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Old 11-20-2008, 07:59 PM - Thread Starter
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How heavy is a sheet of 4x8 MDF? You'd think it would be easy to find this out, but I yahoo searched it and didn't come up with anything on the first couple pages of searching.

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Old 11-20-2008, 08:00 PM
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.75" x 4' x 8' = 96 pounds

It does vary depending upon the quality though.
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Old 11-20-2008, 08:12 PM
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Quote:
Originally Posted by CZ Eddie View Post

How heavy is a sheet of 4x8 MDF? You'd think it would be easy to find this out, but I yahoo searched it and didn't come up with anything on the first couple pages of searching.

I did that same thing at work years back. Luckily I get paid hourly because it was fairly hard to find.

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Old 11-20-2008, 08:17 PM
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It depends on how thick the MDF is ...

I used 32mm (1"& 1/4")thick MDF 2420x 1215 sheets to buld some subs and I can tell you that it was pretty weighty around 150lb per sheet easily....

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Old 11-20-2008, 08:26 PM
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That's not very common...certainly not Home Depot or Lowe's as far as thickness goes. The max they carry is 3/4" which is unruly and heavier-than-a-son-of-a-bitch. Yes, that's my official measurement. Get a gorilla or a mook to move it with you, unless you are either a gorilla or a mook, in which case you'll just need an A/V dork to help hold up one end...

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Old 11-20-2008, 08:34 PM
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I suppose I must be A gorilla then, I know when I asked "pushed" my mr's to help lift my 32mm MDF sheets she was struggling A little ....

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Old 11-20-2008, 08:57 PM - Thread Starter
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Thanks, everyone!

Quote:
Originally Posted by Ventoso View Post

.75" x 4' x 8' = 96 pounds

It does vary depending upon the quality though.

Perfect... 3/4 is what I forgot to mention.
96lbs is pretty darn heavy for a single sheet! Though now that I read the number, I think I already knew the answer but had forgotten it. edit... no nevermind, "96" is familar because that is how many inches long it is (supposed to be). doh!

Quote:
Originally Posted by Looneybomber View Post

I did that same thing at work years back. Luckily I get paid hourly because it was fairly hard to find.


Hahah. I once took a two-week assignment in between contracts, doing Internet research. What a kick-back job that was.

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Old 11-20-2008, 08:58 PM
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I beat you all with my 36mm MDF.

However since I live in metric land posting up the weight isn't going to help anyone.

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Old 11-20-2008, 08:59 PM - Thread Starter
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Right. We ban people who post in metric.
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Old 11-20-2008, 09:44 PM
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O come on stop picking on our advanced more precise metric measurement scale system.....
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Old 11-20-2008, 10:30 PM - Thread Starter
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Old 11-20-2008, 10:36 PM
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My local supply shop has "ultralight" MDF which is about 20-25 lbs lighter and has the same properties (actually it is much easier to work with). Almost no cabinet shops in the area use regular MDF anymore. Perhaps the greater density is better for speaker boxes, but I'm not sure it really makes much difference for most applications (other than on your back).
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Old 11-20-2008, 10:47 PM
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So instead of MDF its "LDF " 'Low Density fiber' Board....

Cheers....
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Old 11-20-2008, 10:48 PM
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You need to get one of these. http://all-wall.com/acatalog/Sta...anel_Carry.php

Menards sells them. They make a huge difference.

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Old 11-21-2008, 01:04 AM
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2 statements here that are absolutely false.....


1. a single sheet of 3/4" 4x8 mdf does not weight 96 lbs..not matter how good a quality it is, you may find that it FEELS like it does...but it does NOT. I will weight one of my sheets tomorrow and report back...i bet it is closer to 70lbs. i have weighted 1"mdf and it was 84bs....and felt like 120lbs

2. Lightweight MDF does not weight 20 to 30 lbs lighter...it weights 20 % lighter....so maybe 15lbs lighter max.

Tim
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Old 11-21-2008, 04:43 AM
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According to this site it's 96 pounds... and I know the author and I beleive him.

MDF Weight

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Old 11-21-2008, 04:44 AM
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Quote:
Originally Posted by dbbarron View Post

My local supply shop has "ultralight" MDF...

Yeah, it's called particle board...or maybe cardboard.

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Old 11-21-2008, 05:07 AM
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No its not...its called trupan MDF light
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Old 11-21-2008, 06:12 AM
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I stand corrected, but for twice the price why not go for a hardwood ply?

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Old 11-21-2008, 07:58 AM
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Just find the density and multiply by the volume...

Wikipedia says density is .022 to .029 lb/in^3

My sheets are always an inch over each dimension so....

49x97x.75x.022 = 78.4 lb min

49x97x.75x.029 = 103.4 lb max

Not that hard...
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Old 11-21-2008, 08:23 AM
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Maybe not for an engineering intern...

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Old 11-21-2008, 11:15 AM
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Quote:
Originally Posted by Ventoso View Post

.75" x 4' x 8' = 96 pounds

It does vary depending upon the quality though.

Ouch! Each of my subs are made from three full sheets of .75" MDF.
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Old 11-21-2008, 11:16 AM
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FWIW, the sheets I recently bought from Lowes are .02595 lbs/in³. I know this because I'm building a new box with some irregular shaped bracing, so the easiest way to calculate internal volume was to weigh a piece with a known volume (a square piece I had already cut), then weigh each brace and calculate it's volume based on the measured density. I think most of these are oversized an inch in each direction, so a whole sheet from my Lowes should weigh around 92.5 lbs.

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Old 11-21-2008, 01:20 PM
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I will say it is so heavy that when you try to move it while being in a wheelchair and it falls over on your head while wearing a baseball hat, it will cut your head open a bit when it hits the little button on top.
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Old 11-21-2008, 03:07 PM
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Quote:
Originally Posted by CZ Eddie View Post

How heavy is a sheet of 4x8 MDF?

Southern answer...Heavy.

Detailed southern answer...Heavier than sh**!
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Old 11-21-2008, 03:30 PM
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Quote:
Originally Posted by tundrSQ View Post

2 statements here that are absolutely false.....


1. a single sheet of 3/4" 4x8 mdf does not weight 96 lbs..not matter how good a quality it is, you may find that it FEELS like it does...but it does NOT. I will weight one of my sheets tomorrow and report back...i bet it is closer to 70lbs. i have weighted 1"mdf and it was 84bs....and felt like 120lbs

2. Lightweight MDF does not weight 20 to 30 lbs lighter...it weights 20 % lighter....so maybe 15lbs lighter max.

I was completely wrong and i'm sorry!!!!

The 2 sheets i just finished cutting for my new box weighed 92lbs each.....and i felt every lb hefting each sheet up onto the table saw by myself....thank got it was a nice PM66 with excellent out fed and a nice side table....2 sheets took me less than 20 minutes to cut into 20 different pieces

Tim
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Old 11-21-2008, 11:12 PM
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i always guessed a sheet of 3/4 MDF right around 80 pounds. i was also always told regular birch plywood weighed 55-60 pounds per sheet.
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Old 11-22-2008, 05:46 AM
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Quote:
Originally Posted by tundrSQ View Post

....thank got it was a nice PM66 with excellent out fed and a nice side table....2 sheets took me less than 20 minutes to cut into 20 different pieces

Nice saw! I've got a 52" Unisaw, but it ain't no PowerMatic 66...

Jason
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Old 11-22-2008, 06:11 AM
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Quote:
Originally Posted by JasonColeman View Post

Nice saw! I've got a 52" Unisaw, but it ain't no PowerMatic 66...

Jason

They are both great saws...the PM66 lives in the wood shop portion of the signshop i manage. I also have a cnc router which i will use to make the cutouts

My home saw is a delta contractor saw with crappy DC, so large mdf projects get done at work.

Tim
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Old 11-22-2008, 10:10 AM
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Quote:
Originally Posted by exojam View Post

I will say it is so heavy that when you try to move it while being in a wheelchair and it falls over on your head while wearing a baseball hat, it will cut your head open a bit when it hits the little button on top.

Ouch!

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