Plans Double Decker Garage Storage Shelves – Step 3 Complete Assembling the Shelf Install the plywood top, bottom shelf and the 1×2 and 1×3 lips. Use construction adhesive for added strength. Step 4 Click Here to Discover the Single Most Important Issue that is Hurting the Quality and Enjoyment of your Woodworking Projects Right Now... ← Double Decker Garage Storage Shelves – Step 2 Double Decker Garage Storage Shelves – Step 4 →