MyFloridaCode.com

Hello-

I don't' know about the first two but we have done some research on the
third, as it relates to whether a moisture barrier is required under a
truss that sits on the top of a masonry wall.

Going back to Standard Building Code days, we could not find a
requirement that wood bearing on the top of a masonry wall (more than 8"
above ground) required a moisture barrier or preservative treatment.  

However, I note that there is a new section in the 2007 FBC, Section
2304.11.2.2, Wood supported by exterior foundation walls, that states:
"Wood framing members, including wood sheathing, that rest on exterior
foundation walls and are less than 8 inches (203 mm) from exposed earth
shall be of naturally durable or preservative-treated wood. Wood framing
members and furring strips attached directly to masonry or concrete
walls shall be of approved naturally durable or preservative-treated
wood."

 

This second sentence has two bars next to it, indicating it is a Florida
Specific amendment.  Since the title of the section is "Wood supported
by exterior foundation walls", does this meant the second sentence only
applies to wood attached to foundation walls?  I hope that would be the
interpretation, or else all roof trusses are going to have to start
being treated.  

 

Check the rest of 2304.11.2 for the different situations where wood is
required to be treated when in contact with masonry or concrete.  

 

In the HVHZ, the answer is more clear.  It looks like there are three
options:  treated wood plate, approved metal saddle, or treated/durable
wood.

2319.3.2.1 Joists and rafters may bear on and be anchored by steel strap
anchor embedded into a grout filled cell of the masonry or reinforced
concrete, as described in Sections 2321.5.1, to a wood plate provided
such wood plate is of an approved durable species or pressure treated
with an approved preservative and such plate shall be not less than 2
inch by 4 inch (51 mm by 102 mm) and attached as per Section 2318.1.4.1.
The net uplift on the plate shall be limited to 300 pounds per foot
(4378 N/m).

2319.3.2.2 Joists and rafters may bear on a Product Approved
channel-shaped metal saddle and fastened to the masonry by a steel strap
anchor embedded into a grout filled cell of the masonry or concrete.

2319.3.2.3 Joists and rafters may bear on masonry, provided that each
joist or rafter in contact with masonry is of an approved durable
species or pressure treated with an approved preservative and anchored
as in Section 2319.3.2.2 above.

Even though these sections specifically say "joists and rafters", I
assume they would apply to trusses also since the overall section title
is "HORIZONTAL FRAMING".  

 

Randy Shackelford

Simpson Strong-Tie Co.

800-999-5099

rshackelford at strongtie.com

 

 

________________________________

From: codetalk-bounces at myfloridacode.com
[mailto:codetalk-bounces at myfloridacode.com] On Behalf Of Bryan Holland
Sent: Wednesday, November 25, 2009 6:35 AM
To: Building Officials Association of Florida, Inc.;
codetalk at myfloridacode.com
Subject: [Florida Code Talk] Misc. Policy and Practices Questions

 

Good Morning Everyone,

 

I have a series of questions that are addressed by the code but are
practiced and enforced widely from jurisdiction to jurisdiction.  Please
reply with your code references and/or comments.

 

1. Can rebar or other metallic materials be used as depth gauges and /
or conduit support in footings?  Meaning, the rebar or conduit is driven
into the earth and will also be encased in the footing (burning the
form)...

 

2. Can vertical steel reinforcement be "wet-set" into footings, or
should the rebar be "tied-in" to the footing steel?

 

3. Can non-treated wood products be in contact with masonry or concrete
without other forms of decay protection such as felt paper?  This
includes locations above 6" of grade.

 

Thanks in advance for your opinions...

 

 

 

Bryan P. Holland

City of North Port

4970 City Hall Blvd.

North Port, FL 34286

(941) 429-7053

bholland at cityofnorthport.com

www.iaeifl.org <http://www.iaeifl.org> 

www.boaf.net

 

 

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