flanagaj

Brett Martin drainage seems quite readily available online and I was wondering what thoughts people have on the quality. I have read that Wavin and Floplast are also very good, but I'm struggling to find online sellers who also sell perforated pipe. In a separate topic, I've seen very large price variations on 110mm underground drainage.

In case anybody reads this thread in the future as they too want a raised outlet, here is the drawing that I finally received from one of the Graf reps. A picture speaks a thousand words. One2clean with Raised Outlet_ Specification.pdf

Mortgage offer received from Hanley Economic 1st August - 5.85%.

The problem is now resolved. Graf are pretty useless when it comes to their online documentation and the various configurations of their tanks. It was only when I came across a web site selling them, did I realise that there are actually 4 outlet configurations. Every other site just lists the tanks as 'Gravity' or 'Pumped' outlets. So you can raise the outlet by either 300mm or 515mm with the standard lift system that comes with the tank. I was just about to hit buy on a pumped tank. Having a raised outlet helps as it means it puts my drainage field above the fast draining chalk layer and into the soil layer that gives me a > 12 Vp reading. This not only saves a huge amount of excavation, but also having to put a 700mm sand layer underneath the drainage field to increase the Vp so that it meets the criteria.

You can get a level invert chamber. The below would work.

450k

Seems strange that they want an IC. The tanks all have internal sampling chambers so unsure why they want one. Did they give a reason?

I am trying to deduce the junction below and how best to do it with 110mm soil pipe. I want the flow to go in both directions, but didn't want to use an inspection chamber. It's the pipe layout for a drainage field.

I didn't twig at the time, but the valuation performed by the mortgage company valued our plot at 250k (bit of a shock, given I paid 350k) and they valued the house at 950k. It's a 200m2 property. I didn't think too much of it and went and purchased the site insurance / self build warranty on the basis of the figure from estimators online. Namely 350k. I then get an email today from the conveyancing solicitor telling me that Hanley want the site insurance and structural warranty increasing from 350k to 700k. No problem, I said, it will only be a few quid. Cut a long story short, it's another £2800 Moral of the story, make sure you push back against any overinflated valuation of the rebuild cost. 700k to rebuild a 200m2 with an attached garage is a complete joke, but I am not sure if there is anything I can do about it.

Thanks @Gus Potter for taking the time to respond with such a detailed insight regarding the bending characteristics of masonry walls and whether they provide the required structural characteristics for a cantilevered staircase. Given a steel structure appears to be the best option, I'm keen to understand more.

I need to order some stuff, so I can finally get started on site. First job is to get a hardstanding down and the second is to install the STP and drainage field. Can anyone tell me what type of fabric I need for the two jobs as I am not sure?

That to me is disgraceful and I am surprised it's lawful. If it's a self-build, then it's exempt. Incorrectly completing a form, should not make CIL exemption null & void.

I agree, but if the sub floor structure is as follows, then the soil pipe needs to be buried below the layers in the diagram below? This will then dictate that the invert of the first IC 28 metres from where the tank will be located?

No. It's the unit where the invert level of the outlet is higher than the inlet. It has a pump that then pumps the treated water to another tank higher up.

You think they would look at the submitted drawings and see that there is no change to the buildings proposed footprint.