Hip Boards and Base Boards for Hoop Houses
Hip boards and Baseboards connect the hoops and keep them even along the length of the structure. When straightening out the hoops I like to do the base and then the hip. They also act as a foundation to secure lock channels and spring wire, which is by far the best way to secure greenhouse plastic.
Most kits that call for wood have you source the lumber locally so add that cost into your budget. Baseboards tend to be 2x6’s. Hip boards are sometimes 1x6’s or 1x8’s. I personally like the strength and width of a 2x6, but this is another personal preference type of thing.
Remember, it's ok to over-build, just never cut corners or under build.
Metal hip and baseboard options do come with premium kits. These metal braces offer multiple connection points on the hoops to help with wind bracing. They also will out last wood long term. And as far as strength, more often than not will also be superior to wood.
When comparing kits, note the gauge and profile of the metal bracing. This is another place where there is no “industry standard”. There are so many options out there. This may be a place manufacturers use to lower the cost of a kit with lighter gauge steel. And remember, the lower the number, the thicker the metal.