We recommend that your base should be no smaller than the minimum base size listed below and no more than a few inches larger.
The first dimension listed is the external width (A) and the second dimension is the external length (B). The width refers to the angled gable wall.
8'5" x 12'7" GREENHOUSE = minimum base size 2570mm wide x 3830mm long (8'5" x 12'7")
8'5" x 14'7" GREENHOUSE = minimum base size 2570mm wide x 4450mm long (8'5" x 14'7")