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RE: Moisture protection for deck?

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Hi Bill,

Enclosing the deck from the underside would promote decay/rot unless the 
framing envelop is fully insulated or properly vented.  You are likely 
aware of that.  Are you using pressure treated lumber and sheathing?  Is 
the deck attached to a structure or free standing?

Ricardo G. Gonzalez, P.E.
C S W | S T 2
CSW/Stuber-Stroeh Engineering Group, Inc.
45 Leveroni Court, Novato, CA  94949
Civil Engineering ∙ Structural Engineering
Planning ∙ Land Surveying & Mapping

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-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Andrew Kester Sent: Friday, January 10, 2014 9:05 AM
To: seaint-seaosc(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] Moisture protection for deck?

Is the space under the deck going to be habitable or a patio or something 
used by the owners? Why is the bottom being sheathed?

Stucco is an OK moisture barrier for wall systems, at best. Do no use it 
for this application.

Andrew Kester, PE

On Thu, Jan 9, 2014 at 2:07 PM, T. William (Bill) Allen, S.E. < 
bill(--nospam--at)> wrote:

> I am designing a pretty large wood deck over a slope in Laguna Beach, CA.
> I am concerned about moisture intrusion for the underside of the deck.
> I am planning to sheathe the bottom, but is there something I can
> apply over the sheathing which would have a good chance of sealing the
> deck? My first thought was stucco, but there has to be something
> better/cheaper/easier. It will not be seen by anyone not directly
> under the deck.

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