Anyone can give a quick answer to Plywood Density? Or just average weight
per square foot of .5 in Plywood.
It seems my calculation to by boat weight is wrong.

Thanks in advance

Here's an answer . . but you will have to apply some math & logic.

You didn't say what thickness, so perhaps you are looking for a 'Universal
Constant'. Because it is inherently a natural product, I don't believe there
is one. However here is something that can be used in the same vein.

A 4x8 sheet of 1/4 inch ply weighs 'about' 25 pounds. This seems to be a
fairly constant 'multiplier' - i.e. a 1/2 in thick sheet weighs about 50
pounds, and a 3/4 inch about 75 pounds.

Do some simple calculations and you get the weight per square foot, or even
down to per square INCH, if you need it.

Regards & Good Luck,
Ron Magen
Backyard Boatshop
{PS - There ARE tables that give the density of different woods {by
species}. This could be used to approximate the additional mass of your
scantlings}
"mscres" wrote in message
...
Anyone can give a quick answer to Plywood Density? Or just average weight
per square foot of .5 in Plywood.
It seems my calculation to by boat weight is wrong.

Thanks in advance

Then: 25/32*4*12 = 37.5 lbs per cubic foot.

Thank You,





"Ron Magen" wrote in message
news:rlwhh.4120$386.1011@trndny01...
Here's an answer . . but you will have to apply some math & logic.

You didn't say what thickness, so perhaps you are looking for a 'Universal
Constant'. Because it is inherently a natural product, I don't believe
there
is one. However here is something that can be used in the same vein.

A 4x8 sheet of 1/4 inch ply weighs 'about' 25 pounds. This seems to be a
fairly constant 'multiplier' - i.e. a 1/2 in thick sheet weighs about 50
pounds, and a 3/4 inch about 75 pounds.

Do some simple calculations and you get the weight per square foot, or
even
down to per square INCH, if you need it.

Regards & Good Luck,
Ron Magen
Backyard Boatshop
{PS - There ARE tables that give the density of different woods {by
species}. This could be used to approximate the additional mass of your
scantlings}
"mscres" wrote in message
...
Anyone can give a quick answer to Plywood Density? Or just average weight
per square foot of .5 in Plywood.
It seems my calculation to by boat weight is wrong.

Thanks in advance

Depends on the type of wood. Okoume is about 30 lb/cf Meranti is 37 lb/cf.
US marine fir plywood is about 35 lb/cf. In general softwood plywoods
weigh about 5% more than the wood it is made from. Heavier hardwood plywood
is around 2% heavier.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

"mscres" wrote in message
...
Anyone can give a quick answer to Plywood Density? Or just average weight
per square foot of .5 in Plywood.
It seems my calculation to by boat weight is wrong.

Thanks in advance

Thanks again,
I will use the 37lb/cf




"Glenn Ashmore" wrote in message
...
Depends on the type of wood. Okoume is about 30 lb/cf Meranti is 37
lb/cf. US marine fir plywood is about 35 lb/cf. In general softwood
plywoods weigh about 5% more than the wood it is made from. Heavier
hardwood plywood is around 2% heavier.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

"mscres" wrote in message
...
Anyone can give a quick answer to Plywood Density? Or just average weight
per square foot of .5 in Plywood.
It seems my calculation to by boat weight is wrong.

Thanks in advance

And take into account that plywood isn't exactly the nominal measurement.

"mscres" wrote in message
...
Anyone can give a quick answer to Plywood Density? Or just average weight
per square foot of .5 in Plywood.
It seems my calculation to by boat weight is wrong.

Thanks in advance

mscres wrote:
Anyone can give a quick answer to Plywood Density? Or just average weight
per square foot of .5 in Plywood.
It seems my calculation to by boat weight is wrong.

Thanks in advance

If you are using locally supplied material all you have to do is take
the bathroom scales down to the lumberyeard and stand a sheet on the
scales on edge. That's what I did when I was desiging the cheap plywood
boats on my website ( www.ncf.ca/~ag384/Boats.htm ). There's some data
and formulae there on bending raduii. I discovered lauan underlayment
weighs the same as 5.22mm okume marine.