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Roofing and Cupola
 We used 4x8 oriented strand board sheets as roof sheathing. As you nail the sheathing panels, stagger the vertical seams between rows for added strength. H-clips also strengthen the horizontal seams between rows.
Install eave flashing under roofing felt and over the fascia. It provides a drip edge.
Staple or nail paper roofing felt (30lb) to the roof sheathing, overlapping it as you work upward. The felt acts as a vapor barrier and protects the sheathing. Round, tin roofing buttons can also be nailed down to hold the felt in place and prevent it from tearing over the staples/nailheads.
Rake flashing is nailed over the felt to deter wind and rain.
 We installed cedar shakes. As with asphalt shingles, put down a starter row and nail the first row over the starter, staggering the gaps.
Once that's done, nail down a ridge row of overlapped, bent shingles/shakes.
TIP: With the roof on and the walls sheathed and housewrapped, setting the windows and doors next will make work inside the garage more comfortable, especially if cold weather is a threat.
Cupola
 We installed a prefabricated cupola. Often used to vent barns, a cupola can also add some character to a garage's roof line.
Cut the bottom of the cupola to match the roof angle.
Make a base for the cupola to set over by screwing 2x4 blocks to the roof.
Our cupola was just decorative. If you want the cupola to vent the garage, cut a hole around the inside of the blocks. Doing this may require extra flashing at the roof where the cupola sets.
Fit the cupola over the blocks and screw/nail the bottom of the cupola to the blocks.
Housewrap
 Before you begin siding, consider installing housewrap. Housewrapping the garage prevents air and moisture infiltration.
If your garage is attached, heated or moisture is a problem, housewrap is a good idea. It also protects the sheathing until the siding is on.
When installing, overlap and tape the seams. Wrap over window and door frames by cutting the wrap diagonally, pulling it around the inside frame and stapling it in place.
Installing Lap Siding
 We selected wood lap siding for our garage. It's a simple style that matched the siding on the house.
Overlap each board about 11/4" and space nails about 1" above the board bottom. As you progress, install drip caps over the window and door openings.
Fit the top board by rip cutting it lengthwise if necessary.
Paint and Stain
To protect the siding from the elements, it's a good idea to stain/paint soon after the siding is installed.
In our case, we used an oil-based stain with water repellant properties to highlight the wood siding and trim.
On the trim and soffits a solid stain mixed to match the house color was applied. The siding was stained with a semi-transparent stain. The windows came already primed, so we gave them a coat of latex paint to match the trim.
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