Controlling the flow of water, protecting drainage channels from large debris, as well as helping avoid flooding ; drainage grates are an essential part of any building & infrastructure project.
What are drainage grates?
Drainage grates are covers that have holes, slits or other openings to permit water to flow through them and into the channel below. They can be made out of cast iron, galvanised steel, stainless steel, stone and other materials.
Types of Drainage Grates
Depending on the installation location & application, grates are available in many different types.
- Trench grates are usually supplied in 500mm or 1M lengths, and are available in a range of widths & materials
- Curved GratesCurved grates are sometimes necessary to follow the curve of a pool, or surrounding area.
- Tree grates are installed around the base of trees in urban environments. They serve multiple purposes, primarily protecting the tree's root system from foot traffic, vehicles, and other potential damage while allowing water, air, and nutrients to reach the roots.
- Sump grates are typically a square grate that covers a pit.
- Bespoke grates may be required when a space has certain aesthetics or unique layouts.
How do drainage grates work?
Many drainage grates systems require a drainage grate to act as a cover for the channel. Explanation of the function of drainage grates below.
Function
- Preventing debris blockageGrates cover the opening of the drainage channel to help keep large pieces of litter or debris out of the channel to prevent clogging of the pipes or channels
- Water FlowGrates allow for water to flow into the drainage system.
Design & Structure
- Shape & SizeGrates are available in a wide range of sizes. This includes the abililty to customize grates to suit individual projects.
- Openings & PatternsVarious size patterns & openings are available for different project needs. Grates can have decorative patterns.
- MaterialsGrates are typically constructed out of durable materials such as polypropylene, stainless steel or cast iron. There are other options such as stone, however the ideal grate will differ project to project. Conditions such as topography, rainfall, foot traffic, vehicles and aesthetics can affect the grates chosen.
Installation & Maintenance
- InstallationEnsure grates are installed correctly with locking systems secure to prevent damage or shifting
- MaintenanceRegularly check grates to ensure debris, dirt or leaves have not become clogged. This will help prevent water backup & pooling.
Safety Considerations
- Durability & StrengthEnsure grates that feature reinforcements such as lockdowns or anchors are properly installed to ensure strength & durability.
Drainage Grate Materials
The materials of the drainage grate significantly impacts its performance, durability and appearance. Here’s an overview of popular options
- Galvanized steel grates offer excellent corrosion resistance and durability, making gal grates ideal for outdoor applications like driveways and parking lots. They are cost-effective, strong enough for moderate to heavy loads, and provide long-lasting performance.
- Known for its robustness, cast iron grates are typically used in high traffic zones, such as roads and industrial sites. Cast iron grates are often are heavier than other materials, providing stability & durability.
- A modern option, stone grates offer a natural aesthetic. Often used in high end landscaping projects to ensure the drainage blends perfectly with the environment.
- For areas requiring superior corrosion resistance, stainless steel is the go-to material. It is particularly suited for coastal regions or chemical processing facilities, where exposure to harsh elements is common. In addition to its strength, stainless steel has a sleek modern appearance. Cast Iron
- Polypropylene grates are affordable, making it perfect for residential applications like gardens or driveways (if the load class is suitable). Polypropylene is resistant to chemicals and rust, but it may not be suitable for high load areas.
- Thinner but durable, pressed metal grates are often used in areas requiring minimalist or modern aesthetic. These are suitable for areas with light to moderate traffic and are favoured for their sleek, contemporary appearance.
For more guidance on selecting the right material for your trench drain, check out our article on comparing trench drain materials
Design Considerations
Understanding your specific drainage requirements, the layout of your outdoor space, and the overall aesthetic of your property can all play a crucial role in determining the most suitable trench drain system.
- Water FlowOne of the primary considerations is the volume of water that needs to be managed. Factors such as the size of your property, the slope of the land, and the frequency and intensity of rainfall in your area will all influence the required capacity of your trench drain system. Choosing a drain that is too small may lead to water overflow and potential flooding, while an oversized drain could be an unnecessary expense.
- AestheticsThe aesthetic of the trench drain is another important consideration, as it needs to complement the overall design of your outdoor space. Grate styles, colors, and finishes can all be customized to suit your preferences and create a cohesive look. For a more modern, minimalist aesthetic, you might opt for a linear drain with a sleek, stainless steel grate. If you’re looking for a more traditional or rustic vibe, a channel drain with a cast iron or decorative metal grate could be the perfect fit.
- Anti-Slip OptionsAn important option if the drain is installed in high traffic areas.
- Load class refers to the appropriate load rating that a grate can withstand. Learn more about load ratings in our article.
- SecurityMost grates have a lockdown mechanism to ensure the grate remains rattle free & secure.