Some Boats are affected and others are not, this is because there are so many types of boats and so many variables, such as:
- General Condition and Integrity: of the hull, windows, and doorframes.
- Bilges: wet, vented or unvented.
- Insulation: type and properties.
- Windows: porthole, rectangular, double-glazed, sliding, overall surface area of glass.
- Mushroom Roof Vents; quantity and location.
- Length Of Boat: internal cubic capacity, and external colour.
- Use: Time aboard, amount of people on board.
- Facilities: showers, washing machines, driers, and fridges.
- Cooking and Kettles
- Pipe work: under deck, surface mounted, behind lining, lagged sufficiently or not, etc.
All these factors and more can determine whether you will suffer from condensation and damp or not and if you do, how best to combat it.
When the boat is in use, good housekeeping and through ventilation is obvious but when not in use this is not quite so easy.
When berthed, the windows and cabin shell of the boat, in warm ambient temperatures (even in mid winter sun) easily warm up and transfer the heat from the exterior to the interior of the boat, any moisture retained from during general use, whether held within soft furnishings, materials, carpets, books etc. or actual water below deck, can be turned into a vapour where it naturally travels upwards and around in the warm atmosphere returning back to water on cooler surfaces when the atmosphere cools . Where the moisture lands and creates condensation /damp, may not be anywhere near where it manifested from.
Dampstick’s capture airborne moisture (3.5 litres and weighs more than 2.5 kilos) and remove it, containing it in the sealed inbuilt reservoir/sump, thus 100% preventing any further re-circulation, whereas most of the non-powered de-humidification options (especially bowls of salt) do not prevent 100% re-circulation.
If my boat is left for long periods how many Dampstick’s do I need?
Because of the aforementioned variables, its very difficult for us to determine and make recommendation, our suggestion is, 30’ to 50’ foot open plan boats, if leaving unoccupied for a period or overwintering, hang at least two Dampstick’s on strong hooks either equidistant to each other or close to particularly effected areas, you will, after a week or so, see how they are performing. (The Prills contained in the upper chamber are Anhydrous compressed 99% Calcium Chloride and will be activated as soon as the Dampstick is removed from the sealed bag but they will take at least a week to start deliquescing).