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Wednesday, April 29, 2015

DIY Carport...

Built a lean-to carport to protect Pillions newish Subaru after a couple of hailstorm scares. Here are the steps simplified, for inquiring minds:

1st step was to bolt the 2x8x10 ledger boards to the existing shed, using galvanized hardware.
The ledger board is where the top of the joists will attach to the shed.

Posts for the header were set 2 feet deep in gravel, square to the existing shed and 10.5 ft out.
The pencil line marks the point of level across all three posts as the grade falls from post 1 to post 3.
You can see the ref line a bit higher on the 2nd post in the bkgd

With 4x4 posts already set and notched, the 2x8 header that the joists will rest on is attached with galv. bolts.
The notch allows the weight of the header to rest completely on the post, rather than the attaching hardware

With the header and posts complete, the 2x6x12 joists can be run from the ledger board to the header.
I allowed for a 2 foot drop over 12 feet to shed snow/rain
Detail of the joist hangar used to attach this end of the joists to the ledger
Different hardware is used to attach the other end to the header
Here's the other end of the joist attached at the header.
These photos were mostly made after most of the build was completed, so here you also see
the purlins and the tin have been attached.
Heres a good detail showing the header, posts, notches, bracing, purlins and facia board and tin all tied together
Overhang will help protect all this from weather.
After the ledger, posts, header and joists are all attached, the purlins can be run perpendicular to the joists
The joists were spaced 24" on center, and so are the purlins in the opposite direction
The 1x4 purlins are what the tin roofing sheets will attach to.
Galvanized, shielded and gasketed screws are used to attach the roof
to the purlins. Screws are applied thru the "v" of the 5-v sheets to
reduce leakage in heavy rains. I almost got the lines straight.
I overlapped the tin sheets so that the laps all face east, as most storms come from the southwest.
The helps not give strong winds a leading edge to pry up the tin in a bad storm.

I installed a drip edge all around to help keep water from creeping back in over the woodwork
Bracing keeps the structure from racking back and forth during storms.
I mounted these flush in case I come back with an enclosed wall later.
Still need to add gravel for the floor, but testing the fit with my truck before rolling Pillions Subaru in here
Here's another view of the completed structure.