chrisrg
Member
Hi guys, I've been reading a bunch of posts here and I know how much you all love questions about decks, so I thought I'd throw out there for fun. I'm working on a deck/kids playhouse project. It's 14x8 total size, built on the side of a relatively steep slope. 6' off the ground at the bottom of the slope. I've been following the CDA6 guidelines, but the one thing that I'm second guessing myself about is my footings and the live load calculation. First I should mention that I live in Southern California and we don't have a frost line. My soil is mainly sandy clay. For my footings, I dug 28" diameter holes to approximately 36" depth. I drove rebar 2 feet into the hole bottom. I put 1 foot of concrete in the bottom and set 12" sonotubes in which are 36" in height so approx 1 foot of the sonotube is above ground. Holes were backfilled and compacted around the sonotubes. All of the concrete was poured at the same time, so it's one solid footing. 3 of the footings are supporting 6x6 posts. The 3 footings on the hill side have the beam sitting directly on the footing (no posts), attached with proper hardware. Beams are 4x6 hem-fir. Joists are 2x8x8, 16oc. Double rim joists. Joist hangers on both ends plus hurricane ties at both beam/joist junctions. I do know one item that I made a slight mistake on. The beams are 4x6 at 6'6" where they hit the post. I'm pretty sure that code says they can't be more than 6'. I thought they could be 7 ft. I'm going to be building a playhouse on top of this deck, approx 10x8 with roof, shingles etc. I have no idea what this house will weigh, but if it tops out at 2000 lbs I'd be very surprised. So if the dead and live loads combine to 3000 lbs / 112 sq ft of deck, that would equal 26.78 lbs /sq ft. All of the calculators have said it should be fine for 60 lb/ sqft, which means it should be able to handle 6720 lbs.By the way, my local codes require 18" deep footings x 18" square for the joist and beam spans I have. Even though I did round footings, I'm pretty sure I've well exceeded that requirement. I didn't pull permits for this project, not because I didn't think I could build it to code, but because this is the only location I could build this playhouse and it's closer to the property line than what's allowed. From everything I've mentioned here, does it sound like I've my footings properly to support the deck and structure I want to put on it? I think I'm ok, I'd just like to get a few expert opinions.
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