flanagaj

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.

Having been unable to find anyone who seems half interested in doing our specified power floated floors, we have decided to go with a conventional ground supported slab build up with the insulation on top of the reinforced concrete slab. I decided to go with 150mm insulation on top of the slab simply because I didn't want to have the really long warm up times I'd get if I had a 150mm slab with a 70mm screed layer on top. Can anyone explain or show a diagram which details how the screed layer, inner block leaf and PIR come together at the door reveals when you have a level threshold. Does the PIR simply protrude into the reveal and mate up against the internal face of the outer brick leaf?

So there has been a cock up. It’s been marked out with a 100mm cavity instead of a 150mm cavity. I’ve just raised this with the surveyor and he tells me that the Dwg file that I provided him showed a 100mm cavity instead of a 150mm cavity. How do people managed to xxxx up the most basic tasks.

Would you still check even though it was set out with a total station? some of the pins are not vertical, so that will skew the diagonal measurement.

I’ll be out with my tape measure later, but I’ll be very disappointed if it’s not 😂

I wasted a weekend and a £100 in timber .. the surveyor chap marked it all out in 2 hours 🙄

I can picture the reaction to that realisation

I bought a Topcon rotary last year. Invaluable piece of kit.

I'm going to bang some vertical rebar into the centre line of the trenches and level the tops with my laser level. I'll spray the tops red to aid visibility. I'm also hiring an inline pump so it can be poured quickly.

I've actually found a surveyor in Southampton who is coming out tomorrow afternoon to mark it out with a total station. Given the cost and associated implications of getting it wrong, it's a no brainer.

This week is looking nice and dry with daytime temperatures in the region of 14c-18c, but with low temperatures overnight. If the concrete is poured in the morning and I cover the trenches with a concrete frost protection blanket, will that suffice and ensure that the concrete doesn't suffer irreparable damage.

I've already had the site levelled 200mm below finished floor and 1m wider than the dwelling.

This is really helpful. I hadn't thought about multiple visits and assumed they just came once to set out and that was it, but it makes complete sense for them to mark the concrete footings for the exact location of the wall position.

So armed with profile boards, Pythagoras theory ... My wife and I attempted to set out the profile boards for our house this weekend. The net result of our efforts was zero and we've concluded that it's beyond our capabilities and just too risky to get wrong. If it was a small footprint on flat ground, then it would be fine, but we've got a 450mm height delta between the attached garage and the house. Plus, the house is 24m x 7m, which means the slightest discrepancy on any of the angles will result in a significant error. So I'm now wanting to know what specialist I need to employ who can accurately set out the building, eg, mark the position of all internal and external walls and also erect timber profile boards. If anyone can recommend anyone in Hampshire then can you message me.

😂we've got quite comfortable in our static caravan

I really need to hire a pump as otherwise, there is going to be a lot of manual raking

I have just called around to get a quote for 24m3 of C25 and have quotes from £120/m3 to £191/m3 Given that concrete is something that you don't want to get wrong, is there anything I should be aware of here as that is a massive difference.

It was quite fortuitous. I heard a knock on the door and the BCO was stood there. Turns out, that he got the wrong Thursday, but he was ever so helpful and fully understood about inspecting the rear trench and allow us to crack on.

So, on that basis it should be viable to pour in one hit

Plan was to pump the footings in one go. 24m3 of concrete. Is this not possible?

I have started to realise that using the TA recommended by my brother in law was not the best decision. He has drawn the footings as below (300mm strip) My plan is to increase the depth of the footing by another 225mm. This means I would have effectively 3 courses of block below FFL. I want to avoid having to put soil pipe through the trench and ideally want to have the pipe go through the blockwork via lintels. Otherwise, I need to get some oversized pipe in place for when we pour (next Friday). The invert level of the lowest IC is 550mm below FFL, so I cannot go too shallow, otherwise, I will have to put the soil pipe through the trench footing.

Can I ask why you had the vertical rebar in the foundations?

I eventually found a chap with a nice 2022 3CX JCB. He graded the whole site today and has told me he'll pull the footings in 2 days next week. Can you tell me a bit more about the other points. Especially, around the concrete line pump. I have calculated that I need 25m3 of C25 concrete and the furthest point from the truck will be 16m, so I assume a pump is the way to go. Will building control be happy to inspect the footings before they are all fully completed as it will be difficult to go back over the rear footing once it has been pulled and the other footings are done.

Yes, but they are not very clear.