In what direction should decking boards be placed (horizontal / vertical) compared to the deck? The boards are usually placed horizontally perpendicular to the adjacent wall. This choice is above all aesthetic, but it also important to be sure that the direction of the boards does not hinder water drainage.Click to see full answer. In this manner, does it matter which way you lay decking boards?A board that is correctly installed right side up (or bark side down) will form a crown and allow water to run off the edges. If the board is installed wrong side up (or bark side up) it will curve up on the edges when dry and water can gather and sit in the cup. That is a recipe for wood rot and problems.Likewise, which way should porch decking run? The main thing is that the boards run perpendicular to the joists, either at 90 or 45 degrees. Your situation is one of aesthetics and is your preference. Your real issue will be with the joists. Thereof, should decking be ribbed side down? However, every decking timber manufacturer will tell you: the proper way to install a board is ridge side down. The ridges, they say, were designed to let air circulate underneath the boards. This, according to them, prevents the buildup of moisture and, consequently, of mould.Should deck boards be parallel or perpendicular to House?Well, normally girders are parallel to the house, the joists are perpendicular and the deck boards are parallel. This is because the ledger acts as the a girder against the house supporting the joists. If you run the deck boards perpendicular to the house, then the joists need to be parallel.

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