When we decided to get more storage space in our attic we got 3 quotes, Cornerstone were a bit more expensive than the others but offered a much better system than the other two. Later on we found out that the other two quotes we had were only putting chipboard on to our ceiling joists where Cornerstone built a heavy duty floor inside our roof space resting on the walls not on the ceiling beams, Thank you Cornerstone for a great job,