the answer to your question about the header is this,your house uses more than likely a sill plate.or a 2x8 laying flat on top of your footing/foundation.the actual weight of the structure above that point is totally supported there. the nails in your floor joist ends simply keep them upright and are NOT load bearing.by looking at that you can understand how end nailing a board into a center beam would make the nails the load bearing members.( this is what makes your deck move by the way)by putting a beam UNDER your full length joists IT becomes the supporting member.to put a double plate down the center would again require a sill plate of some type to hold the joist ends with posts under it,or nails would become supporting again,or more simply put it would be like cutting your deck in two lenghth wise and wiring it together with baling wire.think of it this way,by putting a header down the middle like you want to unsupported in any way ,you are building basically two decks,one at the house,one at the outside posts.without any support in the center both are simply cantelivered off thier supports and stepping in the center is like having a seven foot long nail puller.much better to use lumber full length of the width of your deck because its supported on each end. bottom line,always build so nails/fasteners are not load bearing in any way.if you have any doubt about a 2x6 spanning 14' simply go with 2x8.in fact according to my handy dandy pocket reference guide,to get the support needed for a fourteen foot span you will have to use 2x8 ,16" oc,and thats with a live load of only 30lb per foot with it being fully sheathed with flooring on top.IF you were strictly going by the book of course.if your planning to use 2x6 it would have to be center supported. live load =movable loads such as furniture,wind ,snow etc.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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