STEP 3
Assemble Back Side Wall Frame
3.1 Using 1 1/2˝ x 1 1/2˝ pressure-treated lumber, construct back side wall frame using the drawing
below as a reference. You will need two boards cut to 1´-9 1/2˝ that will be studs, two boards cut to 1´
that will be the window header and rough sill and one board cut to 1´-9˝ that will be bottom plate.
3.2 Connect the beams with 2x3˝ wood screws.
3.3 Using a speed square or carpenter's square, check the corners to make sure they are 90°.
3˝
1´
3˝
1´-9˝