Decking a Pontoonboat
- cyberbadger
- Full Steam Ahead
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- Boat Name: SL Nyitra
- Location: Northeast Ohio, USA
Decking a Pontoonboat
Hi,
I'm coming to the point were I am ripping up the carpet and plywood deck(Rotted) on the Nyitra.
1) Is Treated plywood Ok for Aluminum Pontoon-boat decking? (It's should never be submerged, just splashes.)
2) Any recommendation on reinforcing the area for the boiler. I was planning on having angle iron reinforcing running through like an X or Asterisk * to the aluminum support members that connect the pontoons to the deck(plywood). Can I get buy with just framing that in wood without metal reinforcement?
The unknown quantities unfortunately are the Nyitras boiler weight and the costquard capacity plate(faded). The best estimate I have is 900-1200 American pounds dry weight. I don't have the ability(scale) to weigh it right now.
3) Anything I should watch for, suggestions? (I am considering adding a third pontoon)
-CB
I'm coming to the point were I am ripping up the carpet and plywood deck(Rotted) on the Nyitra.
1) Is Treated plywood Ok for Aluminum Pontoon-boat decking? (It's should never be submerged, just splashes.)
2) Any recommendation on reinforcing the area for the boiler. I was planning on having angle iron reinforcing running through like an X or Asterisk * to the aluminum support members that connect the pontoons to the deck(plywood). Can I get buy with just framing that in wood without metal reinforcement?
The unknown quantities unfortunately are the Nyitras boiler weight and the costquard capacity plate(faded). The best estimate I have is 900-1200 American pounds dry weight. I don't have the ability(scale) to weigh it right now.
3) Anything I should watch for, suggestions? (I am considering adding a third pontoon)
-CB
- barts
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Re: Decking a Pontoonboat
How big are the pontoons (length, diameter)? Stability w/ VFT boiler?
Don't use treated plywood against aluminum; the metals in the plywood will interact poorly w/ aluminum.
http://www.donan.com/knowledge-base/art ... ood-decks/
- Bart
Don't use treated plywood against aluminum; the metals in the plywood will interact poorly w/ aluminum.
http://www.donan.com/knowledge-base/art ... ood-decks/
- Bart
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Bart Smaalders http://smaalders.net/barts Lopez Island, WA
Bart Smaalders http://smaalders.net/barts Lopez Island, WA
- cyberbadger
- Full Steam Ahead
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- Joined: Thu Nov 07, 2013 9:16 pm
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- Location: Northeast Ohio, USA
Re: Decking a Pontoonboat
They are 24 foot 6 inches in lenght, 19 inches in diameter. They taper at the front to something like a point.barts wrote:How big are the pontoons (length, diameter)?
Not tried, not calculated. I'm going to put it on the deck, above the center of the point of gravity. I was going to float it on my friends pond where a tractor would be available for rescue, to test for buoyancy and balance.barts wrote:Stability w/ VFT boiler?
Good to know. Hmm...barts wrote:Don't use treated plywood against aluminum; the metals in the plywood will interact poorly w/ aluminum.
-CB
- barts
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Re: Decking a Pontoonboat
So, your hulls displace 96 cubic feet in total.
http://www.tc.gc.ca/publications/en/tp1 ... p1332e.pdf
suggests that the carrying capacity of a pontoon vessel is
given by (volume * density of water - weight of vessel)/2
So
(96 cubic feet * 62.4 lbs/cubic foot - weight of (vessel, engine,boiler)/2
So if all the stuff you add to the boat (tanks, engine, boiler, etc) weighs
2000 lbs, the capacity of the boat will be 2000 lbs...
there are also stability calcs in there....
- Bart
http://www.tc.gc.ca/publications/en/tp1 ... p1332e.pdf
suggests that the carrying capacity of a pontoon vessel is
given by (volume * density of water - weight of vessel)/2
So
(96 cubic feet * 62.4 lbs/cubic foot - weight of (vessel, engine,boiler)/2
So if all the stuff you add to the boat (tanks, engine, boiler, etc) weighs
2000 lbs, the capacity of the boat will be 2000 lbs...
there are also stability calcs in there....
- Bart
-------
Bart Smaalders http://smaalders.net/barts Lopez Island, WA
Bart Smaalders http://smaalders.net/barts Lopez Island, WA
- cyberbadger
- Full Steam Ahead
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- Joined: Thu Nov 07, 2013 9:16 pm
- Boat Name: SL Nyitra
- Location: Northeast Ohio, USA
Re: Decking a Pontoonboat
That 3rd pontoon is starting to look mighty appealing.barts wrote: So if all the stuff you add to the boat (tanks, engine, boiler, etc) weighs
2000 lbs, the capacity of the boat will be 2000 lbs...
Back to Decking, if I shouldn't use pressure treated, can I use any plywood other then marine plywood? (Like anything from Home Depot/Lowes)
I plan on painting it.
-CB
- fredrosse
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Re: Decking a Pontoonboat
You can use 3/4 fir exterior plywood, exterior rated. But it will check with just paint. You definately need to seal the edges with epoxy or vinyl resin. For real long life fiberglass cloth over plywood, with vinyl resin(cheaper, not as good) or epoxy resin (expensive)
I made a new transom for a fiberglass sailboat with 2 layers of 3/8 exterior fir (wanted to make a curved transom, hence two layers, & glue together while bent) , covered with 10oz fiberglass cloth and vinyl resin, holding up perfect after 5 years now.
I made a new transom for a fiberglass sailboat with 2 layers of 3/8 exterior fir (wanted to make a curved transom, hence two layers, & glue together while bent) , covered with 10oz fiberglass cloth and vinyl resin, holding up perfect after 5 years now.
- fredrosse
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Re: Decking a Pontoonboat
19 inch diameter = 1.97 square feet x 24 feet long = 47 cubic feet x 62 lb/ft3 = 2930 pounds bouyancy for one pontoon fully submerged, or two pontoons each half submerged.
Should not exceed pontoons half submerged, so 2930 pounds total weight. A rough guess at steam plant, 600 to 900 pounds. 4 people = 750 pounds with lunch and refreshments, So how much does the hull weigh?
Fron the looks of the waterline stains on the photo, it looks like the pontoons are nearly half submerged when floating in its current condition without the steam plant?
Should not exceed pontoons half submerged, so 2930 pounds total weight. A rough guess at steam plant, 600 to 900 pounds. 4 people = 750 pounds with lunch and refreshments, So how much does the hull weigh?
Fron the looks of the waterline stains on the photo, it looks like the pontoons are nearly half submerged when floating in its current condition without the steam plant?
- cyberbadger
- Full Steam Ahead
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Re: Decking a Pontoonboat
24 ft 1985 FD2400 Riviera Cruiser ... 1260 lbs
http://www.nadaguides.com/Boats/1985/Riviera-Cruiser
Some of the couches didn't come with, and the 2 stroke (These hydrocarbon engines, can't even get power every stroke - it's uncivilized!) engine is obviously not staying.
Never floated it myself. The owner said he had had 10 adults onboard without much trouble.
-CB
http://www.nadaguides.com/Boats/1985/Riviera-Cruiser
Some of the couches didn't come with, and the 2 stroke (These hydrocarbon engines, can't even get power every stroke - it's uncivilized!) engine is obviously not staying.
Never floated it myself. The owner said he had had 10 adults onboard without much trouble.
-CB
Re: Decking a Pontoonboat
Have you considered welding up a framing structure and putting a "diamond plate" aluminum deck on top of that? Fast, efficient, and probably lighter than plywood without the rot and delamination issues. And... it will never need paint.
- cyberbadger
- Full Steam Ahead
- Posts: 1123
- Joined: Thu Nov 07, 2013 9:16 pm
- Boat Name: SL Nyitra
- Location: Northeast Ohio, USA
Re: Decking a Pontoonboat
It would be nice. A cursory search online shows that is way out of my budget. Lot of square feet, 160 sq ft. (Currently 5 8 ft x 4 ft plywood)Bob Cleek wrote:Have you considered welding up a framing structure and putting a "diamond plate" aluminum deck on top of that? Fast, efficient, and probably lighter than plywood without the rot and delamination issues. And... it will never need paint.
-CB