Determine installation location: Measure door frame width for interior placement; add 3 inches on each side for exterior installation.

Tri-fold method for sizing:

• Example: 10-foot-wide dam → center section = 61 inches, side sections = 30 inches each.

• Side sections fold for compact storage.

Rain guard support beam:

• Matches dam width, divided into three sections.

• Center piece = 1 inch longer than outer boards for proper closure.

Mounting hole placement:

• Drill holes 1.5 inches from the edge.

• Space holes 4 inches from the top and bottom.