Deck beam size

Old 08-08-22, 05:22 PM
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Deck beam size

We are going to build a 16x20 deck attached to a ledger on our house. First posts will be 8 ft from the house on the outer sides . I want to install a steel C channel beam or double c channel to maximize living area underneath the deck. Can anybody help me with what size channel to go with that spans 20'? Thanks!

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