Sofia Martinez
Condensation in plastic sheds is a common problem, especially during the colder months. It occurs when warm, moist air comes into contact with cooler surfaces, leading to issues such as mould, mildew, and damage to the shed's structure and contents. To prevent condensation, it is essential to address the root cause, which is often related to ventilation, temperature control, and foundation dampness. Here are some effective strategies to keep your plastic shed condensation-free and protect your belongings from moisture damage.
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What You'll Learn
- Ventilation: install air vents, fans, or open windows
- Insulation: use foil bubble wrap, PIR boards, or polystyrene panels
- Dehumidifiers: use calcium chloride or silica gel to absorb moisture
- Foundations: use a damp-proof membrane, seal concrete, or use a steel foundation
- Storage: keep the shed organised and avoid storing damp items
Ventilation: install air vents, fans, or open windows
One of the most effective ways to prevent condensation in your plastic shed is to improve ventilation. Ventilation helps to stop damp air from building up and ensures a constant supply of fresh air.
You can install air vents near the roofline to allow warm air to escape. Exhaust fans placed on the floor or ceiling can also be used to remove moist air from inside the shed. Window fans are another option, as they pull in fresh, dry air and expel stagnant, humid air. You can adjust the settings on window fans to suit the changing seasons.
If your shed does not have built-in ventilation, you can add plastic vents to both ends of the structure. These can be left open when the shed is not in use, and closed when you want to keep it warmer. Opening windows are another good source of fresh air, and can aid airflow within the shed.
In addition to installing vents and fans, you can improve ventilation by organising the items in your shed. Clutter can lead to poor air circulation, so consider adding vertical shelving and using airtight plastic storage boxes to contain your items. For large equipment or furniture, elevate them off the ground using pallets or stands to improve airflow.
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Insulation: use foil bubble wrap, PIR boards, or polystyrene panels
If you're looking to insulate your shed to prevent condensation, there are a few options to consider.
Foil bubble wrap is a suggested method to retain heat in the winter and keep the shed cool in the summer. This method can be dangerous if you have electrics in your shed, as the bubble wrap can combust and cause a fire. However, foil-backed compressed insulation is a safer alternative that is easy to work with and has a good U-value for efficiency.
PIR boards are another option for shed insulation. PIR stands for polyisocyanurate, which is a low moisture barrier material with excellent thermal conductivity. PIR boards are general-purpose boards that can be applied to walls, floors, and ceilings. They are also not attractive to rodents, which is an issue with some other insulation types.
Polystyrene panels, or EPS (expanded polystyrene) boards, are another type of insulation that can be used. EPS is a foam plastic formed of solid polystyrene beads, providing high-performance thermal insulation. However, it is worth noting that EPS boards are softer and can attract rodents, and they have lower thermal conductivity than PIR boards, requiring a larger thickness.
When insulating your shed, it is important to consider factors such as the size of the structure, the required application method, and your budget. If you are unsure, it is recommended to consult a building professional to determine the best insulation material for your shed.
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Dehumidifiers: use calcium chloride or silica gel to absorb moisture
Dehumidifiers are an excellent way to combat condensation and moisture in your shed. Calcium chloride and silica gel are two of the most effective desiccants used to combat moisture damage. They are powerful moisture absorbers, but they work in different ways.
Calcium chloride is a chemical desiccant with a white, crystalline substance that is highly soluble in water. It is a hygroscopic salt that attracts water molecules through hygroscopy and absorbs moisture into its internal structure. Its capacity to absorb water increases over time, and it can absorb over 250% of its weight when placed in an environment with 30 degrees Celsius and 90% relative humidity during 30 days. It is perfect for high-humidity areas where fast moisture control is needed, such as shipping containers or storage spaces. It is also environmentally safe, as it can be disposed of through regular wastewater.
Silica gel, on the other hand, is a natural desiccant and a porous, granular substance made from silicon dioxide with a high surface area. It adsorbs moisture from the air, meaning the water molecules adhere to its surface. It comes in various sizes and shapes, including small desiccant packs, beads, and powder form. It is typically used for moisture control inside product packaging, electronics, leather goods, and food. It can also be dried out and reused multiple times, making it a good option for a reusable drying agent.
Both calcium chloride and silica gel can be effective at reducing condensation and moisture in your shed. However, if you need maximum moisture absorption, calcium chloride is the stronger option. If you require a reusable option that stays dry, silica gel is the better choice.
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Foundations: use a damp-proof membrane, seal concrete, or use a steel foundation
One of the most important factors in preventing condensation in a plastic shed is the foundation. If there is any dampness in the foundation base, it can lead to condensation issues. Here are some methods to address this:
Use a Damp-Proof Membrane
A damp-proof membrane is a plastic sheet that is laid over the ground before the concrete slab is poured. This membrane acts as a barrier, preventing moisture from seeping up from the soil into the concrete and, subsequently, your shed. Ensure that the plastic sheets are inserted about 2 inches higher than the surrounding area for maximum effectiveness.
Seal Concrete
If you already have a concrete foundation, sealing it can help prevent water ingress. Allow the concrete to cure for at least a week, and preferably longer in damp weather, before proceeding. After securing your shed to the base, seal the inside along the base rails with a silicone or mastic sealant. This will create a barrier against water seeping into the interior of your shed.
Use a Steel Foundation
Another option is to use a steel foundation kit. Apply a waterproof membrane on top of the steel foundation and seal the seams with waterproof tape. Then, lay an OSB board, and you can even add a layer of lino on top for further protection. This method provides an effective barrier against condensation.
While the above methods focus on addressing the foundation to prevent condensation, other complementary strategies include improving ventilation, using desiccants or silica gel packets to absorb moisture, and ensuring that items stored in the shed are completely dry before placing them inside.
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Storage: keep the shed organised and avoid storing damp items
Keeping your shed organised is essential to preventing condensation. Cluttered sheds lead to poor air circulation, which causes a buildup of moisture and, subsequently, condensation. Organising your shed and throwing out old and rusted objects can reduce the risk of moisture damage.
To improve air circulation, add vertical shelving to keep items off the floor. For large equipment or furniture, elevate them off the ground using pallets or stands. This will allow air to flow more freely around the shed.
Silica gel packets can be added to storage containers to absorb moisture. These are the same packets that come in new shoe boxes or vitamin packs. They are highly effective at keeping the environment dry and moisture-free.
When storing gardening equipment and leisure items, ensure they are completely dry first. Do not store damp items in the shed as this will add moisture to the air.
Finally, avoid overloading your shed with too many items. A shed packed with objects will be more susceptible to condensation.
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Frequently asked questions
Condensation occurs when warm air inside the shed meets a cold roof. To prevent this, you can insulate your shed to keep it warm and above the dew point. You can also improve airflow by adding a window fan or installing vents.
You can use anti-condensation sheets, sprays, or paints to protect the underside of your shed roof. You can also glue polystyrene panels to the underside of the roof using 3M Spray 77 Adhesive.
When building a shed, it is important to minimise dampness in the foundation. You can use a damp-proof moisture membrane to prevent water ingress. You should also allow the concrete base to cure for at least 7 days before securing the shed to prevent condensation cycles from forming.
