The first question you need to ask yourself when thinking of building a resin shed in the backyard is: Do resin sheds need a foundation?
Yes, a good base for most resin sheds is definitely advisable. While resin sheds are lightweight, water-resistant and the installation process is easier than many of the wood or metal sheds, they do require a stable, flat and well-drained surface to function correctly.
A good foundation will prevent shifting, sinking, warping or instability of the shed over time. It can also help to improve drainage, increase the life of the shed and ensure doors and windows function properly.
This guide will explain why it is necessary to have foundation for resin sheds, the best kind of foundation and how to prepare the ground for installation.
Why Does a Resin Shed Need a Foundation?
Most resin sheds are manufactured from tough plastic materials like polypropylene, PVC or high density polyethylene. Though these materials are waterproof, insect and rot-proof, the shed requires the foundation below it to provide stability.
If the foundation is not adequate, there are a number of issues that can arise.
1. Uneven Ground Can Affect the Shed
The resin shed should be built on a flat area. In uneven ground, one side of the shed will be at a higher elevation than the other.
As time passes, this can cause the shed panels or floor to become misaligned. Gaps around doors or panels may become difficult to open, close or seal.
A level foundation will provide a uniform load distribution and stable install base for a shed.
2. Soil Can Shift or Sink
While it might be convenient to place the resin shed directly onto soil, soil can shift due to foot traffic, freezing temperatures and rain.
The soft soil may compress under the weight of the shed and its contents. In the event of one part settling deeper than the other, the shed will be unbalanced.
This risk is minimized when a foundation is properly prepared.
3. Better Drainage
One other relevant factor is the availability of water.
A foundation can be made higher, above the level of the surrounding ground, and can facilitate the drainage of rain water. This can be especially beneficial on heavy soils or in wet locations.
Resin does not rot, but standing water around the shed can cause issues with the floor, stored items and ground.
4. Improved Wind Resistance
A shed that is built of light resin can be more susceptible to the force of a wind than a heavy masonry or concrete shed.
A secure foundation provides a solid base to anchor the shed. The shed manufacturer might suggest concrete slab, wood platform or other appropriate foundation, depending on the type of shed and the local climate.
Follow manufacturer's instructions for anchoring at all times.
What Is the Best Foundation for a Resin Shed?
There is no one foundation solution that fits all resin sheds. This will depend on the use, size, location, soil, and climate of your shed.
Concrete slab, gravel, paver and wooden platform foundations are common options.
Concrete Slab
One of the most durable structures that you can use for a resin shed is a concrete slab.
It offers a sturdy, flat and stable surface and is especially effective for larger sheds or sheds that will accommodate heavy equipment.
A concrete foundation can also offer great long-term stability and anchoring properties.
But, concrete is generally more complex, involves more materials and labor compared to other foundation alternatives.
Gravel Foundation
For many small resin sheds, a well-prepared gravel base is a viable choice.
Usually the steps are to clear the site, level it, apply an appropriate base material, compact it and then lay the shed.
Gravel offers good drainage and can be more easily installed than a concrete slab.
Ideally the gravel should be held and compacted not just laid down as loose rubble.
Paver Foundation
It is possible to also use concrete or patio pavers to provide a stable base for a resin shed.
Pavers can offer a relatively good finished look and can allow rain water to seep through the joints.
It's all about preparation. The underlying ground should be properly compacted and the pavers installed level. The shed may become uneven if individual pavers settle at different rates.
Wooden Platform
Alternatively, the wood platform used for a resin shed can be pressure treated.
The method can lift the shed up from the ground and offer flat installation surface. It may also be helpful if the yard is slightly hilly.
But wood in the open will be subject to moisture and insects and therefore, the use of the right weather resistant materials and construction techniques are crucial.
Can You Put a Resin Shed Directly on Grass?
In most cases it is not advisable to place a resin shed on grass.
Grass and topsoil may become soft following rain, and uneven ground may settle. The shed can also grow under vegetation which can cause maintenance issues later on.
Some homeowners may decide to construct a shed on land that has been prepped for the purpose of a temporary or small storage unit. A dedicated foundation is better though in the long term.
Prior to installation, the area should be cleared of both grass and organic material and a level, firm base should be established.
Can You Put a Resin Shed on Gravel?
Yes. Many resin sheds can be built on a well laid gravel base.
It's important to know the difference between a compacted gravel foundation and loose gravel.
The loose gravel may shift when weight is put on it. An adequate gravel base consists of an appropriate aggregate, depth and compaction.
The completed foundation should also be even and (if necessary) raised above the surrounding ground to promote drainage.
Does a Small Resin Shed Need a Foundation?
An appropriate foundation for a resin shed is always a good idea, even if it's just a small shed.
The weight of a small shed can be less than that of a large storage building, but the foundation still makes a difference in keeping it from moving and settling.
A compacted gravel base or paver base or appropriate outdoor platform may be appropriate for a lightweight garden shed, depending on the manufacturer's specifications and local conditions.
The more substantial and heavy the shed is, the more vital the sturdy base is.
How to Prepare the Ground for a Resin Shed
Proper ground preparation is often more important than the specific foundation material.
A basic preparation process includes:
1. Choose a suitable location.
Select an area with good drainage and enough clearance around the shed for installation and maintenance.
2. Measure the shed footprint.
Check the manufacturer's dimensions and allow additional working space around the structure.
3. Remove grass and organic soil.
Clear vegetation and unstable topsoil from the foundation area.
4. Level the ground.
Remove high spots and fill low areas as necessary.
5. Add the foundation material.
Depending on the chosen foundation, install compacted gravel, pavers, concrete, or a suitable platform.
6. Check the level.
Use a long level or other appropriate measuring tool to confirm that the surface is even.
7. Install and anchor the shed.
Follow the manufacturer's instructions for attaching the shed to the foundation.
Taking time to prepare the base correctly can prevent many installation problems later.
What Happens If a Resin Shed Has No Foundation?
Installing a resin shed without a proper foundation does not necessarily mean it will fail immediately. However, the risk of long-term problems increases.
Potential issues include:
- Uneven settling
- Difficult-to-operate doors
- Misaligned wall panels
- Poor drainage
- Floor movement
- Increased exposure to moisture and mud
- Greater risk of movement during strong winds
- Reduced overall stability
These problems are especially likely when the shed is installed on soft, sloped, or poorly drained ground.
Does Climate Affect the Foundation Choice?
Yes. A foundation choice should be based on local climatic and soil requirements.
Heavy rain areas should be a focus for drainage. If the ground is allowed to freeze and thaw as temperatures change, it may need extra preparation in the freezing temperature zones.
Excessive expansion and contraction can also cause damage to outdoor materials in hot climates.
Anchoring is especially critical in hurricane prone, severe storm or strong wind sites. Please refer to local building codes and manufacturer's specifications of the resin shed.
Frequently Asked Questions
Do resin sheds need a concrete foundation?
Not necessarily. A concrete slab is a strong option, but many resin sheds can be installed on properly prepared gravel, pavers, or another suitable platform.
Can I install a resin shed on uneven ground?
It is better to level the foundation first. An uneven base can affect the shed's doors, panels, floor, and overall stability.
Can resin sheds sit on pavers?
Yes, provided the pavers are installed on a stable, level, and properly prepared base.
Is gravel better than concrete for a resin shed?
There is no "best" or "worst" one of these. Concrete is a firm, very stable surface; gravel may provide a firm, stable surface and easier installation. This will vary depending on shed size, site conditions, budget and climate.
Should a resin shed be anchored?
Anchoring is recommended for many installations particularly light weight sheds with exposure to the winds. Adhere to the instructions of the manufacturer and local regulations.
Final Thoughts
So, is it necessary to put in a foundation for resin sheds? In most cases, yes.
A resin shed is lightweight, water resistant, but still requires a stable, level and well-drained foundation. Depending on shed and site conditions a concrete slab, compacted gravel foundation, pavers or suitable wood platform can all be appropriate.
When it comes to the foundation, be sure not to skimp on it for the greatest long-term results. Good ground preparation will help prevent settling of the shed, enhance drainage and ensure alignment of doors, as well as ensure a firm base for anchoring.
Always follow manufacturer's instructions, recommended foundation size, anchoring needs and local building codes before installation of any resin shed. Taking the time to set a strong footing improves the stability, durability and usability of an outdoor resin shed.
