How can I flatten hardboard?

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by BobE posted 04-26-2010 05:18 PM 3372 views 0 times favorited 7 replies Add to Favorites Watch
View BobE's profile


28 posts in 2370 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

449 posts in 2422 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


35032 posts in 3818 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. Southern Delaware soon moving to Virginia †

View hazbro's profile


109 posts in 2407 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 2347 days

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

buy a new hardboard haha

-- ~Eagle America~ ~Woodcraft~

View MrsN's profile


975 posts in 2943 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


115167 posts in 2994 days

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

I’m with the get another piece group.

-- Custom furniture

View BobE's profile


28 posts in 2370 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.

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