what is the measurement of floor joints for loft conversion
Country: I'm planning a DIY loft conversion project. I plan to strengthen the (ceiling) joists by sistering with wooden joists. The ceiling joists are 4.5 by 1.5 whilst the floor joists in the house are 7 by 2 (actual measurements).From my knowledge of beams (joists), the stiffness varies with the width and the cube of the height.he ceiling joists are 4.5 by 1.5 whilst the floor joists in the house are 7 by 2 (actual measurements). From my knowledge of beams (joists), the stiffness varies with the width and the cube of the height.