Has Anyone Considered Spray Foam ?

[bljones]

you want a LOW expansion foam, unless you are looking to fill huge spaces with minimal material. You also want something that cures quickly- the amateur DIY foams sometimes take 8 hours to cure, and they don't finish expanding until they finish curing. I have used this stuff for years:

Hilti Online - CF 812 Window and Door Pro Low-Pressure Filler Foam

[beau]

Aluminium boats are often treated with spray foam, but I would be concerned about spraying the interior of a steel boat. Steel boat tend to rust from the inside out. So monitoring and inspection is critical

[Matt sachs]

Boat Ship and Pontoon Foam Insulation

This is the stuff I was talking about. Its tack free in about a minute. I'm only going to use it above the water line, and on top of two coats of two part epoxy paint. (at least thats what I think I'm going to do, ,,,,,Still trying to learn the best way to do things)

[bljones]

that pontoon foam confuses me- if it 'slow rise", how can it be tack free in less than 2 minutes. Hefty cost as well.

[anjou]

All good stuff and guaranteed to fit everywhere it touches. Cant beat it.

[Boracay]

The PO fitted panels of 1" polystyrene foam all over the interior of Boracay. Unfortunately that's where he stopped.

I was a bit worried about the fire hazard from polystyrene but it's no worse than polyurethane and it essentially has the the same chemical composition as fibreglass resin.

The stuff works well and is cheap. Can be glued in place with contact cement.

I cut back mine along the stringers, chine bars and frames so I could see what's going on.

I've fitted out the interior of Boracay by bolting pine battens to the stringers and screwing plywood on top. 7mm headliner and paneling, 12mm if there's any load.

It's a slow, labour intensive way to fit out a boat, but I can't think of a better way.

[Matt sachs]

Originally Posted by Boracay

The PO fitted panels of 1" polystyrene foam all over the interior of Boracay. Unfortunately that's where he stopped.

I was a bit worried about the fire hazard from polystyrene but it's no worse than polyurethane and it essentially has the the same chemical composition as fibreglass resin.

The stuff works well and is cheap. Can be glued in place with contact cement.

I cut back mine along the stringers, chine bars and frames so I could see what's going on.

I've fitted out the interior of Boracay by bolting pine battens to the stringers and screwing plywood on top. 7mm headliner and paneling, 12mm if there's any load.

It's a slow, labour intensive way to fit out a boat, but I can't think of a better way.

Mine is a hard chine hull, so the flat surfaces would be easy to glue the panels to.......Nice:-) And I can do it in cold weather, instead of waiting until it warms up. If I held it away from the stringers about an inch or so for inspections, that would be better than covering up the trouble areas.
I love this forum. Thank you.

[gtmopat1]

I have used Foam it Green (www. sprayfoamdirect. com)
as additional insulation surrounding an installed and already insulated icebox as well as noise and thermal attenuation. This is closed-cell Polyurethane foam. Seems to work fairly well and produces expected results. I use the 12sq foot kit but if you were doing your whole boat it would be much cheaper to go for one of their larger kits. I am on my third kit at this time. Easy to use and apply, dries quickly, easily shaped if required. They also have a slow rise version which would probably be better for areas you cannot see.
Pat B
s/v Marguerite