Whether you're a professional or a DIY enthusiast, it's important to choose the right size nail gun for your fence pickets. Bolt diameter None indicates full cross-section. All that said, I can not guarantee that my deck, on the side 12' from the house, does not float up and down a tad. on General Board, Started by woodsy How Much Weight Can a Wall Hold . 3 Trusses made with 6x6 overall size is 12x12 4.5 pitch, 2x6 T&G decking , 8x8 columns, 8x8 carrying beam to span 12' center to center at columns read more. You are looking at a pretty massive beam to carry any 20' span. We have not been in the house long. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! myimages[5]="../../../images/top-banner/cookie-mizer.jpg" Forum Responses //-->,