Laying 2x4s flat on concrete

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Harveyshot

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We are planning to build a deck out back but the patio slab is only 3-4 inches below the patio door threshold. Can treated 2x4s be laid flat on concrete to support the decking? There will also be posts for the deck cover. The slab drains away from the house and the deck won't be attached to the house. But we are hoping to extend the deck beyond the slab.

Will this work?

Thank you.
 

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