Casting slab with 5cm S80 foam insulation at the bottom?

[cem77]

There is really no reason to have insulation under the footing for a crawl space foundation. It's a different matter with a perimeter beam on a fully cast slab.

Then the casting itself becomes too thin if that form is to be used. You need to have about a 20 cm concrete.

Do it again, do it right.

Any insulation should then be on the outside to protect against frost.

 

[Plupp 170879]

It may not make any difference to the answers you've received, but are you casting on bedrock?

 

[Mr_Bear]

Maybe the Cellplast and ångplast are there because they were intended to become a warm foundation? However, if so, the plastic is in the wrong place. But they may have their reasons.

The sole's thickness doesn't feel well thought out.

 

[biasb]

Late response here.

But after I pointed out the problem with using the cell plastic at the bottom, the company removed the cell plastic and the plastic, and added another 45cm to make the foundation 24cm (195 + 45) high and reinforced it in two layers.

So now it's cast and bricked, I've created a new thread for it:
https://www.byggahus.se/forum/threads/efterfoga-leca-murning.342628/

 

[Heij83]

Is it the same company that cast the foundation?
I think it's doubtful if they have any competence in this area at all.
I'm not a mason but would have made sure there was mortar between the stones, and as previously noted, they were completely out of their depth regarding the foundation.

 

[biasb]

Don't know if you replied in the other thread here. Maybe it got a little messy, didn't know if I should continue here or with a new question (even though they're related).

Yes, it's the same firm that cast the foundation, after they changed the foundation I thought it would be resolved (perhaps a bit naive? ) as soon as it was in place.

The trust in the firm right now isn't particularly high.

 

[Heij83]

Don't know if you replied to the other thread here. It might have become a bit confusing, wasn't sure if I should continue here or with a new question (even if it's related).

Yes, it's the same company that poured the foundation, after they changed the foundation, I thought it would be resolved (maybe a bit naive? ) as soon as it was in place.

The trust in the company right now is not particularly high.

I commented on the foam plastic that S100 should not be sufficient.
Are there no drawings of the foundation or the house that the contractor should adhere to?

 

[biasb]

No. It was a simple extension with a crawl space that we did not need a building permit for (outside densely populated areas), so we entrusted the actual foundation construction to the building company. We have drawn plans for a building permit (before we knew we didn't need one), but they are not construction drawings.

 

[Heij83]

No. It was a simple extension with a crawl space that we didn't need a building permit for (outside densely populated area) so we left the foundation construction to the construction company. We have drawn drawings for a building permit (before we knew we didn't need one), but they are not construction drawings.

Well, then maybe it's enough, but it feels a bit uncertain as we pointed out that they remove the cell foam and also make the sole thicker. If one is sure of their case, wouldn't they argue for it?

 

[Rabbithole]

Has the municipality confirmed that you do not need a building permit? Keep track of that so you don't encounter an unauthorized construction investigation.