The interior shell

Conditions to the interior construction

Building the interior of a wood boat, fiberglass boat or metal boat takes different approaches. The particularities of building the accommodations of a steel boat are that not only you can’t screw into the metal but its also best to not attach directly to the metal.
As it was said on the insulation page, condensation is the battle of a metal boat; therefore we need to avoid any “thermo-bridge”.
A bolt going through a rib and sticking up in the ambient air would be colder then the ambient air and cause condensation.
Fasteners withing the insulation layers is not as much of an issue but I wanted to avoid having to drill and bolt through steel; its a hassle.
T frames are aslo a little more of a pain to deal with then flat frames as its not as strait forward as sistering them with wood.

I also wanted to limit my need of forward thinking regarding the construction of the interior accomodations, hence not relying of strategically positioned structures.

So, I didnt want to use fasteners (or as little as possible) and I didnt want to rely on the position of my wood members.

The solution was to have an interior plywood shell to which I could fasten the interior accommodations and to rely on adhesives to secure that “interior shell”

I did set myself one other condition to the construction of my interior. Like the rest of the boat, and even more so then on deck, I want it to feel like a wooden boat.

A picture is worth a thousand words


The strip of plywood under the rib’s flange is glued with polyurethane, but the stability of the whole interior structures wont rely so much on the glue.

The top of the flanges is covered with a 1/4 inch band of armacell.


Holding the plywood strips while gluing

The “knee” structures where a lot of work because of all the compound angles but add a lot to the looks of the boat an maintaining an access behind them will facilitate running power.


All visible surfaces is grooved plywood to give an illusion of planks.

The shell is made of 3/8 plywood. For most it will be on the inside of cupboards or bunk structures. The rest will be finished accordingly but all will be painted. The seams are taped with epoxy and fiberglass; this whole “shell” makes a second vapor barrier, adding to the insulation. The vertical seems are covered with a strip of 1/4 plywood, adding to the wood boat look with apparent wood ribs.






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