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Step-by-step build — 8 steps. Also available as a print sheet.
Cut and build the front framing from the 2x4s with 2-1/2" screws, spacing the inner studs to match your insert's rough opening.
Check the frame for square by comparing diagonal measurements. Cover the front with shiplap using glue and 1-1/4" brad nails, centering the insert opening on a horizontal joint, then cut out the opening for your insert.
Attach the 1x12 sides with glue and 1-1/4" brad nails, adding screws if needed for extra security.
Add the 2x4 back framing with screws. These boards can be used to attach the stand to the wall for a fixed install.
Measure and cut the top to fit, attaching with glue and 1-1/4" brad nails, with screws for extra security if needed.
Measure and cut the side trim, front trim, and front corner trim. Attach with glue and brad nails, adding screws to the front trim if needed.
Sand all surfaces and apply primer and paint, or stain and poly.
Follow the manufacturer's instructions to install the fireplace insert.