Strategic Vent Placement For Boat Covers

Boat owners often face the problem of condensation and moisture build-up under their boat covers, which can lead to mould and mildew. This is a common issue as the properties that make fabrics water-resistant tend to reduce breathability. One solution to this problem is to install vents in the boat cover. Vents facilitate airflow, preventing moisture build-up and eliminating musty odours. They also protect the boat from external elements such as rain and debris.

How to prevent condensation under a boat cover

Condensation under a boat cover can cause mould and mildew to grow, so it's important to take steps to prevent this. One simple fix is to install a vent in the cover. This allows for air circulation and helps to keep the boat dry, reducing the chance of condensation.

When choosing a vent, look for one that is easy to install and affordable. The Vent Aire Ventilator is a good option, as it can be wrapped in fabric to match the colour of your boat. It's also a good idea to add a screen of Phifertex Mesh underneath the vent to keep rodents and other critters out.

If you don't want to install a vent, there are other ways to prevent condensation. One option is to use a moisture bucket or a dehumidifier inside the boat. You can also try to keep the boat dry before covering it and ensure that there is no gas leak, as fuel vapours can contribute to condensation.

Another option is to use a fan to circulate the air and reduce humidity. This can be set up to run for a set amount of time each day or left running continuously, depending on the level of condensation. Just be sure to empty any water collected in the canister regularly.

Finally, consider the fabric of your boat cover. While a waterproof fabric will keep water out, it can also trap moisture inside. Look for a fabric that allows for some air movement and venting, such as SunbrellaÆ or WeatherMAX™.

By following these tips, you can help prevent condensation under your boat cover and keep your boat in good condition.

How to prevent mould and mildew on a boat cover

Mould and mildew are a common problem for boaters, and they can be difficult to get rid of once they take hold. The key to dealing with mould and mildew is to prevent the conditions in which they thrive: moisture, warmth, and stagnant air. Here are some tips to prevent mould and mildew on your boat cover:

Choose a Quality Boat Cover

A quality boat cover is essential for protecting your boat from the elements. Look for a cover that is specifically designed for boats, as these will have features that increase their lifespan and protect your boat. The cover should be made of a breathable material that allows air circulation while keeping out rain and moisture. It should also have a ventilation system to allow any moisture that does get through to escape.

Ensure Proper Ventilation

Proper ventilation is crucial in preventing mould and mildew. This includes both the boat itself and the cover. For the boat, keep all areas exposed to airflow by leaving cupboards, lockers, rooms, and bilge covers open. Install vents such as passive cowls or dorades, or active solar-powered fans. These will help to keep the air circulating and prevent stagnant areas where mould and mildew can grow.

When it comes to the cover, avoid a tight-fitting cover that does not allow for ventilation. If you already have a tight-fitting cover, consider adding active ventilation in the form of solar fans. Also, make sure that the cover is not causing any pooling, as pooled water can find its way into your boat and create the perfect environment for mould and mildew to grow.

Eliminate Water Ingress

Check for any leaks or areas where water might be getting into your boat. This includes checking all seals around deck-penetrating hardware such as hatches, stanchions, cleats, ports, vents, and windlasses. If you find any leaks, repair them and dig out any deck core rot before filling and resealing the area. Don't neglect other areas such as scuppers, thru-hulls, hull joins, and the bilge, as these can also contribute to water ingress.

Regular Cleaning and Maintenance

Perform regular inspections and cleanings of your boat and cover to prevent mould and mildew. Check for any leaks or standing water, and air out the boat regularly. Clean your boat cover at least once a month with clear water and then air dry. This will prevent dirt and other substances from building up and providing a breeding ground for bacteria. If you do spot any mould or mildew, clean it immediately with a vinegar and water solution or a mild soap and bleach solution.

Use Moisture Absorbing Products

To help keep your boat dry, consider using moisture-absorbing products such as silica gel packets or moisture buckets. These products absorb water vapour and prevent mildew and mould from growing. Place them in enclosed areas of your boat to help prevent moisture buildup.

How to install a vent in a boat cover

Installing a vent in your boat cover is a simple project that can help prevent mould and mildew caused by condensation. There are several types of vents to choose from, but the Vent Aire Ventilator is recommended for being easy to install, affordable, and able to be wrapped in fabric for a more uniform look. Here is a step-by-step guide on how to install a vent in your boat cover:

Determine the location of the vent

Choose a spot on your boat cover where you want the vent to be located. Consider the size and shape of the vent when determining the location.

Trace the vent on the fabric

Use a pencil or fabric marker to trace the outline of the vent on the boat cover fabric. This will help you cut an accurately sized hole for the vent.

Cut a hole in the fabric

Using sharp scissors or a knife, cut a hole in the fabric about 1/2-inch (or 1.27 cm) from the traced line. This will give you some extra fabric to work with when attaching the vent.

Cut out Phifertex Mesh

Phifertex Mesh is a type of screen material that can be placed underneath the vent to keep rodents and other critters out. Cut the mesh to be 1/2-inch (or 1.27 cm) larger than the opening all around. This will ensure that it covers the opening securely.

Cover the vent with fabric

Use basting tape to attach the fabric to the vent. This will give a more finished look to the installation and help secure the vent in place.

Sew the fabric to the vent

Sew across the bottom opening of the vent to securely attach the fabric. This step may require a sewing machine or needle and thread, depending on the thickness of the fabric and vent material.

Baste the vent and mesh in place

Use basting tape or another suitable adhesive to temporarily attach the vent and mesh to the cover. This will hold them in place while you sew them securely.

Sew through the vent and mesh

Using a needle and thread or a sewing machine, sew through the vent and mesh to permanently secure them to the cover. Be sure to sew through all layers of fabric, vent, and mesh for a strong hold.

By following these steps, you can effectively install a vent in your boat cover, helping to reduce condensation and improve airflow. Remember to choose a vent that best suits your needs and follow any additional instructions provided by the manufacturer.

Different types of boat vents

Proper ventilation is crucial for boats, and there are a variety of different vents available on the market.

Clamshell Vents

Clamshell vents are so-called because of their shape and design. They are usually used as entry points for piping and wiring. Thanks to their design, they can also be used to hide hull fittings like deck drain scuppers, fuel tank vents, or the top section of special through-hull vents.

Rounded Louvered Vents

Rounded louvered vents are designed to allow airflow when venting hoses while keeping out unwanted elements.

Mushroom Vents

Mushroom vents have a curved hood, similar to the top of a mushroom, and are primarily used to regulate air in cabins on the lower deck of boats. They can be adjusted as necessary by being lowered or raised. The mushroom shape helps keep rainwater and spray out while allowing air to flow freely.

Deck Vents

Deck vents are used to allow air to flow freely through the engine area or room and any cabins on your boat while reducing the amount of seawater, spray, and rain.

Air Suction Vents

Air suction vents are designed to force air in and out of areas that require ventilation.

Marine Cowl Vents

Marine cowl vents are usually mounted on the deck and bring air into the bilge or cabin to ensure ventilation. When used with Dorade boxes, these vents allow air to travel freely without obstruction, while preventing unwanted water from getting into specific areas. Thanks to their wide and cleverly shaped openings, they allow large volumes of air to flow freely and are normally found installed protruding from the boat deck.

Transom and Locker Vents

Transom and locker vents are ideal for areas that require discreet yet adequate ventilation.

Butterfly Vents

Butterfly vents provide adjustable airflow control.

Louvered Vents

Louvered vents are similar to cowl vents but have adjustable louvers that allow you to control the amount of airflow.

Solar Vents

Solar vents are powered by solar panels and are ideal for boats without shore power access.

How to prevent condensation when trailering

Condensation is a common problem for boat owners, especially in colder months. The issue is exacerbated when trailering, as the boat is enclosed and unable to "breathe". However, there are several ways to mitigate this problem and ensure your boat remains dry.

Ventilation

One of the most effective ways to prevent condensation is to ensure proper ventilation. This can be achieved by installing boat vents and vent covers. These come in a variety of types, including transom and locker vents, butterfly vents, clamshell vents, and louvered vents. They allow for air circulation, reducing moisture build-up and eliminating musty odours.

Temperature Control

Temperature variations can be a significant cause of condensation. Aim to minimise temperature fluctuations by keeping the internal temperature of the boat relatively consistent. Avoid extreme temperature changes, especially when cooking or using heaters.

Cooking Strategies

Cooking is a major contributor to moisture build-up. To minimise condensation when cooking, use lids on pans, employ a pressure cooker, or opt for faster cooking options. A cockpit tent is also beneficial, as it allows you to keep the hatch open regardless of wind direction, venting cooking moisture out of the saloon.

Insulation

Insulation is key to preventing condensation. Look for insulation with a closed-cell structure, such as Armaflex, Low-e, Aerogel, or Dow. Insulating surfaces creates a barrier that prevents warm, humid air from meeting cool surfaces, where condensation would otherwise form. Insulation also reduces energy consumption and helps keep the boat cool in summer.

Dehumidifiers

Dehumidifiers are an effective tool for removing moisture from the air. There are two main types: condensate dehumidifiers and rotary desiccant dehumidifiers. The former is cheap but ineffective at low temperatures, while the latter works down to freezing. If you have shore power access, a dehumidifier is a powerful solution.

Fans

Computer fans, such as those used in PC cases, can be installed to gently blow air into specific areas of the boat. Slower, quieter fans are preferable, and they should be ball-bearing types if laid flat rather than standing. These fans are inexpensive, use minimal power, and can significantly reduce condensation when placed in problem areas.

By implementing these strategies, you can effectively prevent condensation when trailering your boat, ensuring a dry and comfortable environment.

Frequently asked questions