Pressure-treated timber in the roof sheathing?

[Plupp 156978]

Hello! Yes, the problem persists. We have received confirmation via laboratory analysis that the raw lath contains pentachlorophenol. It has most likely been brushed on. The question now is whether there is anything else in the house that has been treated. Apparently, it wasn't uncommon for wood paneling and door/window frames to be treated this way. You mention rafters, something I've also been a little worried about. I also regret not taking more samples from studs in the interior walls when we renovated a few years ago, because that's the only way to find out.

We have held off on roof replacement since it's a very large expense. I'm currently experimenting with mechanical ventilation of the attic; creating negative pressure using a fan. This lowers the temperature in the attic and can lead to moisture problems, but given the circumstances it's worth a try. It seems to have some effect. Someone says that our indoor air has improved. However, I'm not so sure.

Hello! Yes, the problem persists. We have received confirmation via laboratory analysis that the raw lath contains pentachlorophenol. It has most likely been brushed on. The question now is whether there is anything else in the house that has been treated. Apparently, it wasn't uncommon for wood paneling and door/window frames to be treated this way. You mention rafters, something I've also been a little worried about. I also regret not taking more samples from studs in the interior walls when we renovated a few years ago, because that's the only way to find out.

We have held off on roof replacement since it's a very large expense. I'm currently experimenting with mechanical ventilation of the attic; creating negative pressure using a fan. This lowers the temperature in the attic and can lead to moisture problems, but given the circumstances it's worth a try. It seems to have some effect. Someone says that our indoor air has improved. However, I'm not so sure.

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[Okänd]

Would you like to write to me in PM?

Absolutely. Feel free to PM if you have questions or thoughts or want to share experiences.

 

[Nicklas92]

TS @Okänd is it the same object as in this thread?
[link]
Impregnerad Tretex used in the 70s as wind barriers has a pungent headache-inducing smell that many react to. When it was installed, there were no problems as they used vertical cladding on the outside! This was painted with a paint made of pigment, linseed oil, and turpentine! This paint was completely open and with the rough-sawn cladding boards, there were plenty of gaps to release the smell from the impregnation.
After 30-40 years, it was time to paint and renovate, and some replaced the cladding, and today it's dry and planed cladding on one side, making the wall too tight. At the same time, they paint with a completely sealed paint, so now the smell can't escape but is concentrated behind the cladding, which of course has no vents at the top.
At the same time, a new requirement was introduced for a negative pressure in the house via a central fan that should always run!
With a few mm of water column pressure difference between the strongly smelling Tretex and the residence, it doesn't take many months before the smell contaminates everything in the house, clothes, hair, beds, etc.

I have it in my house myself, but the boards have gaps 1 cm wide so the smell disappears, and only a fan over the stove, which rarely runs. And roof windows without sealing in the shower!

Hello there! I have Tretex as interior walls... could this possibly also be treated? I'm actively looking for something pressure-treated here at home but can't find anything... I've checked the sill and it isn't treated!

Now my suspicions are moving towards my tongued and grooved interior walls, that is, behind the Tretex...