Flood Barriers – Flood Technologies Nautilus

Nautilus Flood Barriers
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Flood Barriers – Flood Technologies Nautilus

A flood barrier is a removable flood defence product, which can be quickly deployed if there is a flood warning in your local area. The barrier slides into two permanent upright channels, which will be fixed to the wall either side of your door. When required, a flood barrier can be quickly installed by sliding the barrier panel into the upright channels and locking into place. It is worth noting, a flood barrier is often referred to as a flood gate or a flood control barrier in the UK. Flood barriers for doors are versatile products and can be installed on commercial or residential properties.

There are two main types of flood barriers for doors: composite or aluminium flood barriers. Each type of flood barrier has its own advantages, but the first step will be to take accurate measurements as this will determine the type of flood protection. As a general rule, the type of flood barrier that will fit your door is:

Single door – Nautilus 200/300 Flood Barrier

Double door – Nautilus 200/300 Flood Barrier

Sliding door – Nautilus 200/300/400 Flood Barrier

Garage door – Nautilus 200/300/400 Flood Barrier

Driveway – Nautilus 200/300/400 Flood Barrier

Roller Shutter – Nautilus 400 (Heavy Duty) Flood Barrier

The first step is to measure your door to determine the type of flood barrier that can be fit to your door.


Measuring a flood barrier for door

The first step to determine which flood barrier is suitable for your door is to measure the width. To take the measurement you should take the brick to brick measurement i.e. from the outer edge of the door frame where it meets the wall.

If the door width is under 1.5m, you will have the option of an aluminium barrier or a composite barrier (Flood Defender Wall). If the door width is over 1.5m, your only option would be an aluminium flood barrier. The reason is the aluminium flood barrier is a stronger and more robust material, and can therefore withstand greater water pressures than composite flood barriers.

Another advantage of an aluminium flood barrier is the height and width can be manufactured to your requirements. The barrier will be manufactured and cut to fit a specific door. In contrast, the composite flood barrier is a set panel size (either 1.5m wide or 1m wide), but you can cut down the panel to size on site. This is a DIY flood barrier, and can easily be fit yourself.

There are a few other things to consider:


  1. Is the door open in or open out?

The first thing to consider is whether the door is open in or open out. If the door is open in, then the flood barrier should be fit externally. If the door is open out, then we would recommend fitting the barrier inside the door.

If you are fitting the flood barrier inside your home, you need to make sure you are fixing to a solid wall i.e. not plaster board. Check there is sufficient space and no obstructions on the side of the door where the barrier will be fit.

With a flood barrier for home, you may also want to consider whether you will deploy the barriers when you go on holiday. If you are going to install them when you are away, then you may want to consider having the barriers fit internally so passer-by’s do not know that your house is empty. It is quite common for people to install flood barriers for garages internally for this reason.


  1. Where will the upright channel fix to the wall?

You can fix the upright channels on the face of the wall or in the reveal where the door sits. Depending on the type of barrier will depend on the space required in the reveal. The minimum recommended space for each barrier is below:

Nautilus Aluminium Flood Barrier 200/300 – 50mm

Nautilus HD Aluminium Flood Barrier 400 – 80mm

If you have enough space to fit in the reveal, you then need to check the door has no cill that could obstruct the barrier being put in position. If there is a cill that sticks out at the bottom of the door, you will need to fit the barrier on the face of the door. You may also need to add a packer to the fixing (see no. 5 for more details). This may require additional length, which may mean you need to install an aluminium flood barrier. Keep an eye out for any cables, pipes or obstacles that could get in the way of the barrier fixing to the wall.

If the door is a sliding door, we would recommend installing the flood barrier with a face fix as there is unlikely to be enough space in the reveal.


  1. How high can I have a flood barrier for a door?

The next step is to think about the required flood protection height. Composite flood barriers only come in 600mm high panels, whereas aluminium flood barriers are available in 200mm, 300mm or 400mm high increments.

In the UK, the recommended flood barrier standard is 600mm high, however this may not be suitable in all situations. For example, you may suffer when storm water causes drains to overflow, and you only need a 200mm barrier to deflect the flood water away from your house. In this situation, an aluminium barrier may be more suitable. In some circumstances you may require a flood barrier over 600mm high. For example, your door may be below ground level. In this situation, you would need to install an aluminium flood barrier, which can be manufactured up to 1600mm high.


  1. Flood Barrier Storage

The next thing to consider is the storage of the barrier. As it is usually installed prior to a flood event, the barrier will be kept in storage most of the time. The size of each board may make one type of flood barrier more suitable than another. The size of each panel is below:

Composite flood barrier – 600m high

Nautilus Aluminium Barrier – 200mm & 300mm high

Nautilus HD Aluminium Barrier – 400mm high

With the Nautilus Aluminium Barrier for a single door 1000mm wide, and with flood protection 600mm high, you would have three panels 200mm in height or two panels 300mm in height. This may be easier to store than a single panel 600mm high (as in with the Defender Wall flood barrier).


  1. Do you need any packers?

A packer is only available for an aluminium flood barrier, and is an additional aluminium block which is welded to the face or reveal fixing. This will mean the fixing will be set further off the wall, which may be necessary to get around the cill of a door or a grate in front of the door. Packers can come in a variety of sizes, with the most common 25mm and 50mm.

If you are fitting internally and you have a skirting board, you would need to cut the skirting board back to the wall and request a packer on the fixing to ensure the barrier can be slotted in.


Flood Barrier Advantages include:

Reliability – unlike doors that can get damaged due to day to day use, flood barriers are reliable and simple to use. As they are rarely deployed, they are much more reliable than flood doors.

Cost – the cost of flood barriers is significantly less than flood doors.

Bespoke made to any height or width – it is possible to create a flood wall from demountable aluminium barriers to any length. The versatile nature of flood barriers make it a better product to protect your home from flooding. Every door is slightly different and therefore requires a bespoke solution.


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