Building a Deck, Day 3 – Mapping Out The Foundation Piers
DAY 3 - Mapping Out The Foundation Piers
Luckily, you don't need an engineers degree to layout the foundation piers for your deck, but you might need at least a little help from outsides sources (aforementioned books or the internet) to determine their position. Here's what I've gathered so far:
- The easiest option for post placement is at the extents of your deck. If posts are on the corners and along the edges, you'll only need one set of measurements to determine the outside edges (rim joists) of your deck and where the posts will fall. This will create a more boxy-effect when the deck is complete.
- I don't like to do things the easy way (it bites me every time...)
- You can set your posts back from the edge of your deck to create a cantilevered area over the posts, both front to back and side to side. This requires two sets of measurements however as you need to find the edges of the deck and then determine how far in the posts will fall from that edge. This will create a more floating-effect when the deck is complete.
- The maximum overhang for a beam to cantilever past a post is 12". This is what my beam will be doing.
- The maximum amount of cantilevered distance you can have for the joists that overhang the beam is roughly 40% (unless you're Frank Llyod Wright, or one of his students). To be even more safe and to allow squeamish in-laws to use the deck, make the overhang no more than about 24-36", regardless of framing lumber used, to prevent a bouncy feeling when standing near the railing.
With all of that in mind, I decided on 4x4's for my posts and 2x10's for my joists (all Pressure Treated Pine - PTP). My beams will be built-up beams of 2-2x10's sandwiching 1/2" treated plywood. The total width of the built-up beam will be 3-1/2", the same width as my 4x4's. I wanted to do the deck in cedar, and most likely still will use cedar decking, however PTP has is stiffer and stronger than cedar, although it "moves" more as it ages, so I can create longer spans and use fewer post (less digging, less cement - something you can appreciate if you've ever done either before). Since this will be a built-up beam, that means I'll be mounting it on top of my posts, rather than bolting it to my posts. This seems to be the safest option as you're not relying on the aging ability of your posts, as you would be if you drilled holes through them for carriage bolts to bolt your beam to your posts. Drilling those holes slightly weakens the wood, increasing the chance for cracking or checking. I'm not saying that doing it that way isn't safe, it is. There's just a greater potential for future problems. For lower decks, it's actually a necessity as there may not be enough room to have a beam mounted on a post and joists mounted on top of that.
As you can see in the chart above, the maximum distance I can have between my posts is 9 feet. I am using a built-up beam, which is 3x10, and my joists are 11 feet total in length, however the beam sits at 9 feet with 2 feet cantilevered (so the greater of the two supported lengths is 7 feet - 9 divided by 2 - beam one one side ledger on the other - is 4 1/2, plus my cantilever - 2 feet, is 6 1/2 feet, rounded up to 7 feet). Confusing? It really isn't, but as I type I realize how hard it is to explain in font rather than a diagram.
Building a Deck, Day 2 – Deck Plans
DAY 2 - Deck Plans
I should probably divulge my deck plan before going much further. Unfortunately, I sit only at about 50% as this was going to be a two-level deck, the upper level being rather small and the lower level sprawling. Arguments between whether the pergola we eventually want to also include will be part of the deck, or completely separate in our backyard has delayed the lower level from taking a true form. Once the top level is done, we'll revisit the lower.
Now, I've tried a variety of drafting options to design this deck. Online design programs, home design programs (left over from when we built), misc programs that friends and family have discovered, but none of them could really do what I wanted. I can say this, if you're looking to build just a simple deck, without any thrills, those programs, and even the ones you find in those kiosks in home improvement stores, will probably do you just fine (the one thing I did notice from all of them though is that they overbuild - not the worst option in the world). If you want complicated angles to your deck, multiple levels that wrap around a bumped-out area of your house, or fancy carpentry to really make the deck pop, these programs may leave you feeling empty. My advice, if you're semi-creative, just grab some graph paper, a pencil with a hefty eraser, and a ruler, and go to town.
Initial Concepts
Further Concepts (notice I've abandoned the computer for graph paper)
Top Level Only (what this whole series is about)
Building a Deck, Day 1 – Resources
DAY 1 - Resources
Now, I am not a carpenter, but I do have some decent carpentry skills. I own more than my fair share of tools (don't you always need a new tool for every job?) and I worked on a variety of wood projects: a table saw, bandsaw, compound miter saw (which I have actually used the compound part of and I must say, crown molding, never again), more drills that you can shake a stick at, a drill press, an air compressor with I forget how many tools, orbital sanders, belt sanders, the list goes on...This project, however, will definitely be the largest (before this, my largest project may have been a coffee table that housed 2 10" subs for my entertainment center - gotta love those college days).
Before we started this huge project, we picked up a few books (*gasp* paper!) that I have found extremely helpful, all bought used from Amazon.com (why spend the money on new books when there's a good chance the book is going to get damaged along the way - or highlighted, or sticky-noted like mad). We had done a ridiculous amount of research online, looking for pictures of other people's decks, different construction methods, etc, but nothing beats being able to lay on the couch thumbing through a book, slapping sticky notes left and right for things you'll need to remember later. Don't get me wrong, you could probably find all of the same information online, and I'm sure that I did, but bookmarking 47 websites that contain snippets of the info I need is not my idea of organization, especially when the sites you visit start to contradict each other for what is acceptable. I digress... onto the books:
Build Like a Pro : Building a Deck
The best book of the 3. Lots of "Pro Tips" tucked away in the side columns to let you know of things to do or watch for. My bible in this deck building project.
Home Dept Decks 1-2-3
An OK book, but has less information than the Build Like a Pro book. It does fill in the gaps in a few areas however, like what to do when the top tread of your stairs is going to fall midway against your joist. The above book only takes into account that the top tread will start at the same height as your deck.
Ortho Start-To-Finish Decks
Not really start-to-finish. Lots of good examples and ideas, but no "You like this? Here's how you do it" information.
Building a Deck, Day 0 – The Permit
DAY 0 - The Permit
We took it upon ourselves to build a deck this year. Not an easy feat. The planning alone has taken months. Who would have thought that you would practically need an engineer's degree to figure out how to build it so that it won't collapse under its own weight, let alone tear the wall of your house off from its foundation?
We live in a cold climate. Mother nature is a nasty mean woman, who's frigid winters are even tougher than her summer heat (-20°F winters, 90°F summers and humid). Strangely enough, there is a very lax building code for our area when it comes to non-habitable structures (decks, outbuildings, etc). I gave the inspector a call to ask about the permits that I'll need to start this deck project and quiz him on a few other key questions.
Me: "So, how deep do I have to go with the deck piers?"
Inspector: "Try to get them below the frost line."
"So, 4 ft should be good. Do you need to come out and check them before I build."
"Nope, that'll be plenty good."
"Do I need to reinforce the poured concrete with rebar or anything?"
"Nope."
"When do you come out for an inspection?"
"When it's done."
"So, you don't need to check anything along the way?"
"No, I'll mainly just come out to make sure that it's stable."
"Wait a sec, you're telling me that you don't need to verify anything after I file for the permit until the job is complete?"
"Yes."
(thinking, What exactly am I paying for a permit for then?)
"I've been told by the township that the permit is good for a year. How much is the permit again?"
"Yes, $25."
"Ah, look for my check in the mail."