Deck Repair - Rotting

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Old 08-02-20, 05:38 AM
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Deck Repair - Rotting

Hello all-

My deck is 12-15 years old. It was well built using pressure treated lumber and treks decking. It was also trimmed with pine which has started to rot in some spots. Iíve been replacing the rotting pine trim with pvc trim.

While removing pine in one particular corner, I noticed the pressure treated joist is also rotting in the corner (rest seems fine). What would be the best approach to repairing? Can I cut out just the rotting section and replace?

i should mention that we have a jacuzzi that sits on top so I wouldnít be able to remove the treks decking unless I have the spa removed.

i suspect this was caused by water getting between the pine trim and joist over the years...

Thoughts?



 
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Old 08-02-20, 05:43 AM
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That rim joist should be replaced. If you go under the deck and temporarily support the deck you should be able to replace those boards without removing the jacuzzi.
 
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Old 08-02-20, 05:46 AM
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If those rims are structural, and I assume they are, the entire board needs to be replaced from bearing to bearing. I have never seen treated wood do that. Wonder if it has anything to do with the pool chemicals as well?
 
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Old 08-02-20, 05:48 AM
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I assume it's from water getting trapped between the joist and the pine trim.
 
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Old 08-02-20, 05:54 AM
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Agree on the water getting trapped in between pine trim and pressure treated. Now I question whether to replace the pine trim at all.

i have noticed other sections of rotting trim over joists. I havenít removed to inspect the joists though.

 
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Old 08-02-20, 07:34 AM
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What I see as unusual is that it's in the corner only!

Face trim is not unusual, I have it on my deck, but wondering if something else is going on that is not allowing water to drain through the deck boards and is being channeled to the corner.
 
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Old 08-02-20, 09:25 AM
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I am seeing this kind of problem more often in the past 15 years since they changed to non arsenic treatments. Modern, treated 2"x lumber really needs good airflow to all sides and the ability to dry out.
 
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Old 08-02-20, 09:44 AM
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I'd think the extra moisture comes from the jacuzzi. The deck could be pitched ever so slightly to that corner also.
 
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