Fire retardent OSB

[Carl A. Brown]

Marcel,

That is just gross.

[Brian A. MacNeish]

Originally Posted by cbrown1

OSB = Mold candy

Carl:

If you let water continually get at any wood product (except preservative treated and rot resistant species), it's going to support mould/rot. It's just that OSB came on big in the last 20-25 years when building practice common sense went out the window (poor/non-existent flashing details) , houses got more airtight at the walls/windows (housewraps creating more stack/chimney effect for moist air to rise to the attics) without compensating with good interior venting practice (bath fans dumped into attics).......all these other items/problems were blamed on the OSB.......Hell!, it couldn't be me, the builder, causing this mould/rot from not knowing what I'm doing and that buildings have changed in nature.....gotta be the poor sheathing.

I'd use OSB board any day......though not on walls......insulation sheathing only!!!!

[Marcel R. Cyr]

I agree Brian, OSB is not the problem.

Keeping moisture and water away from it is.

Knowing how to prevent it from moisture and water is.

Having builders know how to keep moisture and water from it is.

Not enough education on building science for builders is.

Until that is corrected, we will continue to have problems.

Education is the key word here.

Let us all Members/non-members chip in and educate some of these clients.

Marcel

[Carl A. Brown]

I know guys!

But everytime it ROTS around here they blame the stucco.

[Marcel R. Cyr]

Thread drift, I think we need to get back on track for this Member which was Fire Rated OSB.

Any contributions anyone?

Marcel

[Kenton H. Shepard, CMI]

Originally Posted by mnicholet

It is my understanding that mould (dead mould) can re-activate under the right conditions.

It's not dead. Mold fungi without adequate conditions goes dormant and can stay that way for a long time. Some types of mold fungi can survive surprisingly nasty conditions and then once again start reproducing and releasing spores once they find adequate conditions again. Food (even dust), adequate moisture and correct temperature window. Somewhat mold species specific, but generally 20% - 90% moisture in materials and 50 - 85 deg. F.