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So looking at photos on internet for biodisc, I think the inlet is at the correct height relative to the machinery. It's just set down a lot lower than maybe it ordinarily would be and I guess essentially has another riser (or neck if that's what you meant @ProDave? on top to get to ground height. I think the reason it's set so low is that the primary drainage comes from back of house and all the way around side. So it's probably a good 30 metre run in total before it gets to STP. Apologies I thought I'd sent a photo of inside orignally. See attached now. Arrow shows the inlet.

Thanks all for replies. I only recently moved in, but I did have drain surveys done and everything seems intact. See attached a few photos where you can see the vertical drop and then where it enters STP. I haven't determined exact levels yet, so the branch may be able to go higher. Is it worth considering making the run more like 1 in 50 to get the branch higher? Thanks

Hi there, I'm in process of running a new drain at front of house for a new upstairs bathroom. I've dug out where it needs to connect to and got a rough idea of what I hope to do now. I've got the building inspector coming at end of week but wanted to check views here first. As you can see from attachments the connection is very close to the Sewage Treatment plant (STP). The inlet to this is around 1.3m deep where the main line from back of house runs. There is also a separate drain connection that runs alongside this and drops vertically which comes from garage. Unfortunatley it seems like they have bedded it partly in loose concrete and it's proving hard to easily excavate under the pipe to get an inspection chamber base in. So in the sketch I've shown in the dark colour pipe my proposal instead with an extra rodding point as well (if necessary). The new connection is a straight run about 15 metres and will have an inspection chamber and the main existing drain. also has an inspection chamber about 12 metres away. And the drain from garage also has an inspection chamber about a metre away next to STP. Also, yes I'm pretty sure the water is ground water and not a massive leak from the STP. I recently moved in to house and had all the drains surveyed and they all seem fine. So, does my proposal seem ok? Thanks

Hi there, I'm just finishing designing a new roof which is going on an extension and wanted to check to see if anyone had any better ideas for how to weatherproof where I have adjoining cedar shingles and glazing. I've attached a few photos which hopefully are clear. The red is the underlay and the dark grey is either going to be lead (or lead alternative) flashing or I may get it made up in aluminium. I think the way I've detailed works, but open to alternative ideas! I've also attached photo showing the glazing bar end cap. Part of the reason for the way I've design is also to make sure I can somewhat easily replace the glass if I need to. Thanks