My Kitchen was extended to which half the floor is concrete, the other half (the extension) is a suspended floor with 6 inch joists every 35cm.
The floor feels a tad spongy which was fine for laminate but I'm going to tile the floor so have been advised to stiffen it a little.
Under the floating floor is a drop of about 1 meter with a concrete base underneath. Think of it as a mini cellar underneath.
I'm thinking of simply wedging some upright wooden struts between the concrete base and the joist. I've done this on one and the joist feels a lot more firmer as a result. The strut is 2inch squared in thickness.
My question is : will expansion of the strut push the joist up enough to pop the tiles above? Anything I can do to stop expansion of the strut? ... or am I over thinking?
IDEALY, A VENTED DWARF WALL SHOULD BE BUILT TO SUPPORT JOISTS.
YOU CERTAINLY WON'T BE THE FIRST OR THE LAST PERSON TO ADD EXTRA SUPPORT TO THE FLOOR IN THE WAY IN WHICH YOU DESCRIBE AS IN A TIMBER FLOOR ONLY THIS WOULD ACHIEVE THE DESIRED EFFECT BUT BECAUSE YOU WANT TO TILE THE FLOOR, YOUR CONCERNS OVER THE EXPANSION PROBLEMS ARE VALID ONES.
ALSO, ANY TIMBER RESTING ON CONCRETE SHOULD HAVE A DPM INSERTED INBETWEEN AND THE TIMBERS FIXED INTO POSITION RATHER THAN JUST BEING WEDGED.
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