AboutBruce E. Johnson Expertise I can answer any construction related question in regards to carpentry, concrete, drywall, masonry, structural elements of any type of building, residential or commercial. Interior or exterior.
Experience Custom Commercial and residential buildings. Churches, theaters, schools and auditoriums. Most recently I am working with the Catholic Church on several design build committees. I have a website related to scheduling and project supervision. Although my expertise is more related to multimillion dollar commercial, educational and theatrical projects my generous credentials in residential and remodelling construction make me a viable source of information regarding all forms of building questions.
Expert: Bruce E. Johnson Date: 5/10/2008 Subject: weight garage can hold
Question QUESTION: I want to add a therapy spa that filled will weigh 12,000 pounds. I have a standard two car garage that must house a 4500 lb car, as well as the spa. Will the average garage floor take atleast 15,000 pounds without cracking?
ANSWER: Hi Nancy, a standard concrete slab contains minimally 2500 psi concrete. Which means that it has a compressive strength of 2500 pounds per square inch. A water filled tub will transfer that weight over the area of the tub. So if your tub is say 24" x 50" that would be 1200 square inches so you see that your slab will easily hold up that much weight. I hope this information helps feel free to write again regarding this or other matters, sincerely bruce e johnson. bejohnsonconsulting.com
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QUESTION: Just to be sure,since I did not give you the dimensions in my first question, if the spa is 7' by 7' and 54 inches deep, that will not be too much weight for the garage?
Thank you, again!
Answer Hi again nancy, you will be fine. That weight spread over a 7'x7' area or 7056 square inches only amounts to 2 pounds per square inch. Your concrete is capable of 2500 pounds per square inch of compression. I am assuming that your floor was poured over a well compacted base. But you get my point? 2 psi is pretty negligible for a concrete slab. Think of your car. It is 4000 pounds and it sits on four wheels that total maybe 400 sq. inches and yet your slab supports that concentrated load easily. I hope this information helps feel free to write again regarding this or other matters, sincerely bruce e johnson. bejohnsonconsulting.com
