The practice of stacking gypsum board on wood floors prior to the installation is common and necessary to the successful completion of any residential project. Because of the enormous weight, caution should be used in the placement location and size. The following guidelines are recommended by Boise Cascade EWP Engineering:
• Gypsum board shall be stacked no higher than 11 inches (22 sheet limit for 1/2” gypsum board, 17 sheet limit for 5/8” gypsum board).
• Placement of gypsum board stacks in the middle of a room is not allowed. Loading in the middle of the joist span induces greater deflections compared to loads placed near the joist’s supports.
• No more than one gypsum board stack shall be placed on a single joist.
• Gypsum board stacks shall be oriented with their long dimension perpendicular to the joist layout direction. In this orientation, more joists are supporting the wallboard.
• The floor shall not be loaded with gypsum board for a period longer than 4 weeks.
• Avoid allowing the joists or floor sheathing to get wet while loaded. Wet wood will take a permanent set, which may be unsightly and difficult to finish.
If a floor framed with Boise Cascade products has been loaded with gypsum board that has exceeded any of the aforementioned limits, please contact Boise Cascade EWP Engineering for further information.