The most cost-effective design for a pre-engineered metal building (PEMB) depends on several factors, including the building’s size, intended use, and local building codes.
However, some general guidelines help keep costs low while maintaining structural integrity:
1. Simple Rectangular Shape
A clear-span design (no interior columns) is more cost-effective for small to medium buildings, while multi-span (with interior columns) is better for wider structures.
Avoid complex layouts with multiple corners, wings, or irregular shapes. A basic 40×60 or 50×100 rectangular footprint is the most efficient.
2. Standard Roof Pitch
A 1:12 to 4:12 roof pitch is ideal. Lower slopes reduce steel usage, while higher pitches increase costs due to extra framing and materials.
3. Standardized Bay Spacing
25’ to 30’ bay spacing is optimal for balancing steel efficiency and cost. Closer bays increase steel usage, while wider bays may require heavier frames.
4. Minimal Customizations
Standard gable roofs are more affordable than complex rooflines (hip, mansard, or multi-level).
Limit the number of doors, windows, and framed openings to reduce framing costs.
Use standard insulation packages instead of custom solutions.
5. Economical Wall & Roof Panels
26-gauge PBR (Purlin Bearing Rib) panels are cost-effective and durable.
Choose galvalume roofing for long-term savings over painted panels.
Single-skin panels with standard insulation are cheaper than insulated metal panels (IMPs).
6. Foundation Considerations
A simple slab-on-grade foundation is the most cost-efficient. Avoid deep footings unless required for local soil conditions or heavy loads.
7. Optimize Steel Tonnage
Work with a PEMB manufacturer that value-engineers the design to minimize steel weight without sacrificing strength.
Limit mezzanines and heavy loads unless necessary.