Hello everyone, I hope I found the right section in the forum. My plan is to build an outdoor kitchen on my newly built deck.
The plan is to frame a construction similar to a built-in kitchen base placed on the deck and then cast a concrete slab with rebar, which will be placed on the structure with cutouts for the sink and grill.

Now to the question.
According to my calculations, the concrete slab will be approximately 4 sqm (5.8m,*0.7m) in total minus cutouts for the sink and grill. The grill itself doesn't add much weight since it weighs about 50kg.
In total, I'm estimating 400kg (100kg/sqm) plus whatever I end up putting in the cabinets.
Additionally, there are windbreaks to be attached around, as well as a bunch of 100kg guys standing around chatting while grilling in the new kitchen.

How should one reasonably calculate the load-bearing capacity of the deck? What should I find out to avoid the risk of the entire deck sinking at the corner? What can be done to reinforce the deck, etc.? All help and tips are appreciated.
 
  • Illustration showing a planned outdoor kitchen layout on a deck, with dimensions 4m by 2.5m circled in red, surrounded by greenery and other deck elements.
If the deck is constructed according to "all the rules of the art," it should withstand at least 200 kg/m2. But it is likely to hold even more.
 
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There should be no problem unless the deck is under-dimensioned. If you want it verified with a calculation, a sketch of the construction as well as the timber dimensions of the support beam, floor joists, and their center distance is needed.
 
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