What are gutters? Roles, types & effective installation

Gutters may seem like a small detail in roof structures, but they play a vital role in channeling rainwater, preventing leaks during heavy rainfall, protecting the entire building. So, what exactly are gutters, how are they structured, what types exist, and how much does installation cost? Let’s explore all these details with BMB Steel in the article below.

1. What are gutters?

Gutters (also known as water gutters, drainage gutters, rainwater collection gutters, etc.) are an effective water-channeling solution, designed in the form of pipes or slide-shaped troughs. Gutters are typically installed directly under the roof edge to catch rainwater and direct it down to the drainage point. Thanks to this, buildings can avoid water stagnation that may cause leaks, seepage, or rainwater overflowing back inside.

Gutters are manufactured in various sizes, materials (plastic, aluminum, stainless steel, corrugated steel), suitable for different types of constructions such as houses, factories, plants, etc.

Read more: Standard industrial factory construction process

2. Structure and working principle of gutters

An effective gutter drainage system typically consists of the following components:

• Gutter: Installed along the roofline to collect all rainwater flowing down.
• Outlet: The connection between the gutter and the downspout, ensuring water from the gutter is directed into the vertical pipe.
• Downspout: Extends from the outlet down to the underground drainage system.
• Gutter hanger: Keeps the gutter fixed and stable, minimizing shaking or displacement.
• Gutter guard/leaf screen: Prevents leaves, debris, insects from clogging the system.

The working principle of a gutter system is simple yet highly effective: Rainwater from the roof flows into the gutter, runs naturally toward the outlet due to the slope, then enters the downspout and is discharged outside.

During the design process, the placement of downspouts must be calculated in coordination with the roof structure. For every 6-12 meters of gutter length, at least one outlet should be installed at the lowest point to prevent water buildup. Improper installation can cause water stagnation, leading to lateral pressure, gutter breakage, or leakage. In particular, all joints between the gutter, outlet, and downspout must be tightly sealed to ensure no water leakage.

3. Common types of gutters

On the market today, gutters are manufactured in many different types. Below, let’s take a look at 2 popular classification methods: based on material and design style.

3.1. Classification by material

Composite plastic gutters

Composite plastic gutters are considered the most durable among current drainage gutters. With a structure combining polyester and fiberglass, they are resistant to rust, mold, easy to clean, and simple to maintain. However, due to their high cost and limited design options, composite gutters are not yet widely used.

PVC gutters

PVC plastic gutters are popular because of their low price, eco-friendliness, and safety for health. They come in diverse colors, are lightweight, easy to transport, and allow for quick installation, making them suitable for many residential projects.

Stainless steel gutters

Stainless steel gutters are one of the most favored and trusted products today, manufactured from stainless steel grades 201, 304, 316. They are resistant to rust, corrosion, oxidation, while also withstanding harsh weather conditions. In addition, stainless steel can be rolled thin and bent flexibly to fit different roof designs.

Alloy gutters

Alloy gutters are characterized by their lightweight yet strong structure, capable of withstanding sun, rain, storms. They are also reasonably priced, easily accessible, suitable for a wide range of projects.

Corrugated steel gutters

Corrugated steel gutters (made from galvanized or color-coated steel) account for over 90% of construction projects today. This type of gutter is highly durable, available in various colors, lightweight, and cost-effective. However, the drawback is that they are prone to rust and corrosion when exposed to harsh environments for a long time.

Concrete gutters

Concrete gutters are created using a mix of cement, sand, and stone. They are easy to construct and can be molded to meet specific project requirements. However, to ensure quality, it is necessary to strictly control moisture during production to avoid cracking or damage after use.

3.2. Classification by shape

In addition to material-based classification, gutters can also be divided by shape. Some commonly used gutter models include:

• V-shaped gutters: A common style, easy to install, and convenient for cleaning and maintenance.

• U-shaped gutters: Suitable for roofs with steep slopes, helping maintain stable water flow and preventing overflow.

• Round gutters: Highly appreciated for their aesthetics, often used in modern and luxurious construction projects.

4. Applications of gutters in construction

Gutters are an indispensable part of both residential and industrial projects. With the main function of collecting and channeling rainwater from the roof to the drainage system, gutters help protect the entire building from leakage and mold.

• In residential construction: Gutters are installed to prevent walls, gardens, foundations from being affected by rainwater flowing directly from the roof.
• In commercial buildings, factories, warehouses: Gutters play a vital role in ensuring quick drainage, protecting goods, machinery, providing a safe working environment.
• Aesthetic value: With a wide variety of designs, styles, and materials, gutters not only meet technical requirements but also complement and enhance the overall architectural appearance of the project.

5. Reference gutter price list

The cost of installing and constructing gutters depends on many factors such as material type, size, the specific conditions of each project. Below is a reference price list for your consideration:

Galvanized steel gutter price list

Color-coated steel gutter price list

Gutter fabrication price list by shape & material

Notes:

• Prices may vary depending on actual construction conditions.
• Additional costs outside the contract will be calculated based on market rates and the specific requirements of the project.
• Prices above do not include VAT.

6. Important notes when installing gutters 

To ensure the gutter system works effectively and maintains long-term durability, attention should be paid to the following points during installation:

• Installation must follow the correct procedure, ensuring joints are tight and leak-free.
• Each type of gutter has a different drainage speed, so the slope should be adjusted accordingly to allow smooth water flow.
• A mesh cover should be added to prevent leaves, debris, insects from causing blockages.
• Regular inspection and cleaning are necessary to maintain drainage capacity and extend lifespan.

Gutters play an important role in directing and draining rainwater, protecting buildings from leakage and dampness. Currently, there are many types of gutters available, each with its own advantages, disadvantages, and price ranges to meet the diverse needs of different projects. Choosing the right type of gutter combined with proper installation techniques will help the drainage system operate effectively and improve the building’s lifespan.

If you need advice on selecting gutters and a detailed quotation, please contact BMB Steel. We are always ready to support you, providing durable, efficient, and cost-optimized construction solutions for your project.