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Step 6. The Roof Sheathing
Cover the roof area with 12mm (1/2") plywood. You will need four sheets cut at 1500mm x 1200mm (4ft x 5ft), two each side of the roof.
Make the plywood flush with the top of the ridge, the outside edge of the side walls and the outside edge of the front and rear walls. Nail a maximum of 200 (8") apart along the ridge blocking [n], the rafters [z], the raking top plates [l] and the side wall top plates [g].

Ensure that the middle join is on a rafter. Use 50mm (2") galvanized nails.

NOTE: If using plywood sheet off-cuts it will be necessary to add blocking between the rafters where any joins occur.

Step 7. The Wrap and Roof Boards
Cover the shed frame in building wrap or builders felt. Make the wrap taut and waterproof and hold in place with staples or small flathead nails.

Cut 16 lengths of 250x25 (1x10) roof boards [v] at 2400mm (8ft) long.

Start on one side. Have the first (lower) board overhang the side wall by half of its width and nail it in place. See fig.2.

Work upwards overlapping each board by 50mm (2"). Nail thru the boards where they overlap at points along the lines of the rafters [z] and raking top plates [l] using 90mm (3 1/2") galvanized nails. See fig.2.

Do the same on the other side of the roof.

Step 8. The Vertical Boards
Fix the 250x25 (1x10) vertical boards [r] to the wall frames beginning at the corners.

On the side walls cut the vertical boards at a length long enough to tuck under the lower overhanging roof board [v] and run below the floor joists.

On the font and rear walls cut the vertical boards at a length long enough to be flush with the top of the raking roof and run below the floor joists. The tops of the boards will need to be cut on a 45° angle to match the rake of the roof.

Nail all vertical boards [r] to the horizontal blocking [k] with nails spaced approximately 75mm (3") apart including the nail that will be going thru the batten. Leave a gap about the width of a nail shank between each board.

Step 9. The Trims, Flashing and Battens
Cap the top roof boards with a piece of L-shaped galvanized flashing [w] running the length of the ridge. Ideally the ridge flashing should be wide enough to cover at least 100mm (4") along each plane (side) of the roof. (See fig.2)

Cut 4 lengths of 150x25 (1x6) rake board [x] at 1800mm (6ft) long.

Make a 45° angle cut at one end and make a round cut at the other end on all 4 boards.

Fix the rake boards [x] to the tops of the vertical boards [r] at both front and rear gables. Ensure the top edges of the rake boards are flush with the top of the roof boards [v].

Add the 100x25 (1x4) rake cap [y]. Miter the top end of each length of rake cap at a 45° angle. The rake cap sits on top of the rake board [x] and covers the ends of the roof boards [v].

Fix the 75x25 (1x3) vertical battens [s] over each vertical board join. Preferably, the battens should have a groove each side of the join to stop water being drawn in by capillary action.

Nail on the center line of the vertical batten, thru the gap between the vertical boards and into the blocking. Overlap battens at corners using 75x25 (1x3) batten on one side of each corner and 100x25 (1x4) trim on the other side.

Using one length of 100x25 (1x4) stock and one length of 75x25 (1x3) stock at each corner will give a balanced look. (see fig.3).