Hi sorry cant help you with this but interested if you've looked into this.  looking at doing this myself but really wanted to know about corrosion as the foam absorbs and holds water.    

 Hi Joshua , retro fitting sheet foam to a platey is complex and very time consuming if the deck hasnt been designed with soft patches. It is advantageous to have soft patches running the length of the deck at approx 450 wide to enable fitment. The correct way to fit sheet foam is transverse and vertical on top of the stringers, gving 50mm airgap between hull and foam. The best way is, each piece is cut and shaped from bow to stern out of 50mm thick sheet epe or microlene using a hand saw. This foam is fire resistant, petrol resistant and 100% waterproof, especially the microlene. If you want any more info or I can give you some contact numbers for foam. Not a foam fitter but just done the same thing on my boat. 

 try G T fibreglass. they did my boat and they may be able to do ali. can only try. 0411597895 guys name is Greg

 hey guys thanks heap for the info, faulks whats the damage$$ on yours?  my boats 26ft. also any improvements in ride?

thanks brine59 im not gunna be able to cut sheets due to holes to fit foam through are small, im thinking at worst pool noodles wrapped in some plastic sheet. do you notice any ride differences in your boat now it complete?

 hey guys thanks heap for the info, faulks whats the damage$$ on yours?  my boats 26ft. also any improvements in ride?

thanks brine59 im not gunna be able to cut sheets due to holes to fit foam through are small, im thinking at worst pool noodles wrapped in some plastic sheet. do you notice any ride differences in your boat now it complete?

Hi Joshua,what vintage and breed is your hull? Some earlier jackmans had welded frames, I foamed a 98 jackman by removing the fuel tank and inserting all the foam through the frames, using a stick with a nail in the end of it. Faling having an entry though the frames the only other option is to possibly use liquid foam in bags. The main problem with this method is moisture entrapment between the bag and the hull eg corrosion issues. Its a well used method in commercial circles for buoyancy, noise reduction and as a stiffner. This liquid foam is generally yellow or green and is fire resistant and fuel stable. Finding someone who can do this job might be the hardest part, but it is the best for noise reduction. In a boat of your size you're probably looking at a minimum of 2.5 cubic metres for floatation.

Hi Joshua,what vintage and breed is your hull? Some earlier jackmans had welded frames, I foamed a 98 jackman by removing the fuel tank and inserting all the foam through the frames, using a stick with a nail in the end of it. Faling having an entry though the frames the only other option is to possibly use liquid foam in bags. The main problem with this method is moisture entrapment between the bag and the hull eg corrosion issues. Its a well used method in commercial circles for buoyancy, noise reduction and as a stiffner. This liquid foam is generally yellow or green and is fire resistant and fuel stable. Finding someone who can do this job might be the hardest part, but it is the best for noise reduction. In a boat of your size you're probably looking at a minimum of 2.5 cubic metres for floatation.

hey

curious what you mean by change the ride? The only way to change the ride is to make the hull lighter or heavier, so are you taking about the extra weight of the foam altering the ride? This is the only way the ride could change. It’s impossible for foam to make the boat ride any higher in the water (lighter)  since the foam will be heavier than the air that it is replacing in the hull. 

 Brine 59, gday mate thanks for such a detailed reply, my boat is a 7.5m jackman made buy oceanic fabrication. Im planing on getting a new fuel tanks made which will give me access to the internal framework. What sort of foam did you use (sheet? Brand?) and do you need to separate it from making contact with the hull or just push it all in?

As for your question CD my boat rides well but id like to reduce some of the noise in the front end when I hit a wave. I understand ali boats have this as a norm but if I could reduce some of the noise buy filling the bow area particularly with some foam I think this would help dramatically.  

 Hi Joshua,I have checked in with Bruce from oceanic fab [my latest boat builder] and he said its age dependant on frame type.His son Aris said they would be happy to build new tanks and talk about foam options.they have a foam supplier in Yangebup who usually has both white and black foam at a good price.Iused both epe and microlene and the black microlene is the best ,but supply is sometimes limited.Separating your sheet from the bottom plate is very important.I stacked triangular shaped 50 mm thick sheet vertically on each side of the hull on top of the 50mm x 6mm stringers creating an air gap.Vertically stacked sheet is jammed between deck joists and stringers and frames so it cant move.This method allows condensation to drain ,but access is paramount ,so you may have to create it. This is not that hard for those in the know and you can have soft patch access for periodic hull checks or just weld it back up. The foam is fire retardant.  Specialty Foams pty ltd 94181100.Good luck with your project ,I know my new 6.8 is quieter and I also whats going on below deck.

thanks mate appreciate that info any chance I could get that guys number, im hoping to get a few quotes in the next coupler weeks.

,Howdy joshua,the number is 08 64989911 oceanic fabrication in henderson.They are pretty flexible on your level of work input if you have a few skills.