Have a walk up attic, plenty of space to roam. When the house was built they fitted the plumbing through the attic floor so all we have to do is tied it into the boiler in the basement and plumb it in the attic (adding heating elements, etc.). We will be building knee walls, just not sure if we should build it over where the pipes come through the floor or bring the wall further away. I think it should come out of the floor and pipe should lead about 1-2 feet further away from wall, allowing an adequate crawl space. Any thoughts?