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A guide to base requirements for log cabins

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Written byRichard
Posted16/07/2021

When installing a log cabin, one of the most important elements is the base. A good base ensures your log cabin is durable, stable and protected from problems such as splitting, cracking and warping over time. 

Unlike smaller garden buildings such as sheds, log cabins are constructed using interlocking timber wall logs that need to be aligned during installation to ensure the timber and garden building perform well over time. This construction method means your log cabin sits on a solid, level and properly supported base. If the base is uneven or unstable, it can affect the way the logs stack, can cause issues with doors and windows, and lead to structural issues over time.

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A properly constructed base also helps to protect your garden building from moisture and ground movement, keeping your cabin raised above ground level to promote good drainage and supporting the weight of your log cabin. 

In this guide, we’ll explain the key base requirements for your log cabin, why they’re important and the most common options available. Understanding these requirements before installation will ensure you have a log cabin that you can enjoy for years to come.

Why a proper log cabin base is so important

A log cabin is a precise build which means there is very little tolerance in the measurements and fitting. Each log is designed to sit directly on top of each other and interlock at the corners using corner connections and tongue and groove joints along the length of the logs. 

Due to this design, the base acts as a crucial structural element of your log cabin. Every part of the cabin relies on the base being level, square and fully supportive. Unlike many sheds where the floor panel sits directly on the ground, the floor of a log cabin usually sits inside the structure which means the floor is not designed to support the entire weight of the cabin. 

An uneven base can cause a range of problems including: 

  • Windows and doors becoming uneven or gaps appearing 

  • The apex roof not sitting flush with the upper wall, leaving visible gaps 

  • Roof boards not fitting correctly or sitting at an incline 

  • Long term issues such as warping, twisting, straining, cracking and splitting 

Even the smallest variation in the level of the base can cause installation and ongoing issues.

Key requirements for a log cabin base

Before you choose the type of base you want to build, it’s important to consider the essential requirements that every log cabin base should meet. A properly prepared base will ensure the performance of your log cabin throughout its lifetime and provide you with a garden building you can enjoy.

Completely level

A perfectly level base is critical when installing a log cabin. The interlocking structure of a log cabin relies on each log sitting evenly on top of the previous one so, if your base is uneven, it can have a huge impact on the way the interlocking logs fit together. 

Even just a few millimetres can cause problems during installation such as gaps between logs or difficulty fitting doors and windows properly. Taking the time to check and correct the level of your base will ensure installation runs more smoothly.

Square base

As well as level, the base of your log cabin also needs to be square. If it’s out of shape, the walls of the log cabin may not align properly during installation. Checking the diagonal measurements of the base is an easy way to ensure its square before starting installation.

Support the entire log cabin

The outer walls of your log cabin carry most of the load so your base needs to provide support around the full perimeter of your building. If part of the wall sits unsupported, it can lead to the timber sagging or moving over time. This means your base also needs to be at least the same size as the footprint of your cabin.

Stable and durable

A log cabin is a substantial garden structure so the base needs to be strong enough to support it throughout its lifetime. Choosing a solid foundation prevents issues such as ground movement, sinking or settling, water damage and structural stress on the building.

What base do I need for a log cabin?

There are a number of ways to create a suitable base for your log cabin. The best option for your building will depend on factors such as: 

  • The size of your building 

  • The ground conditions in your garden 

  • Your available budget 

  • How you plan to use the cabin 

Here are some of the most commonly used base types for log cabins:

Concrete base

A concrete base is one of the most reliable foundations for a log cabin. A typical concrete base is around 80-100mm thick and created using timber shuttering to contain the concrete while it sets. For larger log cabins, we recommend adding steel reinforcing mesh to strengthen the slab.

Concrete bases provide a strong and durable foundation that requires minimal maintenance but excellent stability for a long lasting, well-built log cabin.

Concrete basesConcrete base 2Steel reinforcing for concrete base

Paving slabs

This is another common method for building a log cabin base. It’s extremely cost effective and easy to build. 

The slabs must be laid on a solid and level foundation, usually consisting of compacted hardcore and sand. It’s essential to ensure all slabs are level and properly supported. When installed correctly, paving slabs provide a stable and durable base for your log cabin installation.

Timber frame base

A timber frame base consists of a timber frame supported by stilts or pads, or even paving slabs positioned at intervals. This is a particularly good option for areas where concrete is just not possible or when there are steep inclines to overcome. Timber frame bases can also create a raised platform which can improve drainage around your building. 

However, the timber frame must still be properly supported, level and strong enough to carry the weight of the cabin.

Timber frame mounting

Foundation beams

Foundation beams are an important part of your log cabin installation. These beams are designed to run around the perimeter of the building, sitting between the first log and the base. Adding this option to your cabin provides the first layer of logs with protection from sitting in any water. Using foundation beams can significantly improve the durability and lifespan of your cabin.  

Learn more in our blog: Installation tips for log cabin foundation beams for more on this part of building your log cabin.

Choosing the right base for your log cabin

Preparing the correct base is one of the most important steps of installing a log cabin. Getting this step right will ensure the installation process runs more smoothly and ensure that your building performs well over time. 

Due to the construction of log cabins, the entire structure depends on the base being level, square and stable. So, whether you choose a concrete base, paving slabs or a timber frame base, you should always ensure the base is completely level and support the full perimeter of your log cabin. 

Planning your base carefully before delivery and installation allows you to ensure you can enjoy your garden building throughout its lifetime with minimal problems. If you’re unsure which base is best for your cabin or garden conditions, please contact our expert customer service team, we’d be happy to provide advice and guidance to ensure your log cabin build runs smoothly from the start.

Further information on installing your log cabin

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