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3/4" hardwood, same direction as joists?

6K views 13 replies 5 participants last post by  Zero Punch 
#1 ·
We will be installing 3/4" Brazillian Redwood in the master bedroom in a few weeks. The joists are 2' apart and there is 3/4" plywood over them. There appears to be slight sagging in between the joists. Not severe, but enough to notice if looking across them. I know it is highly recommended to run the hardwood perpendicular to the joists, but if given a choice, we would really prefer to run them in the same direction as the joists. What are the short/long term issues associated with running them parallel to the joists? What if anything, can be done to safely run them parallel to the joists?
 
#4 ·
In my opinion to make the floor good enough to run parallel with the joist would take too much money, time and hard work. I'm shocked to hear that the joist are 2 feet on center. That is most of your problem. In my opinion to fix it you would need to add another joist between the ones you have to give enough support and take out the sag but that is not a guarantee.
 
#7 ·
Lost here too. My very first thought after reading about the 2x4's was that your joists were 2x4's turned on their sides, but........naaaaaa that CAN'T possibly be.

That's not called a floor...that's called a trampoline.:jester:

Full size (the size of the joists) blocking in between the joists every 16" O.C. would be my first choice if I just had to have the hardwood running parallel with the joists.
 
#10 ·
My house is the same - trussed 2x4 joists, 24" OC - and I have no sag or spring in the floors. I've been very happy with the strength of our trussed joist system, and it makes fishing wires, etc very easy between floors.

How thick is your decking? I've got 3/4" plywood, and haven't noticed any sag or spring.
 
#11 ·
The plywood is 3/4" as well. I have to be honest here a second. The master bath is where I noticed the sagging, I havent actually checked the master bedroom, I just made the assumption that there would be some, due to the 24" OC joists, and from seeing some sag in the bathroom. I also know that there were squeaking problems with the floor after the houses were built and the previous owner had to have the builder come back and add alot of screws to the floor in various places to try and fix the problem. I still have squeaks that I'll be chasing soon.

When there was sagging in the bathroom, I noticed it was primarily noticeable where 2 sheets of plywood came together, they seemed high at the seem and low on the very next joists.
 
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