Romtec uses tongue and groove (T&G) timber decking as the standard roof decking material on every building. T&G roof decking provides roofs with several advantages that make it ideal for pre-engineered buildings. T&G is the Romtec standard because of its durability, its variety materials, and its attractive appearance. These benefits ensure that every standard Romtec building is the best in terms of price and quality.
Roof decking is something that is difficult and expensive to replace. When installing a building, choosing the proper material for roof decking can eliminate a lot of concerns down the road. Compared to plywood, T&G roof decking is traditionally thicker by at least ¼”. Thicker decking gives a roof more rigidity, strengthening the structural effectiveness of the roof.
Improving the rigidity of the roof decking can also improve the price on most Romtec buildings. Comparing apples to apples, T&G decking typically has a higher cost than plywood or oriented strand board (OSB), but the increased strength of the material increases the allowable PSI for the roof. The added strength requires fewer truss supports for T&G decking. Using a smaller number of trusses saves on cost for both the materials and installation time.
The degrees to which these benefits apply are related to the material chosen for the T&G planks. Romtec typically uses Douglas fir or cedar planks, but there are a wide variety of additional wood types as well as composite materials that can be used. The reasons for choosing one wood type over another are typically a matter of customer preference. These reasons can include price, appearance, availability, or weather resistance.
Cedar plank T&G is a favorite for many customers because of the well-known weather resistant properties of the wood. It also has a very recognizable and attractive wood grain. Douglas fir has a lower initial cost and is comparable in terms of durability and appearance. Composite materials have a higher cost, but they do not decay and resist most any weather conditions. Composites can be made with many different appearances that can meet a wide range of preferences.
In addition to the material, T&G roof decking can offer different appearances with different styles of spanning. There is simple span layup, two-span continuous layup, controlled random layup, cantilevered mixed layup, and more. These terms describe the patterns used to organize the joints between the lengths of the planks in each row.
A simple layup aligns each plank joint with the spans between each rafter. The joints in each row line up at the rafter which effectively “hides” the joints from being seen in the building. Other layup patters make the joints visible with different aesthetics and structural advantages. A random layup means the joints will appear differently in each row of planking.
This versatility is what makes T&G roof decking such an ideal choice for our standard pre-engineered building models. It offers customers a good benchmark for quality, price, and appearance for their pre-engineered building. Romtec is always willing to improve a structural design when the customer asks, but providing high quality standards means you won’t have to.