Pergolas in Milford, OH

Milford (ZIP 45150) lots generally shed in one direction, so where surface water finishes up is a question most of these properties have already answered. An open pergola does not change that answer at all. Something that closes changes it completely.

Rafters on edge intercept almost nothing. Rain passes between them and lands where it always did, which is why a fixed pergola never needs a gutter and never appears in a drainage conversation. Add a retractable canopy or a set of louvered blades and the structure becomes a roof. Every square foot it covers now sheds, and on a closed louvered roof all of it arrives along one edge in a line.

That line is a decision and it is much better made early. A twelve by sixteen structure closing over a deck delivers its whole plan area to one side, and the side it is on decides whether that water runs away down the fall of the lot or back toward the house, into the corner the deck already drains to, or onto the one path people use. Louvered systems carry the water inside the beams to a downspout at a post, which is the tidy answer, and where that post stands is part of the same decision.

So even on a fixed pergola we ask whether anything that closes is ever likely. If the answer is possibly, the structure gets set out with a fall in one direction and a post positioned where a downspout could go, which costs nothing now. Retrofitting a slope and a drainage point to a structure built dead level is the version that costs money.