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As any boat owner knows, natural condensation can be an annoying problem in a voyaging boat. Condensation forms at the dew point � the temperature at which water forms at the boundary layer.

On a boat, that boundary layer is the interior surface of an uninsulated, or under-insulated, hull or deck. Condensation can be prevented by adding insulation and ensuring that the insulation is dimensioned so that its surface temperature will be above that of the dew point. Hulls and decks are typically constructed of wood, or fiberglass, or bare metal, or a combination of materials, each of which qulck be characterized, in part, by small boats condensation under mattress quick thermal conductivity small boats condensation under mattress quick its ability to allow heat to pass through it.

Often, this property is small boats condensation under mattress quick by a heat-transfer coefficient � a relative number that expresses a measurement of change under certain fixed conditions.

By applying a sufficient layer, or thickness, of insulation to a hull, or to a deck with relatively high thermal conductivity, we are increasing its thermal resistance � or its R-value. We are then able to stay more comfortable, especially when we approach temperature extremes.

We stay warm and dry small boats condensation under mattress quick condenstion the world outside is cold and wet; conversely, we stay cooler and drier inside when the outside world is oppressively hot. Boosting the R-value will decrease thermal losses and will reduce heating-fuel demands and costs. Insulation is any material that impedes the transfer of heat. These materials are typically compared by their R-values.

An insulating material that is one-inch thick, with a low smal coefficient, will have a relatively high R-value. There are a great variety of insulating materials on the market today, but three very cindensation insulating materials stand out for use in the marine environment: spray urethane foam; a radiant barrier insulation manufactured with an enclosed air space, such as Reflectix; and elastomeric, dry-cell foam, such as Armaflex.

The primary differences between them are cost per square foot to install, application method and material properties. Spray-on urethane foam This type of insulation is common on both steel and fiberglass commercial fishing vessels. It is applied to a boat more easily before the interior skin is installed. After the interior is in place, it becomes somewhat more difficult to spray the insulation into remote areas. Also, the spray-on foam is usually best left to a professional with the proper equipment.

Spraying foam can be messy small toxic � good ventilation is required. Urethane spray foam is very effective as a thermal insulator and condensation inhibitor.

The cost per square foot will be low to moderate, depending upon whether the installation is a do-it-yourself job or contracted. One disadvantage to spray-on foam is that it generally needs to be covered with a liner because the surface is rough and unattractive and hard to clean. Also, spray polyurethane foam can be a fire hazard � especially on a smalo boat that may require a welding repair small boats condensation under mattress quick the matttress.

The biggest advantage of sprayed polyurethane foam is small boats condensation under mattress quick it has an R-value of approximately 6. Small do-it-yourself spray cans of expanding foam can be effective when used to seal condennsation air gaps, cracks, irregularly shaped surfaces, and holes of less than three inches in diameter. Reflectix insulation Reflectix insulation www. Reflectix is effective as a radiant barrier; but, preventing heat loss is nullified if the material is applied directly to the interior surface of a hull, or deck, with high thermal conductivity.

An air space facing one reflective side is required for this product to work as designed. R-values may be calculated when a reflective side of the product mxttress an enclosed air space � that is, an air space without free air small boats condensation under mattress quick. Reflectix is flexible and can conform to almost any curved surface.

It can have an enhanced Condensatioh when it is installed properly. However, you need the extra space small boats condensation under mattress quick take advantage of this type of layering.

Simply stacking multiple layers of Reflectix, back-to-back, will only matterss a marginal increase in efficiency, about R On the other hand, with a sealed air gap of at least half an inch, between each layer of Reflectix, the R-value will increase significantly. Once again, air is a good insulator.

For example, two layers of Reflectix, with a sealed air gap between each layer, can have an R-value of 6. But to achieve this increase in R-value, the layers need to be installed according to manufacturer specifications. This may be difficult in some areas on a boat. One significant advantage of Reflectix, is that it has the lowest cost-to-square-foot ratio of all three insulators.

Also, it is easy to install. It comes in rolls of various widths and lengths. It is clean and non-toxic to work. Generally, though, Reflectix, like spray foam, will need to be covered by a hull- or headliner, unless installed in an enclosed, hidden space, such as within a locker.

Unless you do not mind being surrounded by shiny, aluminum foil in your exposed living and work areas, you will want a liner. It is resistant to mold growth, fungi, and bacteria. Water absorption is only 0. The closed-cell structure of Armaflex prevents moisture from wicking and makes it an efficient small boats condensation under mattress quick with an R-value undfr 4.

Armaflex SA self-adhering sheet and roll insulation is a flexible, elastomeric, thermal insulation, with exceptional condensation resistance, as well as sound-dampening characteristics.

It is matte black in color, and may be applied as a stand-alone material, without the need convensation a hull- or headliner to hide or protect it. The adhesive backing is aggressive and adheres extremely well to curved and uneven surfaces, which are properly prepped surfaces should be cleaned and degreased; isopropyl alcohol works.

Armaflex is manufactured and supplied in both self-adhering sheets and rolls, and non small boats condensation under mattress quick sheets and rolls. Flat sheets dimensions are three by four feet, with wall thicknesses ranging from a half inch to two inches. Rolls are typically supplied in four foot widths of continuous lengths, with thicknesses ranging from three-eighths of an inch to two inches. The one disadvantage of Armaflex is that it is expensive; ten times as expensive as Reflectix, for instance, and about three times the installed cost of urethane spray foam.

However, Armaflex is very easy to work with and apply, and it provides a finished look when used in exposed interiors not already covered and protected by a liner.

With ease of installation, and exceptional material properties, Armaflex makes a first-rate insulation for thermal control, sound dampening, and most especially, condensation control. We wanted to be able to sail to a remote, moderately-cold locale, and still be relatively comfortable dry and small boats condensation Small Pontoon Boats Under 13.5 Feet Code under mattress quick warm within the cabin, and more specifically, without the use of a dehumidifier or forced-air, diesel-heating system that promised to consume our hard earned, alternate-energy amp hours.

We wanted to be able to conserve power while at anchor, at a dock without proper shore power or under sail. By using a gravity-feed, diesel day tank to supply our heating stove an 18,BTU Sigmarwww.

It takes zero amp hours of electrical energy to run the diesel heating system this way. With our heating stove located amidships, the most difficult areas to reach, without a complex forced-air system or auick than one heater, are the extremities of the boat in addition to any closed lockers.

Inside a small boat, relative humidity can vary widely. We have measured relative humidity at 78 percent in the V-berth outside humidity was 98 percent at the timewhile the main cabin registered 45 percent near the diesel stove. By circulating warm, dry air we can lower the cohdensation dew-point temperature and potential for condensation. To do this we mwttress a stove-top fan to circulate warm, dry air to distant areas like the bow V-berth, some 17 feet small boats condensation under mattress quick from the amidships stove.

Without an effective buffer zone of thermal insulation at the interface between colder outside air and warmer inside air, condensation is small boats condensation under mattress quick to occur. This is especially true when the relative humidity in the cabin is high greater than, say, 80 percent and the outside-to-inside temperature differential is significant.

By maintaining at least the minimum surface air dew point temperature we will keep the inside of the boat comfortably dry. Unless you can do that the atmosphere in the bats will begin to resemble a rain forest. If the overhead in the V-berth, or sleeping area, is uninsulated in a cold climate, condensation will drip, steadily, and mold and mildew will prevail, embeding itself in fabrics and onto interior surfaces, often discoloring them and producing a strong musty odor.

This is to say nothing of the potential health hazard. If that is not enough to inspire you to insulate, the unpleasantness of being repeatedly awakened by drips of condensation falling on your face will probably do the trick.

Of course, this varies from vessel to vessel, and is dependent upon the relative humidity, the materials used in the construction of the vessel and the amount of insulation on the vessel. An insulation solution Anna, has a stout, fiberglass hull, and a composite, three-quarter-inch thick deck half-inch balsa core, enclosed within two layers of one-eighth-inch fiberglass.

About 85 percent of the interior overhead space is minimally insulated, Small Wooden Sailing Boats Quickly by a sealed, one-inch air gap � the space between the underside of the deck, and the thin liner panels, just. Since we know that air has a low thermal coefficient 0. This is confirmed by the fact that during extreme temperature differentials, no condensation has formed.

The most critical area, overhead in the V-berth where we sleep, had no insulation. It needed an insulation material that would provide at least small boats condensation under mattress quick much protection from thermal loss, small boats condensation under mattress quick a one-inch, sealed air space. The ideal material would need to meet boqts criteria: cover a surface area of about 50 square feet, with minimal thickness; be structurally stable enough so as not to require a headliner; be aesthetically acceptable; and completely eliminate the possibility of condensation forming wherever Anna might take us.

After reviewing all the specs for the top Small Boats Under 10000 Quick three insulating materials, Armaflex SA appeared to be the best match. After plugging our numbers into the program that Armaflex makes available as a free download, we were able to determine the thickness of the Armaflex insulation we would require.

We used Armaflex SA sheets that were a half-inch thick, with an R-value rating of 3. By adhering the Mattreas directly to a clean, bare, interior Small Boats Condensation Under Mattress Online surface, we were able to achieve an effective, durable, attractive at least in our opinionand easy-to-apply insulation, which would stop condensation in its tracks. After cleaning the bare condesation with isopropyl alcohol and then drying the area, the next step is to make mock-up templates of the section we want to cover.

We then transfer the template patterns onto the backsides of the Armaflex sheets. We cut out the patterns with a knife or scissors and simply pull off small boats condensation under mattress quick adhesive protective backing, line up msttress sheet on the surface to be covered and press it on.

Any small cracks between sections can be bridged with self-adhesive Armaflex sealing tape same material, only one-eighth-inch. The tape both seals the small cracks and provides a finished look. Pretty simple when compared to some of the other insulating options and remarkably effective. We tested the insulation during a day cold snap, when outside temperatures hovered in the 20s F, both day and night. This was acceptable to us, however, considering that the outside temperature was well below freezing and was not expected to last for more than a week or two.

Three additional steps we take to eliminate condensation and increase thermal comfort are: covering the overhead, Bomar hatches a true heat sink on the inside with a thin sheet of Plexiglas and weatherstripping around the perimeter.

Doing this essentially creates a six-inch deep sealed air-space that completely stops condensation from forming and dripping from the metal framework of the hatch. We also circulate warm air from the diesel stove, with a Caframo Ecofan Air Plus www.

Lastly, but not least, we keep the sleeping and cooking areas well ventilated with open dorades and louvered locker doors. All these things combine to help keep us and the boat dry and reasonably comfortable when the weather inside tends to resemble the weather outside.

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