Basement construction - Thermowall VS masonry?

[plan-g]

I know there are some threads about Thermomur but I still can't find answers to the following.

This concerns an extension with a 75m2 basement to a house with an existing basement. The top will be a prefab wooden frame.

Suitable construction for basement walls? Thermomur or masonry?

Thermomur
* Advantages? Construction speed?
* Total cost compared to other solutions? Expensive?
* Feels strange to live in a styrofoam room that needs to be clad with, for example, gypsum?
* Are construction companies used to working with Thermomur?
* Lifespan? Does the plastic become brittle?
* Can you plaster directly on the inside to get a "basement feel"?
* Flammable?

 

[Plupp 405730]

I know there are a few threads about Thermomur, but I still can't find the answer to the following.

Regarding an extension with a 75m2 basement to a house with an existing basement. The upper part will be a prefab wood frame.

Suitable construction for basement walls? Thermomur or masonry?

Thermomur
* Advantages? Construction speed?
* Total cost compared to other solutions? Expensive?
* Feels strange to live in a styrofoam room that needs to be clad with, for example, plasterboard?
* Are construction firms used to working with Thermomur?
* Lifespan? Does the plastic become brittle?
* Can you plaster directly on the inside to get a "basement feeling"?
* Fire hazardous?

I would plaster both the inside and outside with at least 15-20mm of reinforced plaster to fireproof the styrofoam.
Yes, those who build with Thermo do it quickly, but I don't know if it becomes cheaper since it's not very common..
But if you plaster, I wouldn't worry about fire..

 

[plan-g]

Received a quote from a good concrete company

* Foundation slab 73m2 (excluding underfloor heating)
* Thermomur-construction for the basement
* Cast intermediate floor
* plus a foundation slab 40m2 garage

Just under 700k SEK

Having difficulty estimating if it would be cheaper with a different construction?

 

[Plupp 405730]

The only way is to get more quotes and get quotes with brick walls, otherwise it's not possible to compare.

 

[plan-g]

I would plaster both the inside and outside with at least 15-20mm reinforced plaster to fireproof the polystyrene.
Yes, those who build with thermo do it quickly, but I don't know if it becomes cheaper since it is not so common..
But if you plaster, I wouldn't be worried about the fire risk.

I would plaster both the inside and outside with at least 15-20mm reinforced plaster to fireproof the polystyrene.
Yes, those who build with thermo do it quickly, but I don't know if it becomes cheaper since it is not so common..
But if you plaster, I wouldn't be worried about the fire risk.

The Thermowall is now up and it's time to choose the covering for the inner walls.

Deciding between thick plaster or 22mm installation layer plus OSB plus gypsum.

The advantage of plaster is fire protection plus that it takes up less space?

Does anyone have any opinion on the workload/total cost between the methods?

 

[Plupp 405730]

The Thermomur is now up, and it is time to choose the cladding for the inner walls.

Deciding between thick plaster or alternatively 22mm installation layer plus OSB plus plasterboard.

The advantage of plaster is fire protection plus it builds less?

Does anyone have any opinion on the workload/total cost between the methods?

Plaster all days of the week..

 

[plan-g]

Plaster every day of the week..

The downside will probably be that it becomes difficult to screw things up? Will it even work?

That the electricity becomes surface-mounted probably doesn't matter.

 

[Plupp 405730]

The downside might be that it will be hard to screw things up? Will it even work?

Having the electricity on the surface probably doesn't matter.

Yes, in thick plaster it's possible to plug and screw things up...

 

[plan-g]

Yes, in thick plaster, you can plug and write things up...

Even relatively heavy things like clotheslines, wall cabinets, etc.?

 

[Plupp 405730]

Even relatively heavy things like clotheslines, wall cabinets, etc.?

Yes

 

[plan-g]

Which plaster should be used on the interior of Thermomur walls in a basement with regards to potential moisture migration etc.?

 

[Plupp 405730]

What type of plaster mix should be used on the interior of Thermomur walls in a basement considering potential moisture migration, etc.?

I would plaster with B mix or alternatively C mix.

 

[plan-g]

I would have plastered with B mortar alternatively C mortar..

Ok. Would you like to elaborate?

The builder recommends a 2-layer thin plaster that is fiber reinforced and reinforced with mesh in the first layer.

But then maybe you miss out on the whole point of fire protection and have difficulty screwing things up?

 

[Plupp 405730]

Ok. Want to elaborate?

The builder recommends 2 layers of thin plaster that is fiber-reinforced and reinforced with mesh in the first coat.

But then you might miss the whole point of fire protection and have difficulty mounting things?

Yes, he recommends more expensive products!
I would have plastered with plaster mortar B + regular steel mesh on the inside, 10-12mm of plaster in one coat is enough to save time..

 

[MathiasS]

Given all the crap that ALWAYS needs to be installed whether you like it or not, I would choose the solution with OSB if it is okay from a moisture standpoint. Any day of the week, even though I think plastered is nicer in a basement.