of the inner leaf of the cavity...

Thanks for the replies. I've been away and only just saw that some more came in. To answer the questions: *Hugh Jaleak* - unfortunately that's right on the boundary so it would take it onto my neighbour's property. *cjard* - I've marked up the boundaries in blue on the drawing below and the...

That all makes sense. Thanks again for all your help with this.

Also, the Thames Water build over booklet that I got the idea for my scheme from shows this which has a bend with no chamber:

Woody - you've confused me now. The drawing by our building regs chap has 2 bends with no chambers and you said it was ok other than the fact that it doesn't deal with the kitchen connections.

That's interesting 1990. I can't decide now whether to try to get approval without the internal chamber. If you're saying it would only block at the join to clay, that's the bit that we could rod from the external manhole. I'll check we're getting the upstairs SVP access. Unfortunately I...

Thank you very much for that. I was thinking to probably give up trying to avoid an internal chamber. We've got a single bend in a brick chamber at the moment and have had just the one blockage in 11 years of living here. I can't remember what that was. Anyway, thanks again.

This is the existing drains - drawn onto the drawings for the extension, I hope that isn't too confusing. The washing machine and sink etc. are below where the shower and bathroom sink are - so all the drainage from the kitchen runs along that side. It would be a new toilet, located where the...

Unfortunately we are not on good terms with that neighbour - hence the step in rather than a new party wall. I have asked the question but didn't offer any money yet. Realistically I think pigs will be flying over the frozen gates of hell before they agree.

The bathroom is above where I've suggested the soil pipe goes, although the loo is half way between where I've drawn it and where he has drawn it so it has to be piped along a bit either way. I've asked him that question too! That's interesting about the location of the blockages. I guess...