application of gas laws to home mold problems

Mayz

PS from May - Just reread my recent post and see it needs a correction - Paecilomyces grows out yellow on a Petri dish with MEA - not sure what color it would be on wood, if visible. Because it looks like Penicillium under the microscope, my mind jumped to "green."

dbromwich

Chemical diffusion is all about chemical gradients, not pressure. If there are holes in a wall, then pressure is an issue. Pressurising to prevent gases diffusing is pointless as it won't make much difference to any chemical gradient.
Sounds like you have a huge problems on your hand if the wall cavities are affected.
I'm not too sure what "gases" you are testing for. Sometimes the most toxic emissions are at very low levels and hard to pin down.