Impregnation of wooden roof structure

Hello home builders,

briefly upfront: great forum! I have been an avid reader for a long time, but now I finally have a question myself shortly before our construction start.

Our general contractor wants to build our roof structure with impregnated wood, specifically Impralit TSK 10.

Since we actually want to avoid any avoidable chemicals, the question now is whether an unimpregnated roof structure poses a risk. Does anyone of you have experience with forgoing impregnation? What should be considered? Unfortunately, there is not much information available online. At least for the interior, the product does not seem to be approved... and we surely want to use the attic somehow (at least for storage).

We would appreciate feedback and help with the decision!

Hello,

we are currently facing the same question.

How did you decide and what was ultimately the deciding factor?

For us, it is supposed to start this month, the roof frame will most likely get rain before the tiles are on.

I had the impression that wood in house construction (interior) is no longer treated... (Is it allowed to treat?)
You just have to design everything constructively so that the wood does not get wet / is properly ventilated.

We have received a note to sign. It states that the impregnation is no longer necessary because of insects, but there are no long-term experiences yet, and it is also impregnated against wood-destroying fungi.

Hello,

exciting that a reaction is actually coming again ;-)

Our decision had to be made already: we decided against impregnation. On the one hand, according to DIN impregnation is apparently no longer intended anyway, and on the other hand we don’t want to read a study in 10 years proving our currently oh-so-good product to be harmful to health. Because basically every herbicide or fungicide is pure poison. If the impregnated wood is behind the vapor barrier, I still have an attic... and who knows what we might want to do with it someday.

Rain during the construction period shouldn’t be that bad, the wood can dry again, our expert also said. Only during the screed phase is opening the attic hatch taboo.

I also tend to omit it, although the risk is certainly limited if the treated wood is behind the vapor barrier. The attic will always remain a storage area for us.