For an 8 foot by 30 tabletop made of 3/4" plywood, how much weight should it be able to hold, with a square steel tube frame underneath (1 1/2" 16 gauge)? I'm building a custom computer desk. I'm torn whether to stick to my original plan of doubling up the plywood, or save a bit of money on supplies and just stick with 3/4". Specifications and Mill Capabilities We manufacture plywood products to various grades, dimensions and performance standards appropriate for a wide range of customer end-uses. We use mainly inland Douglas fir and Western larch due to their ability to produce fine grain and smooth faces. 3/4 inch 4 ftx8 ft Standard Spruce Plywood Why Plywood? Simply because it outperforms all substitute wood-based panels on the market today. Plywood is a highly stable panel. When exposed to moisture or high humidity, plywood is up to seven times more resistant to thickness swell than substitute wood-based panels. A standard sheet of OSB is 4 feet by 8 feet. OSB is structurally similar to plywood, varying mainly in the manufacturing process. OSB is manufactured using rectangular wood strands arranged in cross-oriented layers. Plywood is made using thin sheets of veneer that are glued together, with each layer positioned perpendicular to the adjacent layer. plywood in single or multilayer floor systems, while Section 3 provides similar information for plywood used as wall and roof sheathing. Section 4 provides information on various performance issues concerning plywood. The information provided in this guide is based on standard industry practice. Browse our range of trade standard plywood boards such asStructural Hardwood Plywood, Shuttering Plywood or Selex Structural Plywood. Click and Collect in 1 hour or enjoy free UK delivery on orders over %pound;50 excl. VAT.