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I am contemplating a freestanding deck on my new home. It will probably be 16’x30′, and about 8′-9′ off the ground. My builder typically makes all their decks freestanding, but I have declined the deck from the contract for money and quality purposes. I asked about going ahead and having him install a ledger board during construction to save disruption to the siding (vinyl), but he stated they build all their decks this way. I am assuming it is mainly to eliminate callbacks due to bad flashing and rotten sillplates and ribbon boards, but it may also be due to their use of TGI. Any thoughts on the stability of a freestander of this height and size? Can it be accomplished with a multitude of 6×6 posts and extra bracing?
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Eric, sure it's possible, but you'll need help from an experience builder or structural engineer to design it. Decks have to be designed for more weight than the inside of the house, and 8 or 9 feet is pretty high. You don't want to have a deck-warming party and watch 20 of your closest friends ride your deck as it corkscrews to the ground, do you?
*Mike: assuming I have close friends, you are correct in that fear. I am certain that due to our juristiction's code requirements, we will need permits and inspections, so design will need to be right the first time. I am looking for advice about structural design, so that I can minimize reworking plans. I am certainly not wed to a freestanding design - actually I am a bit suspect.
*eric.. if it's 8'-9' off the ground it sounds like it will be over a walk-out portion of the foundation...which puts a lot of posts alongside the found....can they be located conveniently to any openings ?will your deck surface be flush with the first floor or dropped 6" or so ?
*Eric- Unless you like looking at alot of posts and diagonal bracing,I would attach the deck to the house.Either way it will require two beam runs and at least 6 posts.4x12 beams and 2x12 joists.I'm curious- how do you decline a second story deck for money and quality purposes on a new home?Isn't the builder required to to have that structure built before you take occupancy of the home?Doesn't the building inspector have to pass some outdoor structure from your back door so you don't get killed taking that first step?Just curious?Bob
*If you are otherwise happy with the builder, do it the way he wants. A free standing deck is certainly possible. Though most of us don't usually do it that way, he may have found a system which works for him. We all have found ways to reach a final goal, often through long trial and error. It could be that this builder has seen a lot of water penetration problems in the past and uses the free standing deck because of this. A lot of construction techniques are habit and this is not a bad thing. It allows for crew efficiency and lets us concentrate on the tricky parts of the job. Each builder has his own set of habits which work for him. Of course, if your builder is simply no good, you are screwed, free standing or not.
*I am assuming that as long as they attach a barricade, it will pass inspection. In the contract negotiation phase, we identified features that could be eliminated (for me to complete at a later date) that didn't interfere with critical path construction. I am also assuming that most after-market deck work will be superior to that of a house builder. The standard deck from this builder was 10x14 - much too small for what we were wanting to do. The more I think about it, this design alternative just isn't sounding too good. Too many concessions, plus it sounds like I will have a "post farm" underneath. Eric
*Eric- I would let the buider go ahead and build the deck. The quality or size may not be what you want right now but you can always step down to a lower,larger, and nicer deck later. The credit for the builders deck couldn't be that much and you would at least have a place to put your BBQ till your future expansion.Bob
*Judging by Pro-Dek's posts in the gallery, I suggest having the buider put the ledger on w/ proper flashing, make sure he does that right and cover Pro-Dek's airfare. In the long run I believe the free standing deck will be a problem and or be the post farm you described. The TJI's aren't even an issue.