Do Plastic Sheds Get Damp?

So you’re thinking of investing in a plastic shed to store your valuable outdoor belongings. But a lingering concern remains: do plastic sheds get damp? Understanding this possible susceptibility can help ensure your investment is worthwhile.

In this blog, we will explore the moisture factor in this type of garden building. Read on and discover whether they are prone to dampness or not.

Plastic Sheds

Lifetime 12.5ftx8ft Heavy Duty Plastic Shed
Lifetime 12.5ftx8ft Heavy Duty Plastic Shed

Plastic sheds have emerged as a popular choice for storage solutions in the UK. Known for their durability, they are constructed from high-quality polypropylene or PVC materials. Meaning plastic sheds can withstand weather conditions, including rain, snow, and UV exposure. The lack of wood in the material makes them resistant to rotting and warping.

Affordability is another key advantage of plastic sheds. They are often more budget-friendly than their wooden and metal counterparts. Additionally, their lightweight nature simplifies transportation and assembly, saving time and effort.

Even better, a plastic shed requires minimal maintenance. They don’t require staining, sealing, or repainting. This, overall, reduces the cost and time investment associated with upkeep.

However, despite these benefits, concerns related to dampness can’t be overlooked. Moisture accumulation can pose a threat to the integrity of stored items. This can potentially lead to damage or deterioration. Scroll down to explore the factors influencing dampness in plastic sheds.

Factors Influencing Dampness in Plastic Sheds

BillyOh Oxford Pent Plastic Shed Dark Grey With Floor
BillyOh Oxford Pent Plastic Shed Dark Grey With Floor

External factors like weather conditions can contribute to moisture accumulation inside the shed. What’s more, the proximity of the shed to water sources, such as sprinklers or downspouts. Even the surrounding landscaping can increase the likelihood of dampness. This is particularly true if it restricts airflow or creates a damp environment.

Poor shed foundation or improper assembly can exacerbate dampness issues. A shed that isn’t properly levelled or lacks a solid foundation may allow water to seep through gaps or cracks. Improper assembly can also result in poor seals, allowing moisture to enter the shed.

Now it’s time to explore preventive measures to minimise the impact. By addressing these factors, you can ensure a dry and well-maintained plastic shed.

Preventive Measures to Minimise Dampness

Jasmine 8x5ft Plastic Pent Shed with Floor
Jasmine 8x5ft Plastic Pent Shed with Floor

Proper garden shed placement is paramount when it comes to minimising dampness. Position the shed away from areas prone to water accumulation, such as low-lying spots.  By selecting a well-drained location, the risk of water seeping into the shed is reduced.

Equally important is ensuring a solid and level foundation for the shed. A stable foundation provides structural support and prevents water seepage through gaps. Meanwhile, a properly levelled base ensures water drains from the shed.

Proper ventilation and airflow within the shed are key to maintaining dry conditions. It allows for air circulation, reducing the chances of condensation and moisture buildup. This can be achieved through vents or windows to ease fresh air flow.

Additional steps can be taken to address moisture issues. These may include using moisture-absorbing materials such as weatherstripping to enhance water resistance. Or conducting regular inspections and maintenance to detect and address sources of dampness.

Managing Moisture in Plastic Sheds

An expert placing weatherstripping on the roof

(Image Credit: NARA)

One effective strategy is the use of moisture-absorbing materials such as desiccants. These substances help to reduce humidity levels inside the shed, preventing moisture. Additionally, moisture-resistant paints can be applied to the interior walls. They can help create a barrier that repels water and reduces dampness risk.

Another trick is the use of sealants and weatherstripping. Applying sealants to gaps, joints, and seams helps create a watertight seal. This approach prevents water intrusion during heavy rains or storms. Weatherstripping can be used around doors and windows to ensure a tight seal. It further reduces the likelihood of moisture seepage.

Lastly, regular maintenance and inspections. By conducting routine checks, you can identify and repair any damaged seals promptly. Keeping the shed clean and well-ventilated also keeps moisture buildup at bay.


Plastic garden sheds offer numerous advantages, such as durability, affordability, and low maintenance. However, concerns regarding dampness cannot be ignored.

Understanding the potential causes and implementing regular maintenance can ensure a moisture-free shed. Such actions can give you peace of mind and enable you to make the most of your storage solution.

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