Module 8a + b

Gather materials for Mod. 8a+b

6: 2x4x12'

2: 1/2"x4'x8' Plywood

2: 3/4"x4'x8' OSB

~100: 3-1/8" construction screw

~100: 1-5/8" coated deck screw

Cut all framing members for Module 8a

2: 2"x4"x3'4-7/8" (horizontal top and bottom members)

4: 2"x4"x5'5/8" (vertical members)

Assemble

Verticals go inside of horizontals, one on each edge, one at a distance of 2.5" from the left-most vertical, and one 1'2-1/2" from the right-most vertical. This layout should result in a 1'5-7/8" gap between the inner-most verticals.

Use 3-1/8" screws to attach all framing. Screw through horizontals into end grain of verticals (2 screws per joint)

Exterior Sheathing for Module 8a

Measure and mark 5'11-1/8" up one side of the OSB and over 3'10-1/2". Cut the module's exterior sheathing using a 7-1/4" circular saw.

Place the frame on the ground or on a table with the narrow gap between studs on the right. Place the OSB sheathing onto the frame so that it overhangs 6" along the bottom and 5" along the left side. This should result in a 1.5" overhang at the top and a 5/8" overhang on the right side.

Fasten the 3/4" OSB to the framing using 1-5/8" coated deck screws around the perimeter and interior studs @ approximately 16" spacing.

Insert R13 fiberglass insulation batts

Cut insulation strips a little over-size so it will hold itself in place, and install them into the stud cavities with the paper faced side closest to the interior.

Interior sheathing for module 8a

Measure and mark 5'5-1/8" up one side of the plywood and over 3'5-7/8". Cut the module's interior sheathing using a 7-1/4" circular saw.

Place the frame/osb/insulation assembly osb-side down. Align the plywood sheathing with a 5" overhang on the right (edge furthest from narrow stud-gap) and flush with the bottom plate. The offset should line the left edge to sit flush with the 2nd stud from left-most. The top overhang should be 1.5".

Fasten the 1/2" plywood to the framing using 1-5/8" coated deck screws around the perimeter and interior studs @ approximately 16" spacing.

Fabricate Module 8b

Module 8b is a mirror image of Module 8a.

To make 8b, follow same directions for building the framing for module 8a. Then apply the exterior sheathing so that it overhangs like in step 3

Module 8b is similar to 8a

Cut the same framing elements and assemble (same dimensions, assemble identically to 8a)

Cut the sheathing exactly the same

When attaching sheathing, place frame on the floor with the narrow stud-gap on the left. Attach OSB with a 6" overhang along the bottom and a 5" overhang off the right edge.

Flip over, fill with insulation and attach plywood such that the bottom edge (side with 6" osb overhang) and inner stud at narrow stud-gap are flush with plywood edges.