Aloha… so lets see clark foam blanks are 3lbs. per sq. ft. at the high end of the estimate . and expanded or extruded foam is 2 pounds roughly … So an 8ft. board 23 wide and 3 thick is 4 sq.ft. ?? roughly as it is not 3in. thick or 23 wide all over … Soooo 4sq. ft. x 3lbs. clark =12 lbs. AND 4sq. ft. x 2lbs. xps or eps foam = 8lbs??? Right?? So the differencs is 4 lbs at the most . I know that epoxy boards are a lot lighter. Is the rest of the difference in the glass??? Or am I missing something? I know their a lot lighter and stronger I have 1 and want another one but am just amazed and perplexed where the weight goes… Thanks…
Pretty close but it is lbs/CUBIC ft not sq. ft.
Excuuuuuse Me … Ha!! for being so dumb … of course its CUBIC foot . But what about the rest ? Is there that much weight savings in the glass …Aloha
The way I look at it is this: The lightest reasonable foam is 1 lb density EPS Next is 1.5 EPS. There is also extruded (XPS) in this range Then there is 2.0 lb. EPS and dow blue extruded (XPS) in that range Then there is Clark Ultra 2.35lb. Then Clark Superlight 2.60 Then blue 2.85 Then green 3.05 And Walker has foam in this range as well Clark old superlight ? Clark light ? and regular ? Then Balsa which varies and can be chambered After that there are numerous wood spiecies that all have their own densities starting with soft woods like cedar and redwood and going all the way to oak. Pick whatever density is going to give you charateristics you want to feel in the finished board. Really light, EPS. Middle of the road, uretane. Towing in or kiteing, maybe balsa or another wood. Or a mixture of each. Laminate any and all with the best quality resins you can get, ones that work on any core (epoxy).