| Fasteners & Connections The use of proper fasteners and connections with treated Southern
Pine is very important. Properly treated Southern Pine will last several decades;
therefore, the hardware components should last just as long, or longer. Standard
carbon-steel nails and fasteners will rust and corrode with time, causing unsightly stains
and possibly an eventual failure to hold securely.
When building with CCA-treated Southern Pine, hot-dipped
galvanized or stainless steel 304 or 316 nails and fasteners should be used to resist
corrosion. All connecting hardware such as joist hangers hinges and post anchors, should
also be galvanized.
Permanent Wood Foundation (PWF) construction has special
requirements for fasteners and adhesives. Refer to the PWF Design & Construction Guide
(available from SPC) for details.
Handling & Storage
Recommendations
The pressure treatment of wood does not prevent the normal
passage of moisture in and out of the lumber, so proper storage (before and during
construction) is important. Treated lumber should be stacked and stored in the same manner
as untreated wood.
Where possible, job site fabrications cuts and borings
should be field-treated with copper naphthenate having a minimum of 2% copper metal, in
accordance with AWPA Standard M4.
Industrial Uses of Southern
Pine
Southern Pine's inherent characteristics of strength and
density, in addition to its availability and ability to be dried and conditioned, make it
an ideal choice for a wide range of industrial applications, including:
- Specialty Millwork & Interior Finish
- moulding, window & door components, beaded ceiling, flooring, paneling and siding.
- Furniture / Manufactured Goods -
wood household and upholstered furniture. Also ladders, scaffolding, stair treads, risers
and stepping.
- Materials Handling - pallets,
skids, crating, boxes, cable reels and export packaging.
Special Applications
PWF - The Permanent Wood
Foundation, or PWF, is a load-bearing, lumber-framed foundation wall sheathed with
plywood. All lumber and plywood used in the PWF are specially pressure treated with
preservatives to withstand decay from moisture and termite attack. Southern Pine lumber
used in a PWF is CCA-treated to a retention level of 0.60 lbs./ cu.ft., in accordance with
AWPA Standard C22. Pressure-treated lumber to be used in a PWF should be stamped
"FDN", "C22", or "PWF FOUNDATION."
Once the foundation walls are in place, standard framing
construction practices are followed for the structure above. Typically, floor joists are
installed on the top plate of the foundation wall. Subflooring and wall framing follow.
Plen-Wood - The Plen-Wood system
utilizes a sealed, insulated cavity to create an underfloor plenum. This system provides
uniform, efficient distribution of warm or cool air from a centrally located HVAC unit.
Plen-Wood walls are basically crawl space versions of the PWF.
High-Moisture Areas - Treated
Southern Pine offers added protection for residential and commercial building applications
where conditions of high moisture exist. Areas susceptible to regular wetting include
soffit and fascia at the roofline, as well as structural framing members in kitchens and
baths that are adjacent to plumbing.
Marine Grades - CCA-treated
Southern Pine is ideal for marine construction. According to AWPA standards, material
intended for freshwater use must be pressure treated to a retention level of 0.40
lbs./cu.ft. Material intended for saltwater use must be treated to a retention f 2.50
lbs./cu.ft. AWPA standards also make the distinction for "saltwater splash," for
which exposed lumber should have a minimum retention of 0.60 lbs./cu.ft.
A Southern Pine lumber grade description for "marine
Grades" has been published by SPIB, and is incorporated within the SPIB Standard
Grading Rules for Southern Pine Lumber, 1994 Edition. |
