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dry rot

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To add to Nels' comments, the USDA Forest Products Lab publishes a document
called the Wood Handbook. Chapter 13 on Biodeterioration of Wood states the

In making repairs necessitated by decay, every effort should be made to correct
the moisture condition that led to the damage. If the condition cannot be
corrected, all infected parts should be replaced with preservative-treated wood
or with all-heartwood lumber of a naturally decay-resistant wood species. If the
sources of moisture that caused the decay are entirely eliminated, it is
necessary only to replace the weakened wood with dry lumber.

Here's a link to that document for further review including reference to some
chemical treatments


Buddy Showalter, P.E.

To: seaint(--nospam--at)
From: Kipp.A.Martin(--nospam--at)

A coworker of my wife's has asked me if I know of any web sites that
discuss the repair and elimination of dry rot in stud walls.  Specifically,
she wanted to know if there is some chemical or other treatment that will
stop the fungus.  Can anyone offer me any leads?

--Kipp Martin

From: "Nels Roselund, SE" <njineer(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Re: Repair of Dry Rot


Dry rot is caused by a fungus that becomes dormant when there is no moisture
present.  However, its spores remain in the dry wood and are reactivated by
a return of moisture.  Finding and permanently arresting water at its source
is the best way to stop dry rot.

The spores can be killed by heat -- I've heard 150 degrees F will do it.
But permanently stopping the moisture at its source is really what you need
to do.

Nels Roselund
Structural Engineer
South San Gabriel, CA

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