Damp-proofing your wooden shed is recommended to prevent rot, warping, and mould from appearing because of prolonged exposure to moisture. Damp-proofing your shed is also worthwhile to increase its longevity, allowing the wood to stay stronger for longer. If you want to learn how to waterproof a shed, or how to build a waterproof shed, the following guide will be essential reading.
Why do you need to waterproof a shed?
Waterproofing a shed creates a protective seal that prevents moisture from penetrating the walls of your wooden shed which could end up leaking onto your belongings. Another concern with moisture exposure is that it can reduce the strength of the wood resulting in warping, sagging, and a weaker structure that is more susceptible to winds and harsh weather conditions. Waterproofing a shed roof is also an important part of the process which we will cover shortly.
Waterproofing your shed makes it better suited to the ever-changing weather while stopping moisture from compromising the structural integrity of the shed. Read on to learn how to waterproof a well-suited shed for British weather conditions.
How to waterproof a shed step-by-step
Here is our step-by-step guide walking you through how to build a waterproof shed and how to waterproof a shed you already have. We also detail waterproofing a shed roof in addition to covering how to build a waterproof shed, allowing you to enjoy the moisture-resistant benefits from the start of your shed’s life.
Add guttering
If you are looking to learn how to waterproof a shed, guttering is a good place to start. Guttering is essential for moving rainwater away from your foundation, preventing pooling and eventual water damage leading to numerous structural problems. Guttering should be checked and cleaned regularly to avoid debris and dirt buildup from blocking the flow of water. Guttering is relatively inexpensive and is a must-have for shed owners who are looking to keep their shed in good condition for years to come.
Apply waterproof sealant
One of the biggest threats against your shed’s health is moisture and water damage. That is why in addition to guttering, extra measures are necessary to protect your shed walls and materials from constant exposure to moisture. Applying a good sealant will protect your wood from rot and warping which comes because of regular exposure to the elements for long periods.
Caulk windows and doors
Another layer of defence against moisture is achieved by caulking around doors and windows to provide a seal that stops moisture from getting into any spaces or gaps present around your shed. This should be applied around windows and door frames and checked afterwards to ensure constant unbroken application.
Clear gutters
Cleaning your shed’s gutter is an important maintenance task that can make a huge difference to the longevity of your shed. If water cannot flow away from your shed and foundation then pooling will occur leading to rot, mould, and eventual warping and sagging. Regularly cleaning your shed’s gutter ensures that rainwater can flow away from your shed.
Clear surrounding debris
Part of your regular maintenance should be tidying up and cleaning your shed’s surrounding area. This can be easy to overlook, but keeping the surrounding area clear will aid in water drainage. Any debris that is present close to your shed can hold water in place creating small areas of pooling that can cause damage if left.
Waterproofing a shed roof
The first step to waterproofing a shed roof is to keep it clear. Your roof is an area that should be regularly cleared of any debris that can hold water in place for long periods. Over time this can lead to rotting and eventual leaking so cleaning your roof is an important part of regular shed maintenance.
Ensure door seals are tight
Seals around your door can wear and become ineffective over time which is why you should regularly inspect any doors for leaking and replace the seal where appropriate. Weatherstripping or foam tape can be used to form a protective barrier against rain.
Install a damp-proof membrane
A damp-proof membrane (or DPM) can be used to stop moisture from rising from the ground below your shed. This is usually applied when assembling the shed and is placed between the foundation and the floor, acting as a moisture barrier. Using a polythene DPM provides long-lasting protection against the elements and is easy to install. If you are building your shed and looking at how to build a waterproof shed, applying a DPM from the beginning is highly recommended.
Install insulation
Insulation will aid in keeping moisture out but will also provide better temperature regulation inside your shed. This is particularly useful in buildings that will be used as workshops and offices but is also a must-have for shed owners who are looking for the best protection against damp and moisture exposure.
Install roof felt
Felt is a popular and affordable choice when waterproofing a shed roof and is effective at protecting against harsh winds and heavy rain. Felt roofing should be installed by overlapping the material to ensure reliable long-lasting protection against winds that could otherwise lift the material leaving your structure exposed to moisture and rainwater.
Install ventilation
Keeping the air circulating in your shed will help to reduce condensation and the eventual buildup of moisture. It is common for vents to be installed at high and low points which encourages airflow around your garden shed.
Paint exterior walls
Water-resistant paint adds another line of defence to your shed in the fight against moisture.
Apply multiple layers as needed and take time to include complete coverage of edges and any gaps to ensure an effective barrier. Adding the correct type of water-resistant paint also has the benefit of protecting from UV exposure, further preventing damage from occurring because of long-term exposure to the elements.
Repair cracks or holes
It is important to act early when discovering any cracks or holes in the walls, roof, or floor of your shed to prevent further damage. Weatherproof filler should be applied to fill the cracks or holes and prevent moisture from entering your structure.
Repair roof leaks
A damaged roof can be a disaster for your shed and your items being stored inside. It is important to act quickly, repairing or replacing any of the felt that contains damage or holes. Sealants can be used elsewhere around the roof where any cracks or damage are detected.
Repaint shed
Sheds can be repainted to provide better resistance to moisture and weather exposure. This also has the added benefit of improving the appearance of your shed while adding fresh moisture protection. Multiple coats may be required to provide optimal results.
Replace damaged roof felt
It is important to replace your shed’s felt when any damage is visible, but it is also advisable to replace felt that appears to be worn or showing signs of early damage. Acting early will save you from a worse situation further down the line. Waterproofing a shed roof can seem like an ongoing process for older sheds with ageing felt unless you completely replace the material.
Replace rotten wood
Rotten or rotting wood should always be addressed immediately via replacement as the material strength is compromised and could spread further throughout your shed. Any replacement of material should include appropriate waterproofing to provide long-lasting protection.
Rustproof metal fixings
Using a rust-proof coating protects metal fixings against the results of constant exposure to moisture. This can be applied to metal fixings and hinges - even screws and nails to prevent the early signs of rusting. Rust-resistant paints can last up to 5 years, but regular inspection is recommended.
Seal around roof edges
Check the edges and seams of your roof for any leaks or damage. Make sure you apply a waterproof sealant to stop leaks and check around the shed interior where the wall meets the roof for any gaps or leaks.
Treat wood with preservative
Treating your shed’s wood with a preservative is one of the most important steps to ensure lasting protection from prolonged exposure to the elements. Some timber treatments may require an annual application - be sure to read the documentation included within your chosen preservative for optimal results. If you are looking for tips on how to build a waterproof shed, treating your wood with preservatives from the start is a must.
Use silicone sealant on joints
Using a silicone sealant on any joints of your shed creates a protective seal that stops moisture from getting in. Silicone sealant should be applied where two surfaces join and throughout your shed wherever you find seams and joints.
Conclusion – how to build a waterproof shed
In conclusion, the longevity of your wooden shed depends on damp proofing it. You can avoid moisture damage, rot, and mould that could compromise the structure of your shed by waterproofing it now that you understand how important it is. To further defend against water infiltration, install a damp-proof membrane along with a waterproof sealant. Over time, regular maintenance will keep your shed in good shape. This includes treating wood with preservatives and cleaning out gutters. So, get waterproofing your shed and protect your investment from the weather.
Contact us
For any enquiries, please send emails through our contact form, and we will connect you with a knowledgeable member of the Shedstore team. Our experts will address all your questions and guide you through everything you need to know about maintaining and waterproofing your wooden shed.
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Whether you require advice on shed maintenance, waterproofing solutions, or general queries, we are here to assist you in making informed decisions for your garden building needs.