Installing 3/4 in. casting deck

D

dano1215

Cadet
Joined
Jul 14, 2011
Messages
8
Hi everyone,
I have a 16'6" ft. sea nymph. I have removed the center bench and have ran aluminum stringers for the flooring supports and structural stength.My question is about building a front casting deck using the 2 front bench seats as support.Iam using 3/4 in. on all.Should I also use stringers between the 2 seats or will 3/4 in. plywood be sufficient.Iam really starting to worry about wieght.I have a 25 hp. that is going on it. Any input will be helpful.

Thank you
 
kfa4303

kfa4303

Banned
Joined
Sep 17, 2010
Messages
6,094
Re: Installing 3/4 in. casting deck

Hi dano. You'll probably be fine without adding extra supports, but if you're worried you can fab some out of 2" x 2" stock and/or 1/8" aluminum angle. Make sure you only use NON-Pressure Treated wood, then seal it with epoxy, oil based exterior paint, or spar urethane and attach it to the hull using stainless steel hardware dipped in a bit of 3M 5200 marine caulk. You can get everything you need at lowes/HD.
 
jigngrub

jigngrub

Fleet Admiral
Joined
Mar 19, 2011
Messages
8,155
Re: Installing 3/4 in. casting deck

Non treated 3/4" plywood weighs approx. 75 lbs. per 4'x8' sheet, pine might be a little heavier and fir will be a little lighter.
 
Watermann

Watermann

Starmada Splash of the Year 2014
Joined
Jan 12, 2013
Messages
13,753
Re: Installing 3/4 in. casting deck

You should be good with the 3/4" ply as long as your not cutting out hatches in it. If you can find it, get some marine ply, it has 7 layers and is very strong compared to the standard 4 ply AT. I would cut it to fit and then stand on it first before screwing it down. If it sags, creaks or seems weak then I would just use some of the remaining sheet to make an "I" beam to support underneath the center of the span.
 
73Chrysler105

73Chrysler105

Chief Petty Officer
Joined
Sep 10, 2009
Messages
407
Re: Installing 3/4 in. casting deck

The Auruco plywood at Home Depot is also 7 layers and exterior glue is used and 1/3 the cost of Marine Plywood.
 
kfa4303

kfa4303

Banned
Joined
Sep 17, 2010
Messages
6,094
Re: Installing 3/4 in. casting deck

+1. Aurco is good stuff if you can get it. As a matter of fact, you can get just about everything except the epoxy from HD. Gotta love those tinnies ;)
 
You must log in or register to reply here.
Top