Author Topic: exterior MDF  (Read 600 times)

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Offline afish

  • Posts: 601
exterior MDF
« on: September 09, 2021, 05:25 PM »
Anyone have first hand experience with using exterior rated MDF outside?  I have some doors I need to make for an outdoor kitchen and thinking about trying it.  Im in South Florida so its going to get tested for sure.  I would most likely finish with a 2x urethane and would most likely seal all the machined edges with epoxy first (this is my SOP for regular MDF door and drawer fronts for bathroom vanities) but this is the first true exterior project like this.  Seems like it could work but would like to get some opinions since there is not a lot of info out there good or bad.

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Offline Peter Halle

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  • Posts: 12394
  • Remington Steele - My Third Boy
Re: exterior MDF
« Reply #1 on: September 09, 2021, 08:11 PM »
No experience with the product you are looking for, but a possible alternative is MDO two sided.  Was used for highway signage for years and still is used for exterior signage.

Just a thought.


Offline Oldwood

  • Posts: 491
  • Alberta, Canada
Re: exterior MDF
« Reply #2 on: September 09, 2021, 10:40 PM »
We have used Extira, it holds up very well. It is a little courser texture but paints well.
Real knowledge is to know the extent of one's ignorance.

Offline afish

  • Posts: 601
Re: exterior MDF
« Reply #3 on: September 10, 2021, 07:02 AM »
Thanks guys,  Im thinking I will give this a shot.  I found a video on YT
that gave me some piece of mind even though every bone in my body says no MDF outside.  As far as the MDO goes I have used it (not for outdoor) projects before and while its nice, without some type of substrate to keep it flat I wouldnt trust it for making doors due to warpage. 
« Last Edit: September 10, 2021, 07:10 AM by afish »

Offline Packard

  • Posts: 642
Re: exterior MDF
« Reply #4 on: September 10, 2021, 10:33 AM »
The last I checked 1/2" MDO is available from Lowes, but not from Home Depot.  By special order only. My local lumber yard does not carry it.

Grimco carries a variety of sign substrates, including MDO, aluminum and plastic.

Offline Doug S

  • Posts: 538
Re: exterior MDF
« Reply #5 on: September 10, 2021, 02:49 PM »
I use Tricoya a bit and have found it to be really good stuff, it's fantastic for things like panels in doors. Only things to consider are you should use stainless steel fixings with it and it's expensive!

Here's a guy making an MDF gate out of it.