Isolated reinforced concrete wall Legnobloc

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fabio.gel
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Isolated reinforced concrete wall Legnobloc




by fabio.gel » 13/02/11, 11:31

Hello

After a lot of research and return of quote on different system constructive, I would be starting on a product called Legnobloc self-construction.

A video on youtube:

http://www.youtube.com/watch?v=gs035uX8fKY
https://www.econologie.com/legnobloc-par ... -4334.html

A reseller in France:

http://www.bionergies.eu/

Price:

http://www.bionergies.eu/LegnoDocExtern/BdClegno01.pdf

By cons I am looking for a person with feedback on this type of product.

Thank you
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by Christophe » 13/02/11, 18:22

It's interesting.

Warning, contrary to what we could see a priori, it is not concrete but agglomerated wood block with an insulating block of polystyrene in which a concrete is poured (for rigidity).

It reminds a pool construction technique except that the blocks are 100% polystyrene.

Technical Info:

Image

After seeing the implementation and the econological cost ...
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by Christophe » 13/02/11, 18:39

After some checks, I still have trouble understanding how we get to 6.09 R on the 37.5 cm block:

LEGNOBLOC C 37,5 cm - R: 6,09 - 15cm PSE graphite + 14 cm concrete


It's a mean lambda 0.375 / 6.09 = 0.062, there are plenty of so-called insulating materials that are not so good!

For example, the best cellular concretes (400 density) are at 0.16 cf https://www.econologie.com/isolation-pou ... -3474.html and there is not a gram of traditional concrete in it.

Details:

15cm from PSE to 0.04 lambda gives R = 0.15 / 0.036 (if extruded PSE, it speaks of expanded in the video) = 4.17

14 cm of concrete R = very close to 0 with lambda = 2 one has 0.14 / 2 = 0.07

There remains 37.5 - 15 - 14 = 8.5 cm of block wood cement.

To obtain R = 6.09 it is therefore necessary that these 8.5 cm insulate from 6.09 - 4.17 - 0.07 = 1.85 or a lambda "wood cement" of 0.085 / 1.85 = 0.046 which is very close to insulation alone (0.04).

In short, it seems very optimistic.

Or is there a greed in my estimation?

Otherwise I saw the video completely, the implementation seems very interesting, cons must provide electricity and various plumbing before pouring concrete if you want to enjoy the ease of work blocks!

Is there a point left? That of the differential expansion of concrete and block but I guess it has been taken into account or that it is negligible.

In any case ... on paper it is very attractive!
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by Christophe » 14/02/11, 10:38

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Technical document of the Legnobloc




by fabio.gel » 16/02/11, 14:11

Christophe wrote:After some checks, I still have trouble understanding how we get to 6.09 R on the 37.5 cm block:

LEGNOBLOC C 37,5 cm - R: 6,09 - 15cm PSE graphite + 14 cm concrete


It's a mean lambda 0.375 / 6.09 = 0.062, there are plenty of so-called insulating materials that are not so good!

For example, the best cellular concretes (400 density) are at 0.16 cf https://www.econologie.com/isolation-pou ... -3474.html and there is not a gram of traditional concrete in it.

Details:

15cm from PSE to 0.04 lambda gives R = 0.15 / 0.036 (if extruded PSE, it speaks of expanded in the video) = 4.17

14 cm of concrete R = very close to 0 with lambda = 2 one has 0.14 / 2 = 0.07

There remains 37.5 - 15 - 14 = 8.5 cm of block wood cement.

To obtain R = 6.09 it is therefore necessary that these 8.5 cm insulate from 6.09 - 4.17 - 0.07 = 1.85 or a lambda "wood cement" of 0.085 / 1.85 = 0.046 which is very close to insulation alone (0.04).

In short, it seems very optimistic.

Or is there a greed in my estimation?

Otherwise I saw the video completely, the implementation seems very interesting, cons must provide electricity and various plumbing before pouring concrete if you want to enjoy the ease of work blocks!

Is there a point left? That of the differential expansion of concrete and block but I guess it has been taken into account or that it is negligible.

In any case ... on paper it is very attractive!


hi Christophe

on the following link:

http://bionergies.eu/LegnoDocExtern/certificazione_DIBT.pdf

in the end there is the data Italian certification of the product.
It is true that they did not go through L'ARCEMI but they have a European reference.

Fab
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by ojal » 09/04/11, 14:56

Hello,

Due to the non-uniform presence of polystyrene insulation, I feel that this product is full of thermal bridges? Have you analyzed these aspects of inhomogeneity of the structure of the wall made?

In return, I find this process a priori more interesting than polystyrene blocks to bancher ...

I'm going to dig ...
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Re: Isolated reinforced concrete wall Legnobloc




by Christophe » 26/05/16, 15:13

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