When installing decking on uneven ground, it’s essential to create a stable and level base to ensure the longevity and safety of the structure. Here are some common methods and supports used for decking on uneven ground:
Concrete joist Footings
Poured concrete bases that provide a solid and stable foundation for deck posts, concrete footings provide a solid and stable base for decking.
Pros:
- High Stability: Excellent support and stability for large or heavy decks.
- Durability: Long-lasting and resistant to shifting or settling.
- Code Compliance: Often required by building codes for elevated or attached decks.
Best For: Small & Large, permanent decks, especially those attached to a house.
Installation Process
Here’s a basic outline of the installation process:
- Mark the Deck Area: Outline the area where the deck will be installed.
- Dig shallow holes for the footings: Dig shallow holes at regular intervals.
- Lay dry Cement mix: Pour dry cement mix into the holes to create footings.
- Install Post Anchors: Place post anchors into the cement mix to hold the deck blocks.
Adjustable Plastic Deck Supports (Deck Risers or Pedestals)
Adjustable deck supports, also known as deck risers or pedestals, allow for precise levelling of the deck surface:
Cons:
- Load Limitations: May not support as much weight as concrete footings, plastic will perish over time.
- Material Durability: Often made of plastic, which may not be as durable as other materials like metal or concrete, potentially degrading over time due to weather exposure.
Installation Process
Here’s a basic outline of the installation process:
- Position the Supports: Place adjustable supports at regular intervals under the decking framework.
- Adjust Height: Twist or screw the supports to raise or lower the decking to the desired level.
Post and Beam Construction
This traditional method involves creating a framework of posts and beams to support the decking.
Pros
- Durability: Long-lasting and stable foundation.
Cons
- Complex Installation: Requires precise measurements and alignment.
- Labour Intensive: Significant effort needed for digging deep holes and setting posts.
Installation Process
- Install Posts: Set posts in concrete footings at regular intervals.
- Attach Beams: Secure horizontal beams to the posts to create a level framework for the decking.
Ground Screws
Ground screws are a modern and efficient alternative to concrete footings, especially useful for uneven terrain.
Pros
- Minimal Excavation: No need for extensive digging.
- Quick Installation: Fast to install with the right equipment.
- Environmentally Friendly: Less disturbance to the ground compared to digging.
Cons
- Special Tools Required: May require special machinery or professional installation.
- Soil Compatibility: Not suitable for all soil types, especially very rocky or extremely soft soils.
Best For: Projects requiring minimal ground disturbance and quick installation.
Installation Process
- Screw into the Ground: Use a machine or hand tool to screw the ground screws into the earth at regular intervals.
- Attach Deck Framework: Secure the decking framework to the tops of the ground screws.
Concrete Decking Blocks
Precast concrete Decking blocks can be used as a simple and quick solution for supporting decking.
- Ease of Use: Simple and quick to install with no curing time needed, D.I.Y friendly save on professional costs.
- Cost-Effective: Generally less expensive than poured concrete footings, no waiting for concrete to set. The whole job can be completed in the same day.
- Mobility: Easy to move and reposition if needed.
Installation Process
- Place Blocks: Lay concrete blocks on the ground in a grid pattern to support the deck framework.
- Adjust for Level: Use shims or other materials to adjust the height of the blocks and level the decking.
Installation Process
- Prepare the Ground: Level the ground as much as possible.
- Use Pavers or Concrete Blocks: Place pavers or concrete blocks directly on the ground to support the deck.
- Build Frame on Supports: Construct the decking frame on top of the pavers or blocks.
Summary
- Concrete Footings: Best for stability and durability; ideal for large, permanent decks.
- Adjustable Deck Supports: Plastic will perish over time also the base of the plastic feet are small and may sink.
- Ground Screws: Quick and minimal disturbance; Professional labour required, can be complexed if you have not had the ground checked for water pipes and cables. ideal for projects needing fast setup but not suitable for all soil types.
- Concrete Blocks: Easy and cost-effective; good for small and large freestanding decks.
- Post and Beam Construction: Strong and versatile; suitable for large decks but labour intensive with a lot of digging required.
- Floating Deck: Flexible and easy to install; best for small, low-to-ground decks using Decking blocks
Tips for Success
- Site Preparation: Clear and prepare the site by removing vegetation and debris. A layer of landscape fabric can help prevent weed growth.
- Drainage Considerations: Ensure proper drainage by sloping the ground slightly away from structures.
- Building Codes: Check local building codes and regulations for deck construction to ensure compliance.
- Safety: Wear appropriate safety gear and consider hiring a professional if you’re unsure about any part of the process.
Each of these methods can be adapted to suit the specific requirements of your site and the design of your deck.