1 floor done

Adam2

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It's been a wile since the last blog entry and I didn't expect to have gone through yet another contractor by this stage but that's the way life goes!

 

We had some good progress with the basement floor walls going up and getting poured without a hitch. We moved on to the basement roof which is a terrace for the lower ground floor so was propped with acros (decided to buy 50 as can re-sell later). That also went well - aside from some issues identified by the structural engineer. Due to a delay in the concrete pour (don't ask), managed to get a local firm in to make up the shuttering for the exterior stairway so poured them at the same time as the basement roof - not really saving money just getting it done a bit earlier.

 

With that done we could get no with some  backfilling on the sides of the building, brining up the drainage pipes from the soakaway and building some planters between the side the basement and the boundary - reusing some of the sleepers from the retaining structure we built along the boundary. Also meant we could get some blocks in to the other boundary wall and close in our neighbour - she's been great and very understanding!

 

After applying the waterproofing and a few weeks we were able to properly backfill behind the basement. The engineer required more granular fill than the beautiful sand we had removed so that hurt a bit but never mind we cracked on with that and backfilled against the eps sheets we laid against the double drain which was against the waterproof membrane. This took a lot of time compacting in 150mm layers but we had a big excavator on site to help and a few bodies.

 

With the backfill done we could start on the ground works for the lower ground floor. Unfortunately a ground worker though a boundary wall should come down (I wasn't on site) so that made a lot more work - was the remaining part (about 8m) of a 20m long wall so more to get rid of and more to rebuild (he didn't last a lot longer). As this floor is below street sewer level we installed a1.5m x1m pump station for foul water/sewage - the upper floors go direct to the sewer so we can last a while if this get blocked up - though it does have 2 pumps, an alarm etc. Issue really was that it had to be pretty deep due to the distance from the furthest bathroom - though the groundworks guys did a great job with that. We found that a large tree we had felled (with permission) had it's stump in the way so a day was spent getting rid of that -managed to find a neighbour to take it + some off-cuts of timber!

 

You can see in the pics some decent size I beams we installed to make a king post wall retaining our neighbour's new fancy house - the beams were 9m long so 6m in the ground and 3 out to retain the excavations. Luckily I could call upon the firm I used for the  earlier retaining king post wall who happened to have hired in a great new machine which they used for 2 days to make the holes and we then used the 13T excavator to drop the steels in place - this was completely heart in your mouth stuff. The steels were too long to be lifted so the guys cut a wedge in them 1m down from the top to wrap the lifting chain around to get more height - worked great. A bit of concrete later and we had 4 solid steels which we could install the sleepers in to.

 

Rest of the ground works just took its time, we're 3.5m below ground level so all materials had to be sent down a home made chute but more problematic was the removal of 160T of additional excavations from the trenches and final levelling. how do you get that up 3.5m? We hired a long reach HiAb with a clam shell bucket and paid extra for a tipper to be loaded at the rate of 1 per hour. Took it's time but we got there eventually. We still had some final trenches and drainage right at the front of the site which of course resulted in 30T more excavations which we put in dumpy bags and got the HiAb back to lift out and put in a tipper - though kept 10 on site as a safety barrier and to reuse for backfill later.

 

And the long boundary wall - well we re-built that much stronger than it was and also a little higher to fit with a future stairway - not looking forward to the rendering cost for that !

 

So we're now ready for the concrete blinding layer and then we get the steel fixers in for 10T of rebar for the next slab. I hope it gets easier after that! and hope we keep the current team for the duration....

 

 

 

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Looks like it's coming on!

Do you have a detail drawing on your basement ceiling that is going to be a terrace - we have the same designed and interested to know how you have insulated it ?

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Here's a prelim detail - there's a small number of changes due. Debating at the moment the sliding door support - block + extra external insulation, marmox + HDPE. The slab to the left is the base of the lower ground floor built off the compacted back-fill with a 50mm concrete blinding layer on top.

Insulation on terrace is tapered, provided by waterproofing co (Alwitra), there is also 25mm on underside of the terrace not shown in that detail

 

 

 

image.thumb.png.549d49f5f80a6a47299aec4d4a70b9c3.png

 

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Looking good Adam. As I will be building a part basement lower ground floor, likely using Nudura, I would love to learn more about the waterproofing system/s that you used.

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3 minutes ago, BotusBuild said:

Looking good Adam. As I will be building a part basement lower ground floor, likely using Nudura, I would love to learn more about the waterproofing system/s that you used.

 

Thanks, this is from BASF - they have a wide range of products for use with EPS inc concrete admix

https://www.master-builders-solutions.com/en-gb/contact/persons/27 if you need a contact

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5 minutes ago, BotusBuild said:

Looking good Adam. As I will be building a part basement lower ground floor, likely using Nudura, I would love to learn more about the waterproofing system/s that you used.

 

I am going through the process of waterproofing solutions / contractors for my 3 sided basement.

 

it looks like a Type A barrier self adhesive membrane (with a surface premier) and geo drain earth side of it, i would interested to know the manufacturer.

 

@Adam2 have you used waterproof concrete or going for a Type C barrier internally? Also that looks like EPS insulation on the outside of the geodrain?

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@Moonshine yes waterproof concrete (BASF - link above). No surface primer needed - well only on the toe of the slab where applying direct to concrete. Also used the underslab concrete membrane. All OTT really as we're on sand and the ground drains well - the old house here had none of this and no leaks.

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On 19/02/2021 at 12:24, Adam2 said:

 

Thanks, this is from BASF - they have a wide range of products for use with EPS inc concrete admix

https://www.master-builders-solutions.com/en-gb/contact/persons/27 if you need a contact

What is item 13 on your terrace? - trying to work out where your insulation is to avoid condensation on the basement ceiling (which a friend of mine is currently suffering with)

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4 minutes ago, Trw144 said:

What is item 13 on your terrace?

Yes this is the PIR something like 180mm dropping to 100mm. Also 25mm on underside I think not shown in that detail

 

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1 minute ago, Adam2 said:

Yes this is the PIR something like 180mm dropping to 100mm. Also 25mm on underside I think not shown in that detail

 

Sorry, next question! What's the covering on the PIR?

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1 hour ago, Trw144 said:

Sorry, next question! What's the covering on the PIR?

Will be EDPM with a pedestal for tiles on top of that - will check on vapour layer -roofing co are speccing that -I trust them

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