How can I flatten hardboard?

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Forum topic by BobE posted 04-26-2010 05:18 PM 5626 views 0 times favorited 7 replies Add to Favorites Watch
View BobE's profile


28 posts in 3968 days

04-26-2010 05:18 PM

Topic tags/keywords: hardboard flatten question

I have a piece of 1/8” hardboard that has an S curve along one edge and won’t lay flat like I need it to. I tried laying it on a flat surface and throwing weight on top of it for a couple of days and there doesn’t seem to be any change in its shape.

How can I flatten hardboard ?


7 replies so far

View Michael Murphy's profile

Michael Murphy

454 posts in 4021 days

#1 posted 04-26-2010 05:31 PM

Put it in a frame. Stick it to something stiffer.

-- Michael Murphy, Woodland, CA.

View Karson's profile


35270 posts in 5416 days

#2 posted 05-20-2010 02:21 AM

Buy another piece.

Sorry. A frame is probably the only way. If you want it un framed, you are in trouble.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Appomattox Virginia [email protected]

View hazbro's profile


109 posts in 4005 days

#3 posted 05-20-2010 02:56 AM

what is hardboard? Is that the same as masonite?

if it is you can glue it to whatever you need it to lay flat on. with rollers and a lot of pressure. otherwise it’s new sheet time.

-- measure once, keep cuttin' til it fits

View thatwoodworkingguy's profile


375 posts in 3945 days

#4 posted 05-20-2010 04:50 AM

buy a new hardboard haha

-- ~Eagle America~ ~Woodcraft~

View MrsN's profile


988 posts in 4541 days

#5 posted 05-20-2010 07:09 PM

what do you want to use it for? Sometimes you can flatten it as you glue or nail it to your project.

View a1Jim's profile


118161 posts in 4592 days

#6 posted 05-27-2010 12:07 AM

I’m with the get another piece group.


View BobE's profile


28 posts in 3968 days

#7 posted 06-10-2010 09:16 AM

Water did the trick. I used a spray bottle to spray down the textured side of the piece of 1/8” tempered hardboard around the bent area. Then I sopped up as much excess water as I could with a paper towel. After that I laid the hardboard on a flat surface wet side up, and threw some weight on top of it using scrap wood to distribute the weight as evenly as I could. Inside of a few hours it was dry and flat as could be.

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