Demountable Flood Barriers: The Complete UK Guide

What Are Demountable Flood Barriers?

Demountable flood barriers are removable flood defence systems that can be deployed when flooding threatens and stored away when not needed. Unlike permanent barriers, they don't alter the appearance of your property when not in use.

They're particularly popular for doorways, garage openings and commercial premises where a permanent barrier would obstruct daily access.

Types of Demountable Flood Barriers

Aluminium Panel Barriers

The most common type. Lightweight aluminium panels slot into permanently fixed channels on either side of an opening. They can be deployed in minutes and withstand significant water pressure. Typical protection height: 600mm-1200mm.

Door Barriers

Purpose-built for standard doorways. A single panel or flip-up barrier that attaches to the door frame. Some models are hinged and fold flat against the wall when not in use. Ideal for front doors, back doors and internal flood compartmentalisation.

Modular Panel Systems

For larger openings like garage doors, shop fronts and loading bays. Multiple panels stack together to create a continuous barrier. Can protect openings up to 6 metres wide and 1.2 metres high.

Self-Rising Barriers

Automatic barriers that deploy when floodwater reaches them. No human intervention needed — ideal for unoccupied properties or businesses that need 24/7 protection. More expensive but eliminate the risk of late deployment.

How Much Do Demountable Flood Barriers Cost?

Prices vary by opening width, protection height and specification. GDCG provides free surveys with no-obligation quotes.

Government Grants for Flood Barriers

The UK government's Property Flood Resilience (PFR) scheme offers grants of up to £5,000 per property for flood defence measures, including demountable barriers. Eligibility depends on your property's flood risk history and location.

Your local council or the Environment Agency can confirm whether your property qualifies. GDCG can help you navigate the application process and ensure your chosen barriers meet the grant requirements.

Installation and Maintenance

Installation

Most demountable barriers require permanent fixing channels to be installed in the wall or floor on either side of the opening. This is a one-time installation that takes 2-4 hours per opening. The channels are discreet and don't significantly alter the appearance of your property.

Storage

When not in use, barrier panels are stored flat. A single door barrier takes up about the same space as an ironing board. Larger modular systems need more storage but most homeowners keep them in a garage or shed.

Maintenance

Demountable barriers need minimal maintenance. We recommend:

• Testing deployment every 6 months
• Checking rubber seals for wear annually
• Cleaning aluminium panels after each use
• Replacing seals every 3-5 years

How to Choose the Right Barrier

Consider these factors:

1. Opening width — Wider openings need panel or modular systems
2. Protection height — Match the barrier height to your property's flood risk level
3. Deployment speed — Can you deploy in time? If not, consider self-rising options
4. Storage space — Larger systems need somewhere to store panels
5. Budget — Factor in potential government grant contributions
6. Frequency of use — Frequent flooding may warrant permanent solutions instead

Why Choose GDCG?

As specialist flood defence installers based in Grantham, we cover the East Midlands — an area with significant river and surface water flood risk. We supply and install barriers from leading manufacturers including Nautilus and Lakeside Flood Solutions.

Every installation starts with a free, no-obligation site survey where we assess your specific flood risk and recommend the most appropriate solution.

Check your property's flood risk with our free online tool, or contact us to arrange a survey.