Moisture decay (Dry-Rot) of Wood Sill Plates

[VBI]

Can someone provide information regarding references on analyzing moisture decay on wood sill plates? That is, I am evaluating decay on a wood sill plate and the "threshold" on when the sill plate should be replaced. Thank you.

 

[civilperson]

Treated wood can last thirty to fifty years. Check with ice pick type probe for hidden rot or decay, Epoxy mix can repair nominal voids, (up to 20% of volume).

 

[DCEngr1]

"Dry rot" is a misleading vernacular term. In order for decay to occur, wood must be at ~ 20% moisture content and available to oxygen. Make sure you check the remaining structure, find the source of the moisture intrusion (water or vapor), & determine a flashing, other weatherproofing detail, or other component or moisture control system (ventilation, drainage) to prevent the problem from re-occurring.

 

[dik]

There is an excellent article in the Encyclopedia of Wood by Stirling Publishers, Chapter 17...

Dik

 

[VBI]

I understand but when viewing mold laden wood sills...at what threshold is it required for replacement. Or is this strictly a judgement call by the PE.

 

[dik]

You have to be very careful, if this is load carrying, by the time dry-rot is visable, you may have lost 30% of your strength...

I'll see if I can scan a couple of pages from the Encyclopedia of Wood and post them. This should be covered by fair use.

Dik

 

[MiketheEngineer]

And how are you going to get rid of the mold??