15 Easy Tips to Waterproof A Storage Shed in Your Garden
Workplace Inspiration

15 Easy Tips to Waterproof A Storage Shed in Your Garden

|Nov 9, 2022

The roof of a shed is typically attached to the side of a building, with a header attached to it and posts holding up the cross-beam. To support the roof, rafters span between the header and the beam. Waterproof storage shed roofs are often designed to support lighter loads but are also likely to be exposed beneath the main roof. As a result, you might be able to "double up" the rafters and strengthen the cross-beams, and learn how to waterproof the shed. 

When soaked after rain, about 10 inches of soil is needed for a garden, and that soil is even heavier than wet snow, and the water will rot out the roof framing due to the rot caused by the water in the soil. When you live in a snow country, you must add the "worst case" snow load to the saturated soil weight, which is a significant amount of weight. 

The majority of roofs are not designed to handle standing water, which is similar to wet soil. Under shingles or lapped metal roofing, water would gradually creep back up and cause the roof to rot. The risk of Impending Doom (TM) also needs to be considered. A fall from the roof will probably result in your death. Building a fence that can support your weight on the edge is difficult. You can waterproof your storage shed by following these 15 tips: 

Installing The Base

Your shed should be watertight from the ground up, even before it has been constructed. It is important to install a sturdy base for your weatherproof storage shed in order to keep it off the ground and away from damp soil. This allows the air to circulate. Choose a pressure-treated wooden pod for a garden base to ensure it is more resistant to rot, as a wide range of options is available. You may also need a concrete base for large, heavy-duty sheds. You may need to add floor bearers above concrete bases to help air circulate beneath them since concrete bases don't allow air to circulate underneath.

Installing The Base to waterproof storage shed

Doors And Windows

You should maintain the wooden frames around your shed's windows and doors regularly to ensure they maintain a dry environment. The shrinkage of wood can cause cracks and gaps, allowing water to penetrate. Foam or caulking should be applied to any holes. Furthermore, water can cause wooden frames to rot, which weakens them. If there are any soft spots in the wood, probe them with a screwdriver. After filling these holes, sanding and repainting are necessary. If you want to add extra protection and insulation to your door, you should also consider installing a draft excluder.

Keep The Gutters Clean

There are many problems associated with blocked gutters. A build-up of leaves and debris in the gutters can prevent water from draining down, leading to flooding. During the winter and autumn, check your gutters regularly with a stepladder to remove any debris.

Keep The Gutters Clean

Repair The Roofs

It's essential to keep an eye on the roof of your shed waterproofing because we experience constant, and often very heavy, downpours in the UK. Rain can penetrate the structure through any gaps or weaknesses. Ensure your roof is free of damage and general wear and tear by checking it regularly. Particularly hot spots are the edges of the roof and the ridge line and the areas where materials have been nailed down.

Use Sealant If Necessary

In many cases, roofs are covered in felt and easily repaired with additional felt and sealant. In order to apply the patch, lift up the damaged area and spray the sealant below. Then press down to secure it. Sealants should be sprayed on the lower surface of ripped shingles and pressed together. 

It’s necessary to replace the entire roof if it feels badly damaged. EPDM rubber sheeting is incredibly durable and long-lasting, so you can choose to replace it with felt again or go for an alternative option, such as felt.

Use Sealant If Necessary

When To Apply Wood Preservatives

Regardless of whether you purchased a pressure-treated waterproofing garden shed with a rot guarantee, you should treat your prefab shed annually with a preservative. Over time, pressure treatment may lose its effectiveness in preventing rot, insect infestation, and fungus in your garden structure.     

You should therefore top up your shed's treatment on an annual basis to ensure it's protected. Water-based stains or waterproof office pod paint are a good choice since they dry quickly and prevent dampness. In addition, they are less toxic than spirit-based stains, which are more chemically based.

Choosing The Right Shed Design

You need to have the right prefab accessory dwelling units for the job before you start implementing these tips. Therefore, if your shed has distorted window cavities and a hole in the roof, you might want to consider buying a new one. You might have to spend more upfront, but you will certainly save more in the long run if you do it correctly. In terms of shed cladding, shiplap is the best option - a type of tongue and groove cladding that has been upgraded for sheds. A tight fit between these interlocking shiplap boards makes the entire shed more rain- and moisture-resistant. You'll be at an advantage if you start with a tongue and groove shed as your foundation.

Choosing The Right Shed Design

Keep The Shed Away From Vegetation

The tip may seem counterintuitive at first. In fact, that's why they're called garden sheds - because they're usually installed in gardens! Then they go where the plants go, don't they? That's true, and that's false. Creating a plant-free perimeter around your shed can help keep it waterproof - especially if your existing building is damp. What's the reason? Plants and flowers require water to survive, so they're designed to draw moisture to themselves.

Consider Insulation

In order to keep your outbuilding free from dampness, shed insulation is an often overlooked, yet equally important, factor. As a result, the temperature is regulated and does not fall below the dew point. This makes our post on shed insulation, in some ways. 

Consider Insulation

Enhance Ventilation

Dry sheds are ventilated sheds. In addition to keeping your shed and its contents in good condition, proper airflow prevents moisture build-up. You can achieve proper ventilation by installing wall vents - read the post on ventilating a shed to learn how to do so.

Installing Membranes

Under the shed office and on the surface it sits on, a waterproof membrane is installed. In addition to not holding water and becoming soggy, the membrane won't allow water to pass through as well. The membrane is installed by placing it between the backyard office shed and the base it sits on. It is, however, necessary to place the shed on a solid foundation - such as concrete. You may find it easier to use a raised base if you do not have one in your garden.

Waterproof Paint

Wood should be protected from water by a layer of wood preservative, but waterproof paint adds extra protection. In terms of extending your garden shed's life, wood treatments such as paint can really come to your rescue. Waterproof paint resists water completely, so the wood underneath won't absorb moisture or become damp. Water will be repelled before it even gets a chance to enter your house after a couple of coats of waterproof paint.

Waterproof Paint

Using The Right Location

It is important to pick the right location for a waterproof storage shed. Most likely, you already have an idea of where you want your shed to go, but let's ensure it won't damage it. Low-lying areas with pools of water and constantly wet ground should be avoided. The sun will help evaporate any natural moisture if you choose an area that receives a decent amount of sun. You should avoid areas that have hollows or holes in the ground because this is where water will pool. When it rains, avoid areas with soil that doesn't dry out quickly. Water seepage and ingress from environmental moisture can be greatly reduced by starting with the right location for your shed colors.

Use Waterproof Felt For The Roof

The first piece of felt should be laid along the bottom edge of the roof. Lay the felt horizontally along the roof's length. Make sure the felt is hung about an inch over the edge of your roof so that water can run off. You will need a certain number of pieces of felt to cover your roof based on the width of the felt rolls you bought and the roof size.


The second piece should overlap the first piece. In the same manner, unroll the second piece of felt horizontally once the first piece of felt is nailed in place. Ensure that it overlaps the first piece slightly to facilitate water flow. The second piece should be nailed in place as before.

Damp And Musty Shed After Rain

You can revitalize your shed's color and provide it with a water-repellent sealant by treating it with wood treatment. Despite the fact that it will not prevent water from entering your shed through cracks and splits in the wood, it will prevent it from becoming damp and musty after rain.

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