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Old 08-13-2019, 08:12 AM   #1
Chisos
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Floor joist and deflection rating

Hello,

We are having a bathroom added to the house. The perimeter foundation is a poured concrete base with 2 rows of concrete blocks. The joists are 2x8 pine, 16oc, 10 span. Does it change the deflection rating if those joists are attached using joist hangers to attach to stringers that have been attached to blocks?

I plan to put down porcelain tile over ditra xl as in the rest of the house.

Thank you so much for your help!!
Melody
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Old 08-13-2019, 08:15 AM   #2
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How the joist are attached make little difference compared to the other prime factors of wood species, joist cross section, spacing, and span.
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Old 08-13-2019, 08:24 AM   #3
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Welcome back, Melody.

This the same house you were working on last year?

The floor joist attachment to a rim joist using metal hangers is a sound building method. The attachment of the rim joist, if not set atop the foundation wall, is usually the weak link.

My opinion; worth price charged.
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Old 08-13-2019, 08:48 AM   #4
Chisos
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Thank you so much!

Yes, this is the same house - we will probably be working on it until I die or it kills me.

I was unsure of the joist hangers affect on d-rating so I had them change to 12" oc. That gives me much more wiggle room on deflection rating anyway - which I like. I wanted to get that changed before they began attaching things. The guys seem to be in a much better mood when I make changes to their plan BEFORE they execute them.
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Old 08-13-2019, 10:22 AM   #5
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Hey Melody

12O.C makes me giggle ... I like that sort of insurance under foot . Reducing
Joist spacing is under rated ( I believe) ...it does a lot to reduce point load deflection and Ive suspected many of the engineered I-joist systems have not helped us in this regard with odd allowances Ive seen at 19.2 or 24 0c .
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Old 08-13-2019, 10:42 AM   #6
speed51133
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my house has engineered trusses with like 20in spacing.

The hvac guy cut through many strongbacks to run the venting....

The floor was like a trampoline until I repaired them. Too bad your deflecto does not figure trusses into the calcs.
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Old 08-14-2019, 05:35 AM   #7
Chisos
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Thank you all for the replies.

My GC dropped by in the afternoon to check on the job and was trying to tell me it was a bit excessive to go 12oc. Told him I'm doing the tiling, I'm old, I only have one more tile job left in me and I want it perfect. I can do my part perfectly but need his part to be perfect.

Later I went out to check and found them nailing the Advantix to joists - no, no, no boys. I want it screwed every 8". Sad faces but they did it.

At this point, to his credit, my GC tells the guys to "just do what she says". Makes me smile!
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