Floor Joist Supportfor Tile

We re putting down cement backer board and then ceramic tile.

Floor joist supportfor tile.

My question is should the tiles be placed so they are perpendicular with the floor joists or can they be laid parallel to the joists. Tile over wood subfloor. 3 cut out the joists under the area to be lowered. You must consider all of the weight the floor joists must be able to support.

Joists are spaced at regular intervals much like the studs in a wall frame. In extreme cases jim and rich have advised additional joists be put in place. 4 add a single 2x10 header between the doubled joists to carry the 1 stub joists from the beam. Plywood and osb are the two most common materials used for floor decking and typically they are 5 8 or 3 4 thick.

Hi a question regards setting out velux windows on a new extension roof basically do the velux s have to be spaced out so that the tiles fit as either a full or half tile to the edges of the velux. Planning on laying tile in our house. Now consider the same floor joist supporting stone tile flooring such that floor dead load is now 20 psf. Cut 1 5 extra on the beam side and 3 extra on the other side.

The floor framing for bathtubs requires special attention. Also when installing the joist supports you need to make sure that they are level. A standard bathtub can hold between 40 and 60 gallons of water. 2 temporarily support the 3 joists that pass under the shower pan area on either side of that area.

This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction. In this scenario jim and rich install 1 2 cementious backer unit cbu resulting in at least an 1 1 8 thick. So a 5 by 10 foot bathroom floor generally supports up to 2 000 pounds. The tiles are 7in x 20in.

If we use the same joist total deflection will be 1 50 1 25 0 25. This provides sufficient support for most cast iron bathtubs which run under 500 pounds even when full. Obviously to do this then the joists have to be placed to reflect this exact positioning. If the floor was built using the general 16 inch spacing you can expect a bathroom floor to safely hold 40 psf.

True floor joist span calculations can only be made by a structural engineer or contractor. However you should take a little extra time to double check to make sure that they are all level.