Specifying IMPs? Experts Say Keep It Standard
By Randy Wilken and Craig Storch, P.E., Metl-Span
Standard sizing of lumber products began nearly a century ago to create a shared understanding between the lumber mills and the markets. Lumber products commonly traveled long distances by rail or water, making communication difficult. Standard sizes
helped create an understanding of value and accurate expectations.
Today, for instance, Metl-Span’s CF architectural insulated metal panels come in standard widths of 24, 30, 36 and 42 inches, as do most building products throughout the industry. In fact, Metl-Span produces standard products for some of the same
reasons as the lumber mills from 100 years ago.
Other Building Elements Come in Standard Sizes
Most insulated metal panels are installed vertically, but they can also be installed horizontally. The panel width is typically determined during the design phase and takes the building envelope into account, including openings for windows and doors.
One reason standard width wall panels are so popular is they correspond more easily to other building elements and the framing, which also come in standard sizes. Deviating from the standards creates design challenges and requires more attention to
Metl-Span's CF architectural panels come standard in the same dimensions as most other building products, for compatibility and economy.
Manufacturing Process Designed for Standard Widths
The manufacturing process is tooled to create standard products. Metal wall panels are made of steel coils that come in standard widths. Creating custom products requires an adjustment in the manufacturing process, making it more difficult to accommodate.
This added time and disruption of the manufacturing process makes it more expensive to produce custom products.
Custom Widths Available but More Costly
Designers sometimes select metal panels with custom widths so site lines align with the perimeter edge of the windows and doors. When considering custom widths, it is important to consider if the advantages outweigh the disadvantages.
Projects with panels containing customized measurements can be more time-consuming and expensive to construct. Most building elements come in standard widths, so it is essential to plan diligently for custom products to accomplish a cohesive final product.
Many of the metal panel profiles are not available in custom widths, leaving fewer panel options. This is because the profiles are designed for specific measurements. Some manufacturers offer custom sizes, but those are costlier. Most of the customizable
products either have profiles that are small and close together or the panels are flat, which make it easier to create custom widths without compromising the profile.
a Nucor company, manufactures insulated metal wall and roof systems for projects ranging from architectural to cold-storage. To learn more, visit www.metlspan.com.