VIC
8025 posts
Some of the boards such as the Surftech Tuflite construction are multi layered, but if you manage to get through all the layers I think they can suck water.
My basic understanding of EPS (expanded poly) is that each bubble of foam won't suck water, but there are air gaps in between which effectively suck.
Maybe someone can tell us more, or knows more about the densities and if higher density foam sucks less water / has less air gaps... ????
QLD
2039 posts
Simondo is correct, the foam itself wont take on water but the air in eps will allow water to enter the board and will generally trap it there. The air space in a 120lt board can be in excess of 30lt... so possibly 30kg of water weight.
The problem is that once water gets in it is very hard to extract, and over time the water destroys the EPS foam core. It's not uncommon to see water enter through incorrect use of the screw vent. A hot board hitting cold water with any sort of hole, be it screw vent or through damage will suck water very fast.
Want to know more check out the board lady web site, she has a lot of info - albeit it for windsurfers, but they did pioneer the construction used in mass produced SUP's, so it is pretty much the same.
NSW
1610 posts
all sup will suck water really really badly if you get a hole in them and in the water get out quick. I am good friends with a local ding repiarer and he currently has 4 delaminated boards to fix from water loggage and leaving in the sun etc all are big well known brands so be aware and look after your board well.
QLD
177 posts
Polyurethane foam PU (most shortboard stuff) will not absorb water but Expanded Polystyrene EPS does. What is your board made of johnnygun ? The most effective way i have seen to remove it from EPS is to drill crude holes at the tail and stand it vertically for some time and slowly drain it , of course capillary action tries to keep it where it is and gravity is trying to get it out. IMO you will never get it all out. good luck Lats
