Insulating is interesting. What exactly are you doing there?
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i am using half inch thick armaflex to insulate the hull from the deck right down to within a foot of the bottom of the boat. armaflex is waterproof, mildew and mold resistant, an incredible insulator and, very dense. it is the same black insulating material that is often used around refrigerant lines. it also comes in sheets.
we used to use it to insulate large air conditioning systems (for cooling computer rooms) at a job i used to work. i still am friends with a lady who still works there. there is plenty of large scrap because they use it to cover the tables in order to keep from scratching freshly powder coated panels, as well as an insulator.
my cost? nothing. usual cost? between 7 and 8 dollars a square foot. it's good to keep old friendships alive. you never know when it will work out to your advantage.
anyhow, you apply it with a 3m spray adhesive (although armaflex also has their own glue). the material is totally flexible yet very dense. so dense that i don't have to epoxy wooden stringers on the hull every few feet to be able to attach the paneling over the insulation. i just spray glue it right on. it makes a very solid surface.
the paneling i am using is totally synthetic. it's a flooring product that comes in 1/8" thick strips, 4" wide, like boards. it's already self adhesive but the 3m spray glue is stronger so i use that. for trim i am using pvc composite molding. looks like wood. easy care like plastic. all of it water proof and mold and mildew resistant.
for the 'ceilings' i am using 1/4" self adhesive armaflex and while vinyl sheets.
the v berth is all wood design sides with the white ceiling. the rest of the interior, back to the quarter berths, i am doing in a chair rail design; with wood up to the hull/deck joint, white molding at he top of that (the chair rail) and white vinyl above the molding.
the quarter berths are wood design sides and white ceilings, like the v berth. i am not finished yet (the insulation doesn't take long to do, really, but, the planking is very time consuming). however, the interior is already much easier to keep comfy cozy and, as i have added natural ventilation under the v berth and all the interior 'furniture (to allow circulation of warm air), moisture from the cold outside has dropped to absolutely nil. my bedding is never damp or clammy.
when i get some pics taken, i will post them.
previously, only the companionway hatch was insulated with it. last winter, snow melted from the entire boat because of heat loss from the warmth inside...except that hatch. it never melted free until it warmed up outside. it can be 0 degrees outside but, if you touch the armaflex inside, you won't feel a bit of the cold.
it should make a nice difference this summer, too.