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Insulating a fiberglass boat is a complex task that requires careful consideration of the materials used and the specific needs of the boat. The process can vary depending on factors such as the climate, the presence of drafts or condensation, and the desired level of comfort and functionality. While some boat owners opt for spray-in foam insulation, others prefer to use sheets of foam insulation or natural cork. Armaflex, a closed-cell foam, is a popular choice due to its ease of application, availability, and reasonable price. However, it is important to consider the thickness of the insulation, as thicker materials like Armaflex, cork, Glava, or Rockwool will provide better insulation than thinner options. Additionally, proper sealing is crucial to prevent condensation and ensure the effectiveness of the insulation.
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What You'll Learn
Insulation materials: Armaflex, cork, foam, and more
When it comes to insulating a fibreglass boat, there are several materials to consider, each with its own unique advantages. Armaflex, cork, and foam are some of the popular choices, and each has distinct characteristics that make them suitable for boat insulation.
Armaflex, a product by Armacell, is a well-known option in the world of boat insulation. Armaflex boasts a long history, with the company setting high insulation standards for over 70 years. Armaflex is a closed-cell material, known for its flexibility and lightweight nature. Armacell also offers a range of other insulation solutions, such as ArmaGel, which is an aerogel-based insulation technology, and ArmaComp, which provides lightweight foam components.
Cork is another excellent choice for insulating a fibreglass boat. It offers remarkable sound deadening qualities, along with thermal insulation benefits. One user reported successfully insulating their boat with 1/4" acoustical cork, which also improved the aesthetics of their boat. Cork can be applied in various thicknesses, and construction adhesive is typically used for installation.
Expanding marine flotation foam, such as the 2-part polyurethane variety, is also commonly used for boat insulation. This type of foam provides both thermal and soundproofing qualities, making it ideal for multiple applications. The closed-cell structure of this foam allows it to maintain buoyant pressure, even after prolonged exposure to water. It expands quickly, curing into shape with minimal shrinkage and resisting mould and mildew.
Other insulation materials to consider include ArmaPET Eco, which combines insulation with structural integrity for long-lasting energy and emission efficiency, and ArmaSound, which is a noise control system designed to minimise the risk of corrosion under insulation.
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Reducing condensation
There are several ways to reduce condensation in a boat. Firstly, it is important to minimise the amount of water vapour in the boat. This can be done by airing out the boat, circulating the air, and using dry heat. Cooking, drying clothes, and breathing can all add moisture to the air, so it is important to ensure these activities are done with adequate ventilation. Cockpit tents can be useful for this, as they allow you to keep the top hatch open when cooking, and to dry clothes outside while still being protected from the rain.
Another way to reduce condensation is to ensure that the boat is well-ventilated. This can be done by using fans to increase airflow and by sealing drafts with shrink wrap, tapes, and door seals. It is also important to consider the placement of insulation, as putting insulation in the wrong places can make moisture problems worse. For example, increasing airflow under a mattress may not be effective, as the area under the bed bases will be close to the temperature of the seawater, which is often cold. Instead, insulation can be stuck to the underside of the bed bases and hatch covers.
Using the correct type of insulation is also important for reducing condensation. Closed-cell foam, such as neoprene or cross-linked polyethylene, can be applied to the inside of the hull with contact cement. This type of insulation comes in different densities and can be exposed, so it needs to be a light colour. Another option is to use cork, which is flexible, has a high insulation factor, reduces noise, and prevents mould.
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Insulating windows
One way to insulate windows is to use bubble wrap. Bubble wrap has been shown to stay in place for an entire season on glass, Lexan and acrylic, including locations where light curtains brushed across it every few days, such as sliding glass doors and boat windows. The R-value of bubble wrap is low, at about 1.2, but for single-glazed windows, this cuts heat loss in half.
Another option is to use plexiglass over the salon windows, which can help with insulation. It is also important to plug drafts, which can be minimised with shrink wrap, tapes, and door seals.
Finally, it is important to note that any insulation must be sealed. If the outside or duct temperature is below the dew point, there will always be a location within the material that is at the dew point, and moisture will be drawn to that area.
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Sealing insulation
One common method of sealing insulation in a fibreglass boat is by using foam panels, carpets, and batts of insulation against the hull. This helps to reduce heat loss through conduction, which is heat transfer through surfaces such as the hull, bulkheads, and windows. To further seal and insulate the boat, you can use caulking to fill in any gaps or openings. One person recommends cutting 4x8' sheets of two-inch pink foam board insulation into 2" strips to line the hull, then sealing the edges with vertical beads of caulking. This ensures that no air gets between the foam and the hull, maximising the insulation's effectiveness.
Another option for sealing insulation is to use a product like Mascoat, which can be painted on to the interior of the boat. This is especially useful for areas where foam and carpet are not suitable alternatives. Mascoat has been reported to work extremely well in reducing condensation. Additionally, you can use tapes, door seals, and shrink wrap to minimise drafts and seal openings, which will help retain heat.
For a do-it-yourself solution, one person recommends using 1/4" acoustical cork, which can be applied with construction adhesive. This method provides both sound deadening and thermal insulation. It is also easy to clean and maintain, requiring just a few Clorox wipes to keep it looking good as new.
Finally, there are various sealants and repair pastes specifically designed for fibreglass boats that can be used to seal and insulate your boat. These products often provide watertight bonding and can be used for boat building, repair, and composite coatings. Some examples include the 3M Marine Adhesive Sealant 5200 and the Julam Fiberglass Boat Repair Paste.
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Insulating air conditioning ducts
There are a few different methods and materials that can be used to insulate air conditioning ducts in a fibreglass boat. One option is to use bonded closed-cell foam, which is a cheap and effective solution. Areoflex and Armacel products are specifically designed for this purpose and are easy to install. Another option is to use a paint-on product like Mascoat, which can be useful in spaces where foam and carpet are not alternatives.
For those looking for a more comprehensive solution, it is recommended to insulate the entire hull of the boat. This can be done by cutting 4x8' sheets of two-inch pink foam board insulation into 2" strips and lining the hull. It is important to run vertical beads of caulking and press them into place, sealing the edges to ensure no air gets between the foam and the hull. This method has proven successful in cold climates like Toronto and Alaska.
Additionally, it is important to consider the amount of moisture created in the boat and to air it out and circulate the air regularly. Well-ventilated boats do not usually have condensation problems. In very cold climates, it may be advisable to let uninsulated spaces go cold and restrict ventilation to prevent condensation.
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Frequently asked questions
Armaflex, cork, Glava, Rockwool, bubble wrap, fiberglass, closed-cell foam, spray foam, and Aerogel are some materials that can be used to insulate a fiberglass boat.
Insulation must be sealed to prevent condensation. Armaflex Class 0 is a good option as it is easy to work with, reasonably priced, and can be purchased as self-adhesive rolls.
Using a reflective canvas cover is a good way to keep a boat cool in the summer and prevent the winter chill. Bubble wrap can also be used to insulate windows, but it may peel away from painted wood and raw fiberglass.
Polyurethane spray foam, polyethylene sheets, polystyrene, cork, and Armaflex AP are all options for insulating the hull of a fiberglass boat.
