Reinforce wooden joists Bathroom...

[TobiasGren]

Hello, I want to double-check with the rest of you how. I'm thinking. I'm renovating the house and converting a former bedroom into a bathroom.

As it seems, I have to deviate from the recommendations (GVK).
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My basic conditions are:
- Existing floor joist C24 45x190 CC60 Support distance 2990mm
- Floor chipboard 22mm

On this, I plan to glue/screw floor gypsum, then reinforce and apply leveling compound/floor screed.
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As it looks, the problem is that the floor joist is 190mm instead of the recommended 220mm.

What do the rest of you think, with the double reinforcement regarding floor gypsum + reinforcement/floor screed? Will the floor achieve the equivalent stability that the GVK recommendations seek?

The alternative is that I rip up the entire floor and add additional joists on cc30, followed by the aforementioned Floor chipboard/floor gypsum/reinforcement and floor screed.

Grateful for your objections and thoughts.

/Tobias

 

[justusandersson]

Your 45x190 in combination with screwed-glued 22 mm chipboard is sufficient to meet both deflection and flex requirements. Mainly due to the limited span. The other adds nothing from a stability perspective.

 

[TobiasGren]

Your 45x190 in combination with screw-glued 22 mm particleboard is enough to meet both deflection and bounce requirements. Mainly due to the limited span. The other adds nothing from a stability point of view.

Thank you for your response. What is your reasoning based on, can I calculate this in some way? As it is. Now there is a 30mm difference in the joists compared to the recommendations, which should then imply a certain/significant difference due to the deviation.

 

[justusandersson]

What do you base the reasoning on

Elasticity theory and the applicable construction rules. GVK is an industry standard.