Boat Building Forum

Find advice on all aspects of building your own kayak, canoe or any lightweight boats

Comments on Your Solution
By:Jon K.
Date: 9/15/1998, 10:49 pm
In Response To: Re: Venting A Sealed Compartment - MY SOLUTION (Jim Ward)

Windsurfing boards are made with expanded polystyrene because it has a density of only 1.0 lb/cuft. Closed cell polystyrene, such as the floatation and fabrication billet, has a density of 2.0-2.5 lbs/cuft.

I would strongly urge you not to fill your forward compartment with two part urethane. The grades of this foam commonly available are not dimentionally stable with time and temperature. In my experience it will continue to change shape over the years and may distort your boat along with it. If you must use it, use the more expensive higher temp grades that are more stable.

The foam can generate huge expansion pressures if you mix too much for the volume to be filled. Actually though, I don't think you will have a problem with this if you do the operation in several pours and if your deck is off.

Calculate the weight that you will be adding to your boat. You may not be happy with the answer.

I think it a far simpler solution to just add a small screw-in or snap-in plastic hatch to your front bulkhead. Make a tool to remove it if you can't reach. You'll probably only have to take it off for winter storage and after paddling sessions when you get lots of water in the cockpit.

Messages In This Thread

Venting A Sealed Compartment
Jim Ward -- 9/15/1998, 4:16 pm
Everyone wants to vent
Paul Jacobson -- 9/18/1998, 4:19 am
Re: Everyone wants to vent
Rick VanBuren -- 9/18/1998, 4:38 pm
vent and w(h)ine
Paul Jacobson -- 9/19/1998, 9:26 pm
Re: Everyone wants to vent
Mike Spence -- 9/18/1998, 3:14 pm
Re: Venting - it's not a problem
Jay Babina -- 9/17/1998, 10:06 am
Re: Venting A Sealed Compartment
Pat Pavlik -- 9/16/1998, 10:56 pm
Re: Venting A Sealed Compartment
Mark Kanzler -- 9/16/1998, 4:02 pm
Re: Venting A Sealed Compartment
Jon K. -- 9/15/1998, 7:40 pm
Re: Venting A Sealed Compartment - MY SOLUTION
Jim Ward -- 9/15/1998, 8:59 pm
Re: Venting A Sealed Compartment - MY SOLUTION
Mark Kanzler -- 9/16/1998, 11:35 am
Re: Venting A Sealed Compartment - MY SOLUTION
Nolan Penney -- 9/16/1998, 8:45 am
Re: Venting A Sealed Compartment - MY SOLUTION
Scotty -- 9/16/1998, 11:28 am
Comments on Your Solution
Jon K. -- 9/15/1998, 10:49 pm
Re: No Foam. Inspection Port In Bulkhead
Jim Ward -- 9/16/1998, 10:28 pm
Re: No Foam. Inspection Port In Bulkhead
Mark Kanzler -- 9/18/1998, 5:35 pm
Re: No Foam. Inspection Port In Bulkhead
Mark Kanzler -- 9/18/1998, 5:55 pm
Re: No Foam. Inspection Port In Bulkhead
Nick Schade -- 9/17/1998, 5:01 pm
Re: PVC pipe fittings
Nolan Penney -- 9/17/1998, 8:01 am
Re: No Foam. Inspection Port In Bulkhead
Mike Spence -- 9/17/1998, 12:50 pm
Re: No Foam. Inspection Port In Bulkhead
Rick VanBuren -- 9/17/1998, 4:17 pm
Re: No Foam. Inspection Port In Bulkhead
Pat Pavlik -- 9/16/1998, 11:56 pm
Flexible inspection plate
Mike Spence -- 9/17/1998, 12:17 pm
Re: Venting A Sealed Compartment
L.C. -- 9/15/1998, 7:26 pm
Re: Venting A Sealed Compartment
Mark Kanzler -- 9/15/1998, 5:46 pm
Re: Venting A Sealed Compartment
Mark Carroll -- 9/15/1998, 4:46 pm
Re: Venting A Sealed Compartment
Jim Ward -- 9/15/1998, 5:23 pm
Re: Venting A Sealed Compartment
Ross Leidy -- 9/15/1998, 4:34 pm
Re: Venting A Sealed Compartment
Martin Foil -- 9/16/1998, 3:10 pm
run a vent tube
Brian C. -- 9/15/1998, 5:30 pm
Re: run a vent tube
Jim Ward -- 9/15/1998, 6:19 pm
Re: run a vent tube
Rick C. -- 9/17/1998, 10:15 pm
Re: run a vent tube
Mark Kanzler -- 9/18/1998, 6:42 pm
Re: Gas mask valve
Mike Spence -- 9/18/1998, 3:01 am
Re: Gas mask valve
Mark Kanzler -- 9/18/1998, 6:55 pm
Re: Gas mask valve
Nolan Penney -- 9/18/1998, 7:01 am
Re: Gas mask valve
Mark Kanzler -- 9/18/1998, 7:03 pm
Re: Tandem valve....
Tor-Henrik Furmyr -- 9/19/1998, 6:42 pm
Re: Tandem valve....
Mark Kanzler -- 9/20/1998, 1:06 am
valveless `valve'
Paul Jacobson -- 9/19/1998, 8:44 pm
Re: Gas mask valve
Rick C. -- 9/18/1998, 2:28 pm
Re: Venting A Sealed Compartment
Jim Ward -- 9/15/1998, 5:28 pm
Re: Idea #2
Nick Schade -- 9/16/1998, 5:57 pm
Re: Venting A Sealed Compartment
Nick Schade -- 9/16/1998, 5:44 pm
Re: Venting A Sealed Compartment
Ross Leidy -- 9/15/1998, 5:52 pm