Published on October 9th, 2012 | by Henri


Composite decking on patio

Q. We have a concrete patio on two courses of blocks at the rear of our house. Twice now, we have tried outdoor carpeting. It gets only the morning sun. After it rains, it stays damp (like a sponge) for long periods which causes green mold to form on it. I am thinking of installing composite decking on top of the slab. The patio does have a one-inch slope. I would first install 2×4’s, spaced out for drainage. Then the decking material. Good idea or bad? Any other suggestions?

A. It is a good idea.

I assume that there is enough space between the door to the patio and the patio itself to accommodate the new construction. Select and use very straight pressure-treated 2-inch by 4-inch sleepers and fasten them to the concrete (after a thorough cleaning of the slab) with construction adhesive. Follow instructions to allow firm setting of the sleepers onto the concrete before fastening the decking.

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