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Construction Lumber
Welcome to Cobb Lumber!

We are a family owned business that has been providing services and products to the construction industry since 1978.

Combined, our family has over 90 years of experience in the building materials industry. We service the requirements of professional industry buyers, residential and commercial contractors, home owners and hobbyists.
Featured Items

TREATED LUMBER

" Cobb treated lumber lasts a full 30 years!"

COBB LUMBER SUPPLIES TREATED LUMBER AND TIMBERS FOR A VARIETY OF APPLICATIONS: ROADWAY AND RAILROAD BRIDGE BUILDING, HOME CONSTRUCTION, POLE BARNS AND OTHER FARM STRUCTURES, HOUSE PILING, PIERS, MARINES, AND OTHER WATER FRONT STRUCTURES.

ALL ITEMS ARE TREATED TO THE LATEST AMERICAN WOOD-PRESERVERS ASSOCIATION ( AWPA ) STANDARDS. TREATMENTS AVAILABLE INCLUDED: CREOSOTE, PENTA AND CCA. DIFFERENT TREATMENT RENTENTIONS ARE AVAILABLE FOR THE INTENDED USE. IF YOU HAVE A QUESTION ABOUT WHAT RENTENTION IS NEEDED FOR YOUR APPLICATION PLEASE LET ONE OF OUR SALESPERSONS HELP YOU.

Is your wood good for 30 years? Three Points to Check:

1. Does the preservative used in the treatment conform with all AWPA standards?

2. Has the wood been pressure treated by AWPA standards?

3. Has the moisture content been reduced sufficiently before treatment by one of the following methods: air seasoning, kiln drying, steaming, or a combination of these?


It is absolutely necessary to have this moisture content reduced in order to get proper penetration of preservative required for long life.


Leave out any one of these three and your wood has little chance of lasting. In fact, any wood not properly treated will decay in two to twelve years, depending on soil conditions.

Use Guide For Creosote, Penta, and CCA

UC1 - Wood and wood based materials used in interior construction not in contact with the ground or foundations. Such products are protected from weather and interior souces of water such as leaking plumbing, condensate, pools and spas.

SERVICE CONDITIONS: Interior Construction, dry, above ground

USE ENVIRONMENT: Continuously protected from weather or other sources of moisture

COMMON AGENTS OF DETERIORATION: Insects only

TYPICAL APPLICATIONS: Interior contstruction

UC2 - Wood and wood based materials used for interior construction that are not in contact with ground, hUlmay be subject to dampness. These products are continuously protected from the weather, but may be exposed to occasional sources of moisture.


SERVICE CONDITIONS: Interior construction, damp above ground.


USE ENVIRONMENT: Protected from weather, but subject to sources of moisture.


COMMON AGENTS OF DETERIORATION: Decay fungi and insects.

TYPICAL APPLICATIONS: Interior construction -beams, timbers, flooring, framing, millwork, sill plate

UC3A - Wood and wood based materials used in exterior construction tbat are coated and not in contact with the ground. Such products may be exposed to the full effects of weatber, but are in vertical exterior walls or otber types of construction that allows water to quickly drain from the surface.


SERVICE CONDITIONS: Exterior construction, coated, rapid water runoff, above ground


USE ENVIRONMENT: Coated. Exposed to all weather cycles, but not exposed to prolonged wetting.


COMMON AGENTS OF DETERIORATION: Decay fungi and insects


TYPICAL APPLICATIONS: Coated millwork, siding and trim

UC3B - Wood and wood based materials used in exterior construction and not in contact with the ground. Materials do not require an exterior coating, but may be finished to achieve a desired aesthetic appearance.


SERVICE CONDITIONS: Exterior construction, above ground, uncoated or poor water runoff


USE ENVIRONMENT: Exposed to all weather cycles and prolonged wetting


COMMON AGENTS OF DETERIORATION: Decay, fungi, and insects


TYPICAL APPLICATIONS: Decking, deck joists, sills, walkways, railings, fence pickets

UC4A - Wood and wood based materials used in contact witb tbe ground, fresh water, or other situations favorable to deterioration.

SERVICE CONDITIONS: Ground contact or fresh water, non-critical components


USE ENVIRONMENT: For normal ground or fresh water contact. Exposed to all weather cycles


COMMON AGENTS OF DETERIORATION: Decay fungi and insects


TYPICAL APPLICATIONS: Fence posts, deck posts, structnrallumber and timbers, guardrail posts, utility poles in regions of low decay potential

UC4B - Wood and wood based materials used in contact with the ground either in severe environments, such as horticultural sites, in climates with a high potential for deterioration, in critically important components.


SERVICE CONDITIONS: Ground contact, fresh water, important construction components, or in salt water splash zones


USE ENVIRONMENT: Severe ground contact or salt water splash. Difficult replacement. Exposed to all weather cycles.


COMMON AGENTS OF DETERIORATION: Decay fungi and insects with increased potential for biodeterioration


TYPICAL APPLICATIONS: Permanent wood foundations, building poles, horticultural posts, utility poles, decking or above tidal zone structural components in piers or docks, In regions of high potential for decay.

UC4C - Wood and wood based materials used in contact with the ground either in very severe environments or climates demonstrated to have extremely high potential for deterioration and in critical structural components.


SERVICE CONDITIONS: Ground contact, fresh water, critical structural components


USE ENVIRONMENT: Very severe ground contact. Exposed to all weather cycles. Extreme decay potential.

 

COMMON AGENTS OF DETERIORATlON: Decay, fungi, and insects with extreme potential for biodeterioration.


TYPICAL APPLICATIONS: Land or fresh water piling, foundation piling, utility poles with a severe potential for decay.

UC5A - Wood and wood based materials exposed to salt and brackish water generally from New Jersey and north on the east coast and north of San Francisco on the west coast to the extent that the marine borers can attack them.


SERVICE CONDITIONS: Salt or brackish water and adjacent mud zone


USE ENVIRONMENT: Continuous marine (salt water) exposure


COMMON AGENTS OF DEfERIORATION: Salt water organisms; Teredo, Limnoria quadripunctata


TYPICAL APPUCPinONS: Piling, bulkheads, bracing

UC5B - Wood and wood based materials exposed to salt and brackish water between New Jersey and Georgia on the east coast and south of San Francisco on the west coast to the extent that the marine borers can attack them.


SERVICE CONDITIONS: Salt or brackish water and adjacent mud zone


USE ENVIRONMENT: Continuous marine (salt water) exposure


COMMON AGENTS OF DETERIORATION: Salt water organisms; Teredo, Limnoria tripunctata


TYPICAL APPLICATIONS: Piling, bulkheads, bracing

UC5C - Wood and wood based materials exposed to salt and brackish water south of Georgia and along the Gulf coasts in the east

SERVICE CONDITIONS: Salt or brackish water and adjacent mud zone


USE ENVIRONMENT: Continuous marine (salt water) exposure


COMMON AGENTS OF DETERIORATION: Salt water organisms; Teredo, Martesia, Sphaeroma


TYPICAL APPLICATIONS: Piling, bulkheads, bracingrn US to the extent that the marine borers can attack them.

UCFA - Wood and wood based materials intended for fire protection and used in interior construction where wood material is not in contact with the ground and is protected from exterior weather.


SERVICE CONDITIONS: Fire protection as required by codes. Above ground interior construction.


USE ENVIRONMENT: Continuously protect from weather or other sources of moisture


COMMON AGENTS OF DETERIORAIION: Fire


TYPICAL APPLICATIONS: Roof sheathing, roof trusses, studs, joists, paneling

UCFB - Wood and wood based materials intended for fire protection and used iu exterior construction that is not in contact with the grouud or with foundations, but may be exposed to full effects of weather such as intermittent rain, dew, sunlight and wind.


SERVICE CONDITIONS: Fire protection as required by codes. Above ground exterior construction.


USE ENVIRONMENT: Wetting


COMMON AGENTS OF DETERIORATION: Fire


TYPICAL APPLICATIONS: Vertical exterior walls, inclined roof surfaces or other types of construction that allow water to quickly drain from surface.

 

Click Here To View The Specification Guide To Treated Wood End Uses

Information provided by the Wester Wood Preservers Institue

 

 


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Toll Free Phone: 888-452-3930 | Phone: 936-254-9901 | FAX: 936-202-2395 | PO Box 806 | Hwy 59 North | Timpson, TX 75975
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