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How to ensure you chose the right guttering for your home.

It’s crucial to pick the right gutter size for your commercial or industrial structure. The finest protection for your house will come from a gutter system that is the right size, and it will also guarantee that your rainwater pipes are both manageable in size and shape.

So how do you determine the size of your gutters? The response is based on several variables. Here are some pointers for picking the appropriate gutter size for your commercial or industrial structure:

Evaluate the Location’s Rainfall Intensity-

You must first consider how frequently it rains where your building is located. You will require a larger gutter size if you live in a region where it rains frequently as opposed to one where it rains infrequently. This is since heavy rain can result in more water flowing into your gutters than a few small droplets.

A lot of rain falling on your roof at once can also put more strain on your gutters than if there were a few light rain events spread out throughout the day. If the average annual rainfall is greater than one inch per hour, it is wise to use a bigger gutter size (this number varies depending on where you live).

Consider Local Regulations –

There are limitations on how much of a property’s surface area may be covered with landscaping or vegetation in some areas. If your town has such rules in place, you might need to adjust the size of your gutters. To prevent tree branches and leaves from blocking the downpipes, you must also leave enough space between trees and structures.

For more information, consult your local authority or the Planning Portal.

Think About Your Roof Pitch –

The pitch of your roof is another factor to consider when selecting a gutter size. A larger gutter is necessary for a greater pitch since it must manage more water simultaneously. In contrast, a lower pitch necessitates smaller gutters because less water will drip at once.

Think About the Area Your Roof Covers – 

The covering area, or how much space the building takes up, is a significant component in deciding the number of gutters needed for your property.

This will guarantee that the amount of linear feet of gutters you require is measured accurately. To calculate the size of your roof in square feet, utilise an internet calculator or contact a professional contractor to inspect the structure.

Getting professional help –

Before proposing a certain gutter size, it is important to employ a specialist to evaluate your property. To choose the suitable size of gutter for your house, for instance, you must know how much water pours off your roof during periods of heavy rainfall. Once more, a professional will assist you in choosing the proper gutter style and size.

The advantages of installing the correct gutter sizes…

In general, commercial and industrial buildings are made to be watertight. As a result, there is no way for rainwater or other liquids to enter the structure. The base of the structure will often be equipped with a drainage system so that any extra water can be removed. However, issues could arise if the gutters are not fitted properly.

Therefore, it’s crucial to install the proper gutter widths if you have an industrial structure. The following are some advantages of installing gutters of the appropriate sizes:

Lower Damage

Installing gutters that are the wrong size might seriously harm your home. The most frequent problem is that gutters that are either too big or too tiny may let water leak out into your surroundings. If this isn’t fixed right away, it can cause significant damage over time. This may be avoided, and your house will be shielded from water damage in the long term by installing gutters that are the suitable size.

Increasing the value of your property

Installing gutters that are the right size is one approach to boost the value of your home. Additionally, when prospective buyers see how well-kept your building is, they will be more inclined to buy it than they would be if they saw serious problems like dripping gutters, peeling paint, and broken windows or doors.

Superior Drainage system

Better drainage is the most evident advantage of installing the proper-sized gutter. The amount of water that a gutter can hold depends on its size. You need a larger gutter to accommodate the extra water if there is a lot of rain in your location or if there are many trees nearby that cause leaves and other material to clog your gutters. Due to the ample space, they provide for run-off, large gutters also aid in preventing flooding.

The common designs round in guttering…

Every house needs a gutter, which plays a crucial role. Its job is to gather rainfall from the roof and guide it away from the structure. There are many different designs for gutters, and each one has advantages and disadvantages. Some are more adapted than others to circumstances.

There are different types of gutter designs available at PolyGutter:

Victorian Ogee Gutters-

Two slopes make up the Ogee gutter, which meet at an angle at the top before sloping downward once more. The Ogee is so called because it resembles an ogee curve or an ogee arch, two common architectural elements used in elaborate structures like churches and cathedrals.

Box Gutters –

The most popular kind of gutters are box gutters. They are built of various materials and have a straight downpipe with a 90-degree elbow at each end. They are frequently used with steel metal box downpipes that match. A box gutter’s rigid, strong structure that can resist all weather conditions is by far its greatest asset.

Half round Gutters –

The half-round gutter has a straightforward circular shape and an all-around slope. As well as flat roofs, this kind of gutter works well for tiny and inclined roofs. In accordance with your preferences and financial constraints, it can be formed of steel, cast iron, or aluminium.

Beaded half round gutters-

On either edge of the Beaded Half Round Cast Iron Gutter profile, a decorative ‘bead’ protrudes. The North of England and Scotland are two regions where beaded half round cast iron guttering is particularly common.

Beaded Deep run –

For the larger flow capacity required in locations with high rainfall, the Beaded Deep Run Cast Aluminium Gutter profile is deeper. Popular in Scotland and the North of England is the protruding decorative “bead” on either edge.

Moulded gutters –

Moulded gutters are supported by a stone corbel and are made of cast iron like half-round gutters. The contoured edge of a cast iron gutter or rhone pipe is occasionally referred to as OG (Ornamental Gutters).

Potential Damages from Improper Gutter Sizes

A gutter system is a cheap and efficient way to keep water out of your house or other structure. However, if the gutters are the wrong size for the building, this could lead to issues and even damage to the structure.

Inappropriate gutter sizes may result in the following harms:

  • Property damage

Your property may be affected if the building’s walls are exposed to an excessive amount of water. Additionally, it will make it appear unkempt and ugly, which may reduce the number of individuals who visit your property or premises. In addition, too much rain will increase the likelihood that mold will begin to appear on walls and ceilings, which may be very detrimental to both health and aesthetics. Additionally, if left unchecked, this might result in dampness in specific building sections, which over time can harm the structure.

  • The intrusion of water into your building

Through the gutters, water might get inside, harm electrical wiring, or even get inside your structure. When there is strong pressure from rain or wind, this is very risky.

  • Potential Flooding

The water will overflow onto the ground if your roof cannot drain correctly due to inadequate guttering. Even little rain can cause issues if there is not enough room for it to entirely go into the drains, which is more likely to occur during major rainstorms.

  • Damp and mould growth

Mould development is another significant issue that can arise when guttering is installed poorly, much like water on the ground. Mold is likely to begin to form in the gutter’s inside or along its side if water accumulates there and doesn’t drain away. Moisture, food, and oxygen are the three things that mould needs to flourish. When there is a drainage issue, all three are present!

For any more information or support on selecting the right guttering for your application, do not hesitate to get in touch at

Drainage Calculator

From Alumasc

Alumasc’s leading Drainage Calculator allows Architects, Specifiers and Building Engineer’s to design and quantify all their Rainwater Drainage requirements using this dedicated software.

Key Features:
  • Category 2 and 3 Flat Roof Drainage linked to local rainfall data.
  • Eaves Drainage gutter sizing and pipe calculator for cast and contemporary gutter types.
  • Slotdrain Hydraulic surface water drainage calculator.
To request a copy email

Note: The Alumasc range of calculation tools on the Drainage software are based on BS EN 12056 and it is your responsibility to ensure that the data has been correctly interpreted. Architects, Engineers and other users of this software must satisfy themselves in respect of the adequacy of the design. For complicated calculations, please contact the Alumasc Rainwater or Drainage technical team on 01536 383810 or who may be able to assist.

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