Yes, a W-8X18 will carry the weight of a basement load wall 2X6 over a 200 feet span.
You can get more insulation when using 2x6 studs rather than 2x4 studs
Laminating 2x6's is a much better idea, it won't twist like a PT 6x6, it is less expensive, and you can use a combination of lumber. I built a 24x 40 ' barn a few years ago for a woodworking shop. I used 4 pieces of 2x6, this gave me a doubled space at the top to slide in laminated doubled 2x12's ... I used 0.40 PT lumber at the bottom and regular KD above, I laminated the bottom with staggered board lengths... I used a 12, 10 and two 8 footers, I needed an 18 ' post to have 4' in ground and 14' above. I also used stainless steel nails below ground and regular above, a nail gun sure was handy. After the posts were in, I drilled holes and used a 6 inch 3/8th carriage bolt to reinforce the connection. I overbuilt my barn, went 8' on center, not 12'. Also I used a doubled 2x14 glue lam 40' long for the ridge, that way the building was clear span and I didn't put up collar ties. I used a regular plywood roof and shingles. I used one inch rough cut shiplap pine boards for vertical sheathing, came out nice.
you didn't say how large the floor was but you should be able to install new 2x6 joist supporting mid ro third span as required bobp
You must also take in consideration the width of the building. For instance a 12'x16' building you would use 2x6 rafters and a 2x8 beam with collar ties every 4'.
Using 2x6 pressure treated lumber for outdoor projects provides benefits such as increased durability, resistance to rot and decay, protection against insects, and longevity in outdoor environments.
To build a sturdy outdoor deck using 2x6 treated lumber, it is important to follow these best practices: Use pressure-treated lumber to prevent rot and decay. Ensure proper spacing between boards for water drainage and ventilation. Use galvanized or stainless steel fasteners to prevent rust and corrosion. Install proper footings and support posts to bear the weight of the deck. Regularly maintain and seal the deck to protect it from the elements.
A 2X6 (dry Douglas fir) weighs 2lbs per foot. Thus a 20ft 2X6 would weigh 40 lbs. Other types of lumber such as pine weighs more and all lumber is heaver when wet or if it has been treated.
Common treated lumber sizes available for purchase include 2x4, 2x6, 4x4, and 6x6. These sizes are commonly used for various construction projects and can be found at most hardware stores.
1 1/2"x 5 1/2"
2x4, 2x6 and 2x10
A 2x6 piece of lumber can typically support around 50 pounds per linear foot when used as a horizontal shelf. The actual weight it can hold will depend on various factors such as the type of wood, the length of the span, and the load distribution. It is always best to consult with an engineer or construction professional for specific load-bearing calculations.
The maximum allowable span for 2x6 deck joists is typically around 9 feet when using standard lumber and following building codes.
Common lumber sizes available for purchase at our store include 2x4, 2x6, 4x4, and plywood sheets in various thicknesses.
you build forms,lay in rebar,pore concrete,put in J bolts,to bolt your 2X6 pressure treated wood to.then floor joists.
Lumber yards and home improvement stores in the U.S. generally stock stud length 2x6's (92-5/8").
Standard lumber measurements used in construction projects include 2x4, 2x6, 2x8, 2x10, and 2x12, which refer to the dimensions of the lumber in inches. These measurements are commonly used for framing and structural components in buildings.