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MDF use?

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Forum topic by zipmac22 posted 06-20-2017 10:06 PM 438 views 0 times favorited 7 replies Add to Favorites Watch
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zipmac22

16 posts in 687 days


06-20-2017 10:06 PM

I’m putting up trim around the garage door opening. I found some Finished Elegance MDF which is listed for interior use. If I seal the ends can the MDF be used outside? I plan on painting it too, so the boards will be sealed up pretty tight. Thanks!


7 replies so far

View ScottM's profile

ScottM

565 posts in 1980 days


#1 posted 06-20-2017 10:27 PM

I wouldn’t use it for that. It will just soak up any water and swell then fall apart.

View builtinbkyn's profile

builtinbkyn

1921 posts in 774 days


#2 posted 06-20-2017 10:31 PM

Yeah not for exterior use. As Scott said, it will soak up water, swell and fall apart in short order no matter how you try to seal it up.

-- Bill, Yo!......in Brooklyn & Steel City :)

View Madmark2's profile

Madmark2

371 posts in 422 days


#3 posted 06-20-2017 10:38 PM

MDF is contraindicated in damp to wet locations. It will swell & dissolve over time in high humidity without direct liquid contact.

M

View Desert_Woodworker's profile

Desert_Woodworker

1281 posts in 1048 days


#4 posted 06-21-2017 04:31 AM

I am not surprised by the comments above, but there is a MDF product; MEDEX. That is for exterior use; Exterior sign companies use it. I use it (see my projects)

-- Desert_Woodworker

View TheFridge's profile

TheFridge

8287 posts in 1320 days


#5 posted 06-21-2017 04:45 AM

Regular mdf definitely not.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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Loren

9606 posts in 3481 days


#6 posted 06-21-2017 04:49 AM

MDF is almost waterproof on its faces. I have
a piece of MDF off a tool stand that has been
kicking around outside on the ground for
several years now and it is in better shape
than I would have expected. It certainly hasn’t
crumbled like wet particleboard will.

If you seal the edges well perhaps MDF will
hold up outdoors for awhile. But I would
be prepared for the material to fail sooner
than later.

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MrUnix

5978 posts in 2033 days


#7 posted 06-21-2017 04:50 AM

I am not surprised by the comments above, but there is a MDF product; MEDEX. That is for exterior use; Exterior sign companies use it. I use it (see my projects)
- Desert_Woodworker

I’m sure it’s being used as you describe… but from their web site it says:

Limitations: Medex® is not suitable for structural applications, exterior siding or exterior trim

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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