Measure the length and width of the deck using a measuring tape. Multiply the two measurements to get the surface area requiring coverage. Order enough tiles to cover the deck plus an additional 10 percent to account for tile cutting and to retain replacement tiles.
Clean the deck surface, clearing any dirt or debris with a broom and then washing the deck down with a pressure washer. Allow the deck to dry before applying the tiles.
Install the deck tiles beginning at the wall edge of the deck and working your way towards the deck edge. Leave a ¼-inch gap between the wall and the first tile to allow for movement of the tiled surface with temperature changes. Line the tiles so that the flat edge of the tile aligns with the wall, with the tabbed edge facing away from the wall. Connect the tiles using the interlocking tabs on the tile edges. Tap the tiles with a rubber headed mallet along the joints to firmly attach the tiles.
Cut any partial tiles needed at the edge of the deck with a jigsaw. Measure the space remaining between the edge of the final full tile in a row and the edge of the deck. Mark the measured size onto a tile using a marker along a carpenter's square to keep the line straight. Cut along the marked line and place the tile against the fill row using the interlocking tabs.
Use a reducing strip along the edge of the tile surface rather than partial tiles to create a smooth end piece for the tiles. Measure the length of the edge of the tile surface and cut the reducing strip to match the length. Connect the strip to the edge of the tiles using the interlocking tabs.
Fill the gap between the tiles and the wall with caulking to create a flexible waterproof surface. Place a bead of the caulk at the outside edge of the tile surface as well between the edge of the partial tiles and the deck or between the edge of the reducing strip and the deck. Allow the caulk to dry for 48 hours before using the surface.