flanagaj

If an internal soil pipe comes down the wall and exits the house via a rest bend, is the invert level of said waste pipe governed by the thickness of the floor build up, eg screed, 150mm PIR, 150mm concrete slab, sand blinding, hardcore? Or are those layers irrelevant by the virtue of exiting straight out the house? I am also scratching my head as to how I use a rest bend and Radon barrier to hat on said rest bend when the bend radius is quite large and the Radon membrane is underneath the concrete slab. This will mean that for the barrier hat to be sitting on the vertical pipe, the invert level is forced really deep. I had no intention of having to run a deep invert just because of a Radon membrane.

I do have a piece of ground that I can just dump the slops on. Someone suggested knocking up a plywood 1m2 sized container that they can use.

The brickie and his labourer are now coming along to assist.

What's the pea shingle for?

I'm already feeling very apprehensive. Being a catastrophiser, doesn't help matters.

So, I'm doing it with just the wife and I. We are having a pump though, so hoping that will negate any problems.

I was planning on pouring this all in one shot using a pump. The only part of the step footings I’m scratching my head about, is the distance that I need to allow after the internal cavity wall which is at a lower depth. I have drawn the step footing below, but don’t know where the step goes in relation to the lower 600mm footing.

I just need to make sure that the stress of the first one doesn't kill me first!

Thanks. I am going to knock one of those up tomorrow.

I've got a topcon. It was more for a visual cue when the concrete is being pumped into the trench.

The detail of the step footing. I understand that regs require you to have 2 * the height overlap in the horizontal plane. What I am trying to work out is how you do the step. Would you just step up 450mm in one place and if so, how does the bricklayer tie the block courses into the vertical face of the stepped concrete?

The sectional drawing that the TA did for the split height between the garage and the house is below. So it shows a stepped footing, but the crucial detail is missing. I have learnt a valuable lesson regarding "If you pay peanuts ..." As a result, I am going to play it safe and simply pull the footings through level and just suck up the additional muck away cost, blocks and labour .. I am surprised BCO didn't say "I want to see detail as to the proposed horizontal overlap and where the step up will be placed relative to the internal cavity wall"

I will hammer the rebar into the sides or simply spray lines on the side of the trench.

I went out yesterday evening to sanity check the pin spacing measurements and they were around 50mm greater than my cavity centre calculations. So I then contacted the surveyor who confirmed that his drawings showed a 100mm cavity. Architect then apologised for sending over an old drawing which showed 100mm cavity. This was from when we were going to have a 100mm cavity and use 90mm PIR. so I’ve now taken the afternoon off work to validate and move the pins.

Ok, thanks. I didn't consider using two layers of 75mm instead of a single 150mm layer. I can see that by staggering the joints, you negate any potential cold spots where the insulation butts up together.