Spring is the perfect time to start outdoor projects. As the weather improves, many homeowners begin planning new decks so they can enjoy their garden during the warmer months.
Before starting a decking project, it is important to make sure you have all the materials ready. Missing items can delay the build and lead to unnecessary trips to the builders merchant.
This guide provides a simple decking materials checklist to help you prepare for your spring decking project. It covers the main structural materials, surface boards, ground preparation, and tools needed to complete the job properly.
Planning Your Decking Project
Before purchasing materials, you should measure the area where the deck will be installed. Knowing the deck size allows you to calculate how many boards, joists, and fixings will be required.
Start by measuring:
the length of the deck area
the width of the deck area
the height from the ground if the deck will be raised
Once you have the measurements, you can estimate the total square metre area of the deck and plan your materials accordingly.
Deck Structure Materials
The frame is the structural base of the deck. It supports the decking boards and ensures the deck is strong enough to carry weight.
Typical structural materials include:
Decking joists
Joists form the main framework that supports the decking boards. They are normally spaced at 400 mm centres for timber decking.
Deck posts
Posts support raised decks and help transfer the weight of the structure into the ground.
Joist hangers
Joist hangers are metal brackets used to secure joists to the outer frame. They add strength and help keep the frame square.
Exterior grade screws or bolts
Strong exterior fixings are required to secure the frame components together.
Using pressure treated timber for the frame is recommended as it protects the wood from moisture and rot.
Deck Surface Materials
The surface of the deck is created using decking boards that are fixed to the joists.
Surface materials usually include:
Decking boards
These boards create the walking surface of the deck. Timber decking boards are the most common option for garden projects.
Fascia boards
Fascia boards are installed around the edge of the deck to hide the frame and create a neat finish.
Decking screws
Special decking screws are used to fix the boards to the joists. Each board should normally be secured with two screws at every joist.
When installing decking boards it is important to leave a small gap between each board to allow for expansion and drainage.
Ground Preparation Materials
Preparing the ground properly is essential for a long lasting deck. Good ground preparation helps prevent moisture build up and improves stability.
Common ground preparation materials include:
Weed membrane
Weed membrane is placed under the deck to stop weeds growing through the structure.
Gravel or sub base
A layer of gravel helps improve drainage and keeps moisture away from the timber frame.
Concrete pads or deck blocks
These are often used to support deck posts and provide a solid base.
Taking time to prepare the ground will improve the lifespan of your deck.
Decking Tools Checklist
In addition to materials, you will also need the correct tools for the job.
Typical decking tools include:
tape measure
spirit level
circular saw or handsaw
drill and driver
pencil and square
string line for layout
Having the right tools ready before starting the project will make installation much easier.
Decking Board Spacing Tips
When installing decking boards it is important to allow small gaps between each board.
Most decking boards require a spacing of 5 to 8 millimetres.
This gap allows:
water to drain through the deck
air to circulate beneath the boards
timber to expand and contract naturally
Using small spacers during installation can help maintain consistent gaps.
Common Decking Material Mistakes
Many DIY decking problems occur because of incorrect materials or missing components.
Common mistakes include:
using untreated timber for the frame
spacing joists too far apart
using the wrong screws for outdoor use
failing to prepare the ground properly
Following a proper materials checklist can help avoid these issues.
Example Decking Materials List
For a typical medium sized garden deck you may need:
decking boards
decking joists
deck posts
joist hangers
decking screws
weed membrane
gravel or sub base
The exact quantities will depend on the size of your deck and the layout of the frame.
Frequently Asked Questions
How many decking boards do I need per square metre
Most decking projects require approximately seven boards per square metre depending on board width and spacing.
What timber should I use for decking frames
Pressure treated timber is recommended for decking frames because it offers better protection against moisture and rot.
Do I need weed membrane under decking
Weed membrane is highly recommended as it prevents weeds from growing through the deck structure.
Can I build decking directly on soil
It is better to use gravel or concrete pads to create a stable and well drained base.
Final Thoughts
Building a new deck can transform a garden and create a space for relaxing or entertaining during the warmer months. Preparing the correct materials before starting the project will help ensure the installation runs smoothly.
By following this decking materials checklist you can confidently plan your spring decking project and build a deck that will last for many years.
check out our Decking joist spacing guide > to help you complete your project
You can also use our decking calculator to quickly work out exactly how many decking boards you need for your project. It helps you plan accurately, avoid overordering, and makes the whole process much easier before you buy.
Get in touch for competitive trade prices
