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I’m redoing the bathroom and en-suite. On the first floor, the joists that support them are only supported at each end spanning a wall and RSJ. Total span is about 4 meters. The wall between them is stud and intend to tile both sides as well as the floors. One room has bath the other one shower.
Is there a way to determine if the weight of ply/ tiles/board/adhesive/people/water in bath etc is going to be supported.
Being a bathroom be a few cuts in the joists for pipes etc too.
What size are the joists?
Google timber span tables, find a size that matches or is slightly smaller than what you have and it will tell you the max span for that size
Open the joist pockets up - bed and sandwich bolt some mild steel channel either side of the load bearing joists, Mag drill through the centre line of the joists for services.
What a shit New Year when I'm talking about joists at 12:50 am
Yep you'll need the size of the joists and their spacing. How old is the property, any grading info on the joists that might be helpful? Though at 4.0m span deflection is likely to govern.
Was this space previously a bathroom / ensuite?
Alternative to channels being bolted into the sides of the joists you may be able to double up the floor joists if required. Also any service penetrations should be at mid depth and at third points.
Are you set on tiles? Vinyl floor and showerwall for the walls will be easier, better and lighter (if that really is an issue).
The bath is the key thing, not just for the weight of water but because it comes and goes. Depending where it is on the span, and whether the bath is parallel to the joists or across them and so sharing the weight more, there could be significant deflection that could cause problems with tiles.