TimberTech AZEK Deck and TimberTech AZEK Porch are made of the same high-performance material, but the difference comes in their application and installation. Installing a porch versus a deck is also different with the porch installation requiring the joists to pitch away from the house at 1/4″ per foot. TimberTech AZEK Porch boards are secured by a tongue and groove installation. They are available in 10′, 12′ and 16′ lengths. TimberTech AZEK Deck boards, available with square edges or grooved edges and are available in 12’, 16’, or 20’lengths.