What is Turf Drainage & How Does it Work?

Artificial grass serves more than just aesthetic purposes, although having a beautiful yard is definitely a bonus. It also needs to be functional, especially when it comes to handling rainwater and pet urine. That’s where turf drainage comes into play. The backing of turf products is designed to drain water in various ways.

Initially introduced in the mid-1960s, artificial grass featured a hole-punch drainage system, with small holes punched in the backing every 4 to 6 inches. This type of drainage system is the most common type of drainage found on turf products, and for good reason, it works. That is unless you have pets, in which case it doesn’t work as well as it should.

One of the most common problems with hole-punch drainage is the infill material clogging the drainage holes. Synthetic grass relies on infill, such as silica sand, to keep the fibers upright and act as a ballast to prevent shifting. The most popular infill material is silica sand, which is a tried and true component of artificial turf installations. However, as time goes by and the turf is exposed to elements like wind, rain, and foot traffic, the sand particles tend to accumulate in the drainage holes, causing clogs.

With a hole-punch backing, liquids tend to pool in the area between the holes, which is usually fine in the case of rainwater. However, when it comes to dog urine, it can result in unpleasant odors. To tackle this issue, turf manufacturers have developed more pet-friendly drainage systems that are now standard in most artificial grass products designed for dogs.

One such innovation is fully permeable backings, which allow water and dog urine to pass through the entire surface of the turf. This edge-to-edge drainage system is commonly used in pet turf applications and areas that require maximum drainage, such as dog runs and designated potty areas.

Proper Sub-Base & Pre-Installation Site Prep Matters

Sub-base material and pre-installation site preparation are critical for ensuring efficient drainage in artificial turf installations. The sub-base material, typically made of crushed aggregate or similar permeable substances, serves as a foundational layer that facilitates water movement away from the turf surface. Unlike native soil, which can be compact and retain moisture, these materials are designed to allow water to filter through quickly and efficiently. This is especially important in areas prone to heavy rainfall or with poor natural drainage, as it prevents water from pooling on the surface, which can lead to issues like mold, mildew, and a breakdown of the turf backing over time.

Pre-installation site preparation, including grading and leveling the area, is equally important for drainage. Proper grading ensures that the surface is sloped subtly to direct water away from buildings or pooling areas. Without this, even with a permeable sub-base, water might not drain effectively, leading to accumulation and potential damage. Leveling the site ensures a uniform thickness of the sub-base, which is essential for consistent drainage across the entire turf area. Together, the right sub-base material and thorough site preparation create a system that efficiently manages water, maintaining the turf’s integrity, appearance, and safety while reducing maintenance needs.

Types of Turf Drainage Systems

Below is a brief overview of the two most common types of turf drainage systems that you’ll come across while researching or shopping for artificial grass. Each turf backing has is advantages and disadvantages. It’s up to you to decide which turf backing you want on your artificial grass.

Hole-Punch Backing (Perforated)

A perforated or hole-punch backing is the most common type of drainage found on turf products. It consists of holes that are punched through the polyurethane backing that are spaced 4” – 6” apart. It’s a reliable and time-tested system for draining liquids from artificial grass. Hole-punch turf backings drain water at a rate of 50 – 300 inches of water per hour.

When installing artificial turf with a hole-punch backing, contractors may offer to incorporate a system like AirDrain, which creates a 1-inch air void underneath your artificial turf. By elevating the synthetic turf, the water can drain more easily through the holes, and the air is allowed to circulate, keeping surface temperatures lower and discouraging the growth of any contaminants.

Hole Punch Turf Backing
Fully Permeable Backing

Flow-Through Backing (100% Permeable/Non-Perforated)

A non-perforated or fully permeable “flow-through” backing is the newest, most advanced backing technology on the market. Synthetic turf products with flow-through backings have 100% permeability, allowing liquids to drain uniformly throughout the turf instead of through regularly spaced holes. This makes it the most efficient type of turf drainage system resulting in an unprecedented drainage rate of hundreds of inches per hour.

The efficiency of turf products with edge-to-edge drainage makes it a popular choice for pet-friendly installations, playgrounds, and sports fields. Because the entire backing of the artificial turf is permeable, water and dog urine are able to pass through any point in the backing.

What Causes Poor Artificial Turf Drainage?

While it’s true that synthetic grass drainage is infinitely superior to its natural grass counterpart, it is not without its own drainage concerns. Any artificial grass surface installed securely and professionally will ensure maximum drainage after every use; however, you’ll still need to be aware of factors that could hinder the effectiveness of your synthetic turf drainage system:

• Installation errors – Turf that’s improperly installed and misplaced can result in blocked drainage. Ensure that your installer’s measurements are calculated precisely for effective drainage.
• Surface quality – Surfaces that aren’t level can lead to natural puddles, hindering the efficacy of your turf’s drainage. Additionally, clay-based soil can block drainage due to its density.
• Infill – Finding the right amount of infill is essential to effective drainage. Too much infill and your drainage will be blocked; insufficient infill will lead to an improper installation of your synthetic turf base.

How To Prevent Poor Drainage

Understanding your landscaping is the first step toward preventing drainage issues. Ideally, the best lawn for effective will have soil that naturally drains water, avoiding any intensive labor on your end. If you know that your yard is prone to water buildup, it may be best to consult your synthetic grass installer to find the best solution.

How To Ensure Your Artificial Turf Drains Properly

The backing on a turf product isn’t the only important aspect of efficiently draining water or dog urine. It’s also extremely important that the sub-base of your installation be permeable. Passing through the backing of turf, regardless of the type of backing is only the most visible part of the drainage system. What’s underneath your turf installation is equally, if not more important to ensure a reliable and efficient drainage system.

Finding a reliable and experienced synthetic turf installer is the best way to ensure that your turf installation is equipped with the best drainage system for your needs. One thing they’ll do is recommend a drainage-friendly sub-base – using the proper sub-base will do away with any drainage problems you could encounter. If your lawn has a surface that can hinder drainage, your installer can remove it and replace it with a higher-performance sub-base material, such as class II road base, decomposed granite, or crushed miscellaneous base.

Depth and material requirements will vary depending on your location. We recommend installing no less than 3” of Class II Road Base on every artificial grass installation. Class II Road Base is a combination of larger and smaller crush and decomposed granite, ensuring the best drainage possible. As a general rule of thumb, the larger the base material, the better the drainage.

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