Building the last piece up to the supporting beam?

[kristofer12345]

Hi!

I have currently supported a load-bearing beam and am going to build a new interior wall out of lecablock. But I'm wondering how I should place the last blocks under the beam so that the wall itself supports the beam? Should I cut the blocks so that I can push them in under the beam for the last bit, or should I use spray foam or concrete or something else to ensure it presses against the beam in the best way? Please help me Thanks

 

[Matti_75]

Shape around and cast the last piece with expanding fine concrete.

 

[kristofer12345]

Shape around and cast the last piece with expanding fine concrete.

I have never used this, but how much does this expand in cm? How large a gap do I need between the beam and the last block?

 

[kristofer12345]

It says 4% but that's not much if we say I'm adding 10 cm? Concrete..

 

[Matti_75]

It only expands to the extent that it corresponds to the shrinkage that normally occurs in concrete. That's the advantage of expansive mortar, precisely that it fills in, in your case, under the beam.

 

[kristofer12345]

What about regular foam sealant, it is much easier to work with plus it is also used to lift cement tiles in some cases?!‍♂️

 

[kristofer12345]

"Lyfta"

 

[Matti_75]

No, absolutely not!! It has no compressive strength at all.

 

[C.Lundin]

What are you going to do? You write that you have already reinforced the beam but at the same time that the wall you are building is intended to be load-bearing. Does the wall really need to be load-bearing?

Regardless, I cannot emphasize enough not to use foam sealant; it is really not the right product whether the wall becomes load-bearing or not.

 

[kristofer12345]

Yes, the beam is already supported on the sides, but okay, not foam then, but I'm a bit unsure about the expanding concrete, I've never used it, should I mix it loose or firm and how much does it expand? If I leave 5 cm between the last block and the beam or should I leave 10, then I have to build a form and then spray in the concrete if I have to mix it loose...? If I mix it firmer, do I not need a huge form? Many questions.

 

[Matti_75]

You should mix it according to the instructions on the bag, it will then be as fluid as self-leveling compound, which allows it to flow in and fill the cavity under the beam.

 

[kristofer12345]

You should mix it according to the instructions on the bag, it will then be as fluid as pourable concrete, allowing it to flow in and fill the cavity under the beam

Ok if you've done this yourself, I assume you've worked with exp. Concrete..how much would you let be cm between the beam and the last block row? If I may ask, because you should know it works .?

 

[Matti_75]

Expanderbruk fin covers 10-100mm, so you should stay within that range.

 

[kristofer12345]

Okay good, will test.

 

[prototypen]

You cannot lift the beam a little more, cut the leca, and then lower it.

Protte