Trex over subfloor


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Old 04-21-24, 04:50 PM
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Trex over subfloor

Can I install Trex over and existing subfloor in a covered porch that does not get wet? The subfloor is 30 years old and in perfect shape other than one area near a door. The moisture issue there has been fixed by installing a gutter.

If it is ok to put the trex over the subfloor, will the additional thickness prevent the trex hidden fasteners from penetrating far enough into the floor joists?

Thank you!
 
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Old 04-21-24, 06:54 PM
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If this is not outside and does not get wet, why would you want to use deck flooring material?
 
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Old 04-21-24, 07:27 PM
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The waterfront deck out that door and the small deck on the other side of the screened in porch are both newly done trex. We want to keep the look uniform and not add another flooring in between the two.
 
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Old 04-21-24, 07:52 PM
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The mfg does not warrantee the product over a solid surface. If you're willing to assume the liability you can do it but know that it will be prone to get debris between the planks that will make it difficult to clean.
 
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Old 04-22-24, 04:41 PM
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I would look at LVP flooring that is designed for bathrooms: https://www.homedepot.com/p/Lifeproo...06LP/309083456
 
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Old 04-23-24, 05:44 PM
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We will be using Trex and not another material. Can we install it over the subfloor or should I pull the subfloor.

Are the Trex hidden fasteners long enough to go through the subfloor and penetrate the floor joists well

Thank you
 
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Old 04-23-24, 05:46 PM
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There is no problem with using the hidden fasteners. I already answered the rest of your question pretty clearly.
 
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Old 04-23-24, 06:11 PM
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Yes you did xsleeper and I appreciate your time and information. In your opinion am I better off pulling the subfloor? It will be a giant PIA so I was hoping to avoid it.
 
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Old 04-23-24, 06:18 PM
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Like I said if you don't mind the dirt or no warranty due to possible water trapped under it or extra heat from lack of ventilation you have to weigh the pros and cons. It will also be higher than the Trex outside.

I can't say one way or the other, it's your project. If you pull the subfloor you will likely need to add some framing here and there to fasten the Trex to. Plus if the bottom is not sheeted you have the bugs able to come inside. If the floor is insulated and sheeted on the bottom I would lean toward going over your subfloor. But you'll need to clean those grooves with a leaf blower. You didn't say the joist spacing but hopefully it is 12" or 16" and not 19.2 or 24".
 
 

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