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Velcro might work well for this. Won't rust, and wrapped around the extinguisher bottle near the top and bottom should be really secure, but accessible.

 

You won't get around drilling a hole in the wood. Velcro strips need to be attached to something, and the industrial strength strips with removable backing are not up to the task of holding an extinguisher in place in heavy seas. The link from @SanderO works on land, but not at sea. Ask me how I know... I ended up drilling holes.

 

Gives me the creeps every time I need to drill into my boat. I'm mounting an anchor windlass right now and have to drill for the windlass, the two switches for it, etc.. Anxiety! But, wutcha gonna do?

One of my fire extinguishers is mounted in my cockpit lazarette, and the other is mounted under my nav station where it's inconspicuous. BUT...I see nothing wrong (and maybe something right) with an extinguisher being proudly and prominently mounted in the main saloon like a bit of boat bling. Drill baby, drill.

 

3M makes some double sided take that is incredible. I have no doubt that a couple of pieces will hold your extinguishers for many years.

 

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Interesting. I never thought to use this, although I use it around the house plenty and it always gives a very reliable hold. The back of the fire extinguisher mount is not a flat surface, so may drill the mount into a small piece of wood with dimensions similar to the mount, and then use this to fasten the wood to the vessel. Thanks for the idea.

 

Didn’t think anything other than mounting brackets were up to code in the USA?

 

I thought so too but saw this on the USCG FAQ: Fire Extinguishers Requirements for the Recreational Boater FAQ

Q14. I bought a fire extinguisher and in the box is a plastic mounting bracket. The label on the fire extinguisher bottle says it is valid only with bracket. Do I need to mount the fire extinguisher using this bracket?
A14. It is highly recommended to mount the fire extinguisher, but it is not a requirement to mount the fire extinguisher. All portable extinguishers must be readily accessible.

 

Do not mount extinguisher next to stove or flammable source.
Mount one fire extinguisher in a cockpit locker outside the cabin.
If the fire is below and the extinguisher is below it is useless..

Location of second extinguisher should be near a companionway so it can be accessed from inside or outside the cabin.
If mounted high and not in an area prone to spray, rust should not be a problem.
Solidly mounted with screws is the best long term solution.
If you use super strong double sided tape, what do you think is going to happen to the wood panel when you remove the tape?

Store outboard gasoline and propane correctly. Once they start to burn it is all over.
Two small extinguishers will probably not handle the job.

gary

 

Be careful of the double-sided tape or velcro. In very hot weather the inside of a boat can get very hot (110 degrees +) and the adhesive can easily fail. Even the really super, never let go, adhesives. What I would suggest is glueing a 1/2” backboard to the wood surface using an expoxy (this does not fail) and then screwing the mounts into that.

 

Gary's post has helpful advice. Many years ago I checked with a couple of surveyors and a firefighter when upgrading our 34 footer. We have two 2.5" smaller extinguishers, one in a bracket under a seat hatch in the cockpit, and one mounted low on a bulkhead in the head compartment. One 5# in the forepeak sleeping area, and one 5# in the aft cabin, reachable from the galley area. The idea is avoid being trapped in any area by smoke or flames, and having an opportunity to "fight your way out" and/or attack the fire.

Our boat also has the OEM Halon automatic discharge system in the engine compartment and the lighted indicator to show if that bottle has been activated. We have kept this system certified; nowadays they withdraw the halon, weigh it, and refill the extinguisher... and tag it again... and charge me several $.


Like having multiple ways to dewater a boat, you should have ample means to fight a fire.
My spouse and I have both taken a half day fire education and active extinguisher practice session at a local (airport) training facility. This was arranged for group up to 25 or 30 at a time, by our YC. Everyone (!) got to correctly attack and extinguish a live (propane fueled) fire with a dry powder extinguisher. Nervous Fun, it was....
(Really makes you aware of how vulnerable you would be on board a boat with a... fire.)

FWIW, we have found that local fire fighters are eager to train the boating public and help to keep them safe; they much prefer training boaters over having to try to save them.

One other thing to reiterate again, as the saying goes: you will be amazed at how short a time the contents of an extinguisher will last! After that demo, you will no longer be content with having only the minimum number of them on board!

Back to the question: we have teak (ply) bulkheads, about a half inch thick. I drill a screw hole for a thru attachment, and add a small piece of trim on the other side to cover the nut, or put an ss crown nut on an ss washer to dress up the fastening.