Mold?

[thomaslj]

Hello

Can anyone say if this is mold on the boards or if it's something else?

Could it be old mortar? If these pieces of wood were used when the floor was poured or something similar?

 

[Stefan1972]

If it's the one on the left you mean, it could be casting residue you're referring to. Considering that it's used timber, it's not unlikely. I don't see any mold, anyway.

 

[thomaslj]

If it's the one on the left you mean, it could be casting residues you are referring to. Considering that it's used timber, it's not unlikely. I don't see any mold anyway.

What do you think about these spots? Partly on insulation and partly on a sheet lying in the attic

 

[useless]

Probably mold, but in such small amounts that it's nothing to worry about. Keep an eye on if things change.

 

[Oldboy]

Could very well be some local mold spots, but it could also come from insects, or rodents or birds.
It's also not uncommon for some drifting snow to get in.
It looks like an older house, so any possible mold spots after 50 - 100 years indicate a functioning environment. (Okay, it's probably additionally insulated in more recent times so maybe more like 20 - 50 years, but it's still a fairly long time.)
If that's all there is in the attic, it doesn't seem to be any problems.

 

[thomaslj]

It could very well be some local mold spots, but it could also come from insects, or rodents or birds.
It is also not uncommon for some drifting snow to get in.
It looks like an older house, so a few potential mold spots after 50 - 100 years indicate a functioning environment. (Okay, it is probably additionally insulated in more recent times so maybe more like 20 - 50 years, but it's still a fairly long time.)
If that's everything in the attic, it doesn't seem to be any issues.

Well, we have this little detail with:


But we're planning to change the roof next year, so we'll replace the tongue and groove here. Our problem stems from a bad odor in the attic, but we've determined that it's the old insulation. Filled with old rårrgift since installation so it's a massive mouse graveyard up there.

 

[Oldboy]

Aha, seems to be due to some leak, otherwise the nail board should also have been black.

Yep, old rodent-infested places indoors usually smell a bit musty in a moderately humid environment...