How come construction lumber has rounded edges....

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Blog entry by Farrout posted 09-28-2014 06:42 PM 2174 reads 0 times favorited 5 comments Add to Favorites Watch

...and ‘premium cut’ lumber has square edges?

-- If we learn from our mistakes, I should be a genius!

5 comments so far

View longgone's profile


5688 posts in 2728 days

#1 posted 09-28-2014 07:12 PM

splinter prevention…those in construction do not caress a piece of construction lumber the same way we treat our expensive hardwoods

View stefang's profile


15512 posts in 2754 days

#2 posted 09-28-2014 07:25 PM

I would like to think that it is for handling safety, but I believe it is mainly done to help prevent it from catching fire while its drying out. My guess is that since sharp edges splinter easily, they leave thin pieces of wood which dry very quickly and easily ignite. I see at the large lumber yards here in Norway where the boards are cut and planed that they have sprinker systems that they water the lumber with when it’s warm to prevent fire as construction fir burns quite readily.

I would think that premium lumber is a lot more dense and therefore not too easy to ignite and it is usually stickered and covered to dry outdoors or kiln dried and in both cases probably stored under a roof after that.

-- Mike, an American living in Norway.

View FirehouseWoodworking's profile


684 posts in 2693 days

#3 posted 09-28-2014 08:33 PM

Stefang is absolutely correct.

Construction grade lumber has “rounded” edges to make it less susceptible to catching fire, both while drying and in construction use. Sharp edges or corners catch fire much easier than do rounded ones.


-- Dave; Lansing, Kansas

View firefighterontheside's profile


13068 posts in 1276 days

#4 posted 09-28-2014 08:36 PM

Wow, I had no idea.

-- Bill M. "People change, walnut doesn't" by Gene.

View lightweightladylefty's profile


3127 posts in 3132 days

#5 posted 09-30-2014 05:19 AM

It’s amazing what we can learn here!


-- Jesus is the ONLY reason for ANY season.

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