|On Sat, 6 Jan 2007 02:16:39 +0800 Lisa Bates wrote : |> If we raised the floor by 20cms this would hide all pipes. |> (The existing floor is joists and floorboards. The old bath |> suite had a cast iron bath, so can take weight.) |> |> How do we do this? | |The easiest way will be to fix some bearers, say 50x75, across the |existing joists (i.e following the line of the floorboards) at |900-1200c/s and then 50x100 joists above them at right angles. You |can then run pipes under the floor in either direction without |notching. Finish with moisture resisting chipboard or ply. | |If you need to lose a WC branch within the floor adjust the sizes |accordingly.
But remember that there are limits to the height of a step you can have. Can't remember offhand if 8 inches is within the limit, but I think it must be as my domestic steps are 8 inches, but check when you have full drawings/details of the step. Also you must leave a certain height of ceiling.