Installation Guide

48" x 96"

48" x 48"

31" x 96"

31" x 48"

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Step 30 Install Roof Sheathing & Soffit Boxes

1. Install 5/8" plywood roof sheathing as shown below. Install the roof sheathing starting in

the center of the rafters. Insert plyclips between rafters; see Step 31 for detail. The roof

sheathing will extend approximately 1-1/4" past the sheathing on the dormer ends. Use 7d

coated sinker nails spaced 6" apart. Extend the sheathing 3/8" below the end of the rafter.

Tip: Use a piece of primed siding as a gauge. The top row of roof sheathing will be about

1-1/2" below the ridge to allow for ventilation.

2. Repeat on back of building to install roof sheathing.

3. Use a soffit gauge block and a straight edge to set the

location of the soffit box. Use the straight edge to

align the top of the 2x4 block flush with the top of the

2x6 rafter. Draw a line across the siding to set the

pre-built soffit boxes.

4. Install a 73" long pre-built soffit box on the front wall,

flush with the siding on the roof gable (3/8" beyond

the end wall corner trim. Screw the soffit box to the

wall with 2-1/2" long screws anchoring into the wall

studs behind.

5. Install (2) two more 73" long soffit

boxes and (1) one 72" soffit box. Screw

soffit boxes together with a 2-1/2"

screw.

6. Cut a 96" long 1x4 trim boards to

length and install as corner trim on the

lower wall using 8d galvanized box

nails.

7. Repeat steps to install soffit boxes and

trim on the back wall.

3/8"

1x4 Corner Trim

Optional ridge vent provides

ideal ventilation.

Air

Space

Rafter

Shingles

straig

ht edge