What size floor and ceiling joists?

johneym

Hello Folks,

I am renovating an old bungalow and will be putting in floor joists on the ground floor. The height I need is 4" but what thickness is best and what distance centers? They will be laid on a solid concrete floor.

Its the old style high ceiling and I will be putting in a lowered ceiling at 8' foot height. The ceiling joists will be attached to the external walls. Again, whats the best width and thickness to use? In one section of the attic I will be making storage space as there is enough head height, so the joists there need to support this.

Many Thanks,

John

monseiur

For the floor joists 4x2 should do spaced at 16'' ensure that the timber has some ventilation, consider using pressure treated timber to avoid dry rot etc.
For the ceiling joists 6x2 should do with a line of struts in the centre, you can use joist hangers on both wall.
For the attic space considering that it's a load bearing ceiling/floor use 7x2 with 3x2 runners rawl bolted on both walls plus 2 rows of struts (depending on the width of room etc.

M.

eamon11

good advice above.

johneym

thanks for the helpful response monseiur. Much appreciated.