We are going to build split-level houses.
One of the foundation contractors we discussed with suggests Leca with internal insulation. Outside the Leca, he wants a Platon sheet and then plaster. So, Platon sheet even on the parts above ground.
Anyone with experiences or opinions?
Another person we spoke to wants roughly the same solution but only Platon below ground. Plaster directly on the Leca blocks above ground.
One of the foundation contractors we discussed with suggests Leca with internal insulation. Outside the Leca, he wants a Platon sheet and then plaster. So, Platon sheet even on the parts above ground.
Anyone with experiences or opinions?
Another person we spoke to wants roughly the same solution but only Platon below ground. Plaster directly on the Leca blocks above ground.
Okay, that sounded a bit odd. I must have misunderstood.
I think I've heard about a special plaster mat made by the platon company, there is already a plethora of mats platon; blue floor, platon original etc… if that's what he means, where there is a type-approved system maybe it's okay. Personally, I would find it a bit strange to have a plastic layer around the entire house.
Kind regards, plexi
Kind regards, plexi
I am in the same position, but most people warn against internal insulation. I am now considering blocks from HH Celcon, a 350mm block that is better than isoleca in terms of sound insulation. They are in the same price range. Going to look at such a house on Friday. Is it just the lower floor that will be in concrete, the rest in wood?cat_stevens said:
I am in the same situation!
Insulated interior walls with wooden studs that have an air gap against 29 cm lecablocks.
Now I am having a dialogue with the mason about whether we should use platon or isodrän. He feels that it seems strange with isodrän because it insulates the wall between two insulations, the outer and inner. He advocates for platon in that case because it provides a nicer transition from above ground than with wider isodrän and that it's completely unnecessary to have insulation on the outside if you have it on the inside.
I don't know?!?
At the same time, all other installations become significantly worse if you DON'T have insulated interior walls. Thinking about electricity and similar in that regard.
In our case, not much of the first floor is below ground and we have a good plot for the purpose, so it can't be compared to a regular basement.
Insulated interior walls with wooden studs that have an air gap against 29 cm lecablocks.
Now I am having a dialogue with the mason about whether we should use platon or isodrän. He feels that it seems strange with isodrän because it insulates the wall between two insulations, the outer and inner. He advocates for platon in that case because it provides a nicer transition from above ground than with wider isodrän and that it's completely unnecessary to have insulation on the outside if you have it on the inside.
I don't know?!?
At the same time, all other installations become significantly worse if you DON'T have insulated interior walls. Thinking about electricity and similar in that regard.
In our case, not much of the first floor is below ground and we have a good plot for the purpose, so it can't be compared to a regular basement.
One becomes a bit confused by this actually. In all books about basements or semi-basements, it states that one should insulate on the outside. Likewise, most experts on the forum seem to agree.
But... we have received proposals and quotes from 4 different foundation/builder contractors, and they all suggest leca and interior insulation.
We also mostly have above-ground, so it should probably work with Platon and interior insulation??
But... we have received proposals and quotes from 4 different foundation/builder contractors, and they all suggest leca and interior insulation.
We also mostly have above-ground, so it should probably work with Platon and interior insulation??
Hey ho... I almost decided on Isodrän.
My latest reasoning is based on:
...if you insulate on the outside, nothing is needed on the inside.
Then you get a warm basement wall that transports indoor air moisture from the warm wall to the Isodrän.
The dew point then ends up in the wall, near the outside.
If you reverse it and only insulate inside, it should mean that the dew point ends up deeper in the wall and in the worst case on the surface of the Leca wall, like on the outside of a large foaming ice-cold beer glass on a warm summer day.
To push the dew point out again, external insulation should help. I saw a post where Isodrän had said that you should have double insulation outside compared to inside, so insulation inside and uninsulated Platon outside should be a really bad alternative. Better then with Isodrän outside, and best with double layers, but if you have 29 cm Leca, the amateur I think a single Isodrän should suffice.
But I don't know. And no one seems to be able to give a straight and correct answer.
Right now, we're leaning towards Isodrän on the outside.
My latest reasoning is based on:
...if you insulate on the outside, nothing is needed on the inside.
Then you get a warm basement wall that transports indoor air moisture from the warm wall to the Isodrän.
The dew point then ends up in the wall, near the outside.
If you reverse it and only insulate inside, it should mean that the dew point ends up deeper in the wall and in the worst case on the surface of the Leca wall, like on the outside of a large foaming ice-cold beer glass on a warm summer day.
To push the dew point out again, external insulation should help. I saw a post where Isodrän had said that you should have double insulation outside compared to inside, so insulation inside and uninsulated Platon outside should be a really bad alternative. Better then with Isodrän outside, and best with double layers, but if you have 29 cm Leca, the amateur I think a single Isodrän should suffice.
But I don't know. And no one seems to be able to give a straight and correct answer.
Right now, we're leaning towards Isodrän on the outside.