Floor Joist Supportfor Tile

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

Floor joist supportfor tile.

Tile over wood subfloor. In this scenario jim and rich install 1 2 cementious backer unit cbu resulting in at least an 1 1 8 thick. 3 cut out the joists under the area to be lowered. A standard bathtub can hold between 40 and 60 gallons of water.

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. Plywood and osb are the two most common materials used for floor decking and typically they are 5 8 or 3 4 thick. In extreme cases jim and rich have advised additional joists be put in place. Cut 1 5 extra on the beam side and 3 extra on the other side.

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. Obviously to do this then the joists have to be placed to reflect this exact positioning. The tiles are 7in x 20in. They are covered with subflooring panels of plywood or oriented strandboard osb to complete the floor s structural assembly and create the solid continuous platform on which you install tile carpet or other finish flooring.

Attach joists using joist hangers the project shouldn t take you more than a few hours. 4 add a single 2x10 header between the doubled joists to carry the 1 stub joists from the beam. Now consider the same floor joist supporting stone tile flooring such that floor dead load is now 20 psf. However the limit on total deflection is span 720 resulting in the need for total deflection to be only 0 50 half of the 1 00 value for span 360.

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. Joists are spaced at regular intervals much like the studs in a wall frame. If we use the same joist total deflection will be 1 50 1 25 0 25.

Also when installing the joist supports you need to make sure that they are level. The floor framing for bathtubs requires special attention. If the floor was built using the general 16 inch spacing you can expect a bathroom floor to safely hold 40 psf. You must consider all of the weight the floor joists must be able to support.

Planning on laying tile in our house. This provides sufficient support for most cast iron bathtubs which run under 500 pounds even when full.