Member
· Västra götaland
· 335 posts
Please help me!
How should one go about connecting an extension with edge elements to a slab on ground from the 1980s. Should one:
place edge elements around the extension?
Drill in rebar into the old and cast against it?
Or use some type of expansion joint between?? I think I've read somewhere about a DIL joint (dilatation joint).
Anyone who can come up with ideas and pros/cons of the different options.
How should one go about connecting an extension with edge elements to a slab on ground from the 1980s. Should one:
place edge elements around the extension?
Drill in rebar into the old and cast against it?
Or use some type of expansion joint between?? I think I've read somewhere about a DIL joint (dilatation joint).
Anyone who can come up with ideas and pros/cons of the different options.
Member
· Västra götaland
· 335 posts
No one with experience of this?
I received help from a guy at Beijer Bygg on how I should do it.
I have then made a small... small... addition with L kantelement around but not against the old slab. The old slab becomes a support to cast against but one should always reinforce downwards by making a concrete ledge. It's easy when laying out the new cell plastic; just let the later layer(s) not go all the way to the foundation and then lay down reinforcement according to instructions. This way, you will get a reinforced ledge when you cast.
I was advised to just lay thin cell plastic as an expansion joint against the old foundation and then lay the plastic film up against the old foundation. I was considering drilling and inserting reinforcement, but apparently, there was a risk of subjecting the old foundation to stresses that could cause settlement/damage... So I didn't dare... maybe it's possible?
I followed the description in http://www.thermisol.se/pdf/Broschyr_sockelelement.pdf. So talk to a better building supplier and ask what they say... so you don't decapitate me later. :wow:
I have then made a small... small... addition with L kantelement around but not against the old slab. The old slab becomes a support to cast against but one should always reinforce downwards by making a concrete ledge. It's easy when laying out the new cell plastic; just let the later layer(s) not go all the way to the foundation and then lay down reinforcement according to instructions. This way, you will get a reinforced ledge when you cast.
I was advised to just lay thin cell plastic as an expansion joint against the old foundation and then lay the plastic film up against the old foundation. I was considering drilling and inserting reinforcement, but apparently, there was a risk of subjecting the old foundation to stresses that could cause settlement/damage... So I didn't dare... maybe it's possible?
I followed the description in http://www.thermisol.se/pdf/Broschyr_sockelelement.pdf. So talk to a better building supplier and ask what they say... so you don't decapitate me later. :wow:
Member
· Västra götaland
· 335 posts
Thank you Chrille. That was kind of what I was thinking should be done. The downside of your solution is that it results in one less layer of cellplast along the joint against the existing foundation. It really shouldn't require a ledge since nothing load-bearing is usually placed along the joint. But I'm sure it will work either way. Thanks for your opinion!
It was nothing at all!
I understand what you mean... Maybe it's enough to add a few extra reinforcement bars along the old foundation to strengthen it a bit more?
I was thinking that a layer less towards the old slab doesn't make much difference since the frost or cold doesn't press against it like it does on the outer walls, so you don't lose much.
I understand what you mean... Maybe it's enough to add a few extra reinforcement bars along the old foundation to strengthen it a bit more?
I was thinking that a layer less towards the old slab doesn't make much difference since the frost or cold doesn't press against it like it does on the outer walls, so you don't lose much.
Member
· Västra götaland
· 335 posts
Yes Chrille, as you say, it might be enough to reinforce a bit more, but your idea of a higher sole is not crazy either. After all, they are 2 completely different foundations with different construction techniques meeting each other (In our case, one made in 1980 and one in 2010, nowadays the concrete is insulated, which wasn't done before).
