LumberJocks

Proper MDF Application

  • Advertise with us

« back to Wood & Lumber forum

Forum topic by Joe posted 11-04-2018 01:04 PM 396 views 0 times favorited 6 replies Add to Favorites Watch
View Joe's profile

Joe

23 posts in 3114 days


11-04-2018 01:04 PM

Topic tags/keywords: mdf humidity heat swelling

Hello All,

I’m building my first project with MDF and now that it’s finished and ready for paint I have a concern. I built a radiator cover for a steam radiator and now I’m wondering how compatible the MDF is going to be with the slight amount of moisture that escapes from the radiator vent. I was planning to give it a couple of coats of de-waxed shellac before the color coat for protection. Is this a good use for the MDF?

-- Joe


6 replies so far

View BFamous's profile

BFamous

316 posts in 543 days


#1 posted 11-04-2018 01:35 PM

MDF is going to move less (aka not at all) than normal wood due to the changes in humidity. As long as it is sealed properly so that the fibers do not get wet from the moisture, which would cause them to swell, you should be fine in my opinion…

-- Brian Famous :: Charlotte, NC :: http://www.FamousArtisan.com

View Lazyman's profile

Lazyman

3570 posts in 1810 days


#2 posted 11-04-2018 02:18 PM

Perhaps you used a formaldehyde free MDF but I would be more worried about formaldehyde or other VOCs being released into the room when it heats up. I would certainly not want to take the risk, especially if you have kids.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View Bill White's profile

Bill White

5210 posts in 4383 days


#3 posted 11-04-2018 02:44 PM

I have posted several times about my use of a moisture resistant MDF product called Extera. Very stable, and used for exterior applications. May not be easily available, but sure is good stuff for jigs needing to last for a long time. Might be the product that you need.

-- [email protected]

View jmos's profile

jmos

916 posts in 2792 days


#4 posted 11-04-2018 02:48 PM

I think it was the last Fine Woodworking podcast (or a recent one in any event) where they were discussing that MDF does move with moisture. The comment was made in the context of most folks not knowing this. Surprised me.

I don’t use it much, so couldn’t say for sure.

-- John

View lumbering_on's profile

lumbering_on

578 posts in 912 days


#5 posted 11-04-2018 03:10 PM



I think it was the last Fine Woodworking podcast (or a recent one in any event) where they were discussing that MDF does move with moisture. The comment was made in the context of most folks not knowing this. Surprised me.

I don t use it much, so couldn t say for sure.

- jmos

Yes, MDF does expand and contract, but it does it in a uniform fashion. I found this out when I installed some wainscotting I made out of 1/2” MDF. It meant I spent a fair bit of time going back and touching it up, but it’s still better than using pine.

View oldnovice's profile

oldnovice

7488 posts in 3790 days


#6 posted 11-04-2018 06:17 PM

I know that MDF swells with moisture, so if that is movement, it does move!

-- "I never met a board I didn't like!"

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com