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Post-Frame Building Materials

National Barn Co. Post-Frame Building Materials
National Barn Company’s construction methods are in compliance with the standard industry tolerances as designed by the National Frame Building Association. Some changes can be made to comply with local building restrictions, if applicable. Engineered buildings with a PE stamped drawing are also available, if required. Our sales representatives can answer any of your questions.
Our Buildings Consist of:
Framing Diagram
National Barn Standard Framing Diagram
Download Framing Diagram: CLICK HERE
Framing Diagram
Exterior Metal
  • #1 American Made Metal, 9 inch Ribbed Panel
  • 26 Gauge Painted, Galvalume or Galvanized
  • Warranty
  • 29 Gauge Painted, Galvalume or Galvanized
  • Warranty
  • 40-year Manufacturer’s Limited Warranty
Painted Metal
Poles & Bottom Plate
  • Posts are solid sawn 5 x 5 or 6 x 6 depending on the height of the building.
  • Glue or laminated columns are used for longer lengths and are optional for all columns.
  • # 2 Southern Yellow Pine lumber is standard.
  • .40 CCA treatment is standard, .60 CCA treatment are optional.
  • Post spacing is typically 10' centers (8' or 12' centers are optional).
  • Post depth is a minimum 3' deep (based on level ground).
  • Posts can be set deeper to meet some code restrictions, for additional cost.
  • Bottom Plate is a treated 2 x 6. This board can be used as a form for the concrete slab.
Treated Bottom Plate
Top Plate
  • Top Plate supports the trusses and is anchored to every post.
  • Double 2 x 6 is the minimum size.
  • 2 x 8s, 2 x 10s, or 2 x 12s are also used, based on the width of the building.
  • LVL lumber is used for large spans or wide openings.
  • # 2 Southern Yellow Pine lumber is standard.
Double Top Plate
Wall Girts
  • 2 x 4s spaced 24” apart for metal attachment.
  • 2 x 6s are used in some instances.
  • # 2 Southern Yellow Pine lumber
Wall Girts
Factory Engineered Trusses
  • Trusses are typically constructed of 2 x 6 rafter and ceiling joist with 2 x 4 braces, and are engineered for the location and the purpose that they are being used.
  • Engineered Trusses will typically include # 2 SYP lumber for the top and bottom chord, and some #3 SYP may be used for bracing.
  • Standard Truss spacing is 5’ centers.
  • Alternate truss spacing can be 2', 4',5' or 6' centers, based posts spacing and use of truss.
  • Standard roof pitch is 3/12.
  • Alternate roof pitch can be 4/12, 5/12, 6/12, 7/12 or 8/12 (steeper pitches are more expensive).
Factory Trusses
Roof Purlins
  • Roof Purlins are used to tie the trusses together and provide metal attachment.
  • 2 x 4s spaced 2' apart.
  • # 2 Southern Yellow Pine lumber
Roof Purlins
  • Screws are used to anchor the metal to the framing
  • Screw heads are painted to match the metal
Metal Fasteners
Note: All lumber is #2 or better SYP (truss bracing may be #3 grade). Lumber that has ground contact is fully treated. Treated lumber has a lifetime manufacturer's limited warranty. Lumber can be upgraded for additional cost, or modified to meet local building restrictions.

National Barn Company

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National Barn Brad PaisleyNational Barn Company was extremely professional and courteous. From start to finish, I was impressed with the quality of the construction and the level of service and integrity I found at National Barn Company. I got a very unique and custom designed barn for a very good price. I'll recommend National Barn Company to my friends and neighbors.

Thanks again,
Brad Paisley


On time and on budget, National Barn was a pure pleasure to work with. We received bids from 4 other barn builders, they all said they could not come close to the price and quality that National Barn offered.

Brad and Christine
Castle Rock, CO

We had a great experience working with National Barn. Your staff and crew are a pleasure to do business with. We have already recommended National Barn to our neighbors who are looking to build a barn in the near future. Thanks again.

Brett B
Colorado Springs, CO

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National Barn Sales Divisions and Locations
Brad Paisley Used National Barn Co. For His Barn
Post-frame Construction Industry Since 1992