I am about to put a small deck at our back door. I have a 6 x 11 foot concrete pad outside the door. It is about 4 feet above the ground with 5 steps down. It is actually the roof of the basement access through Bilko doors. Is there an adhesive made to adhere the decking to the concrete? Such as liguid nails or something like it. The rest of the deck will be done the conventional way screwed to joists.