Draw a plan. Mistakes on paper cost less to fix than mistakes made during the renovation.
List the job priorities and tackle renovations in a systematic manner. For instance, fix the leaky roof before you refinish the floor.
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Hook up electrical lines early in the renovation process so you can run power tools on site.
Frame the room. Two-by-four framing is adequate since the barn's post and beam structure will be holding the weight.
Replace windows. Wood-framed windows will be in keeping with the barn's rustic style.
Build stairs. Access to the hay loft can be through the interior of the barn or via the exterior. If the hay loft room is the only area of the barn that you are renovating, consider exterior stairs.
Insulate and finish the ceiling. Install foam core sheeting to vent moisture before installing regular insulation. Finish the ceiling with gypsum wallboard or with tongue and groove lumber.
Insulate the room. If you plan to leave the interior rustic, sheathe the exterior with insulated panels.
Refinish the hay loft floor. This is where much of the wear and tear of the hay loft has occurred, so it may take the most work to repair. Consider insulating the floor from below.
Install light fixtures. Arts and Crafts or rustic-looking lights will be in keeping with the barn's style.