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Green Rodent Proofing Explained

Metex have developed a range of green, non-toxic pest control products sold through respected stockists but before making any purchase, we feel it’s important you use our knowledge base to help choose the right product for your rodent problem.

For rat-proofing your drains, the Metex Nordisk is a world-leading industrial Rat Blocker and the only one to achieve Water Research Centre Approval in the UK, whereas the Metex Ratwall is a cost-effective and robust stainless steel Rat Blocker that is ideal for installation into domestic underground drains.

If your problem is rodents accessing a building through cracks in the walls, the Metex RatTape rodent proofing tape offers an innovative solution with a stainless steel mesh core. Click below to find out more!

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Rats thrive alongside humans and seek warmth, food, and build nests within buildings. They use drains to travel un-noticed into the buildings and also use more obvious entry points such as cracks in the walls. Rats pose a health risk and cause damage to property including being a fire risk as they chew electrical cables.

To proof a building against rodent entry all entry points must be considered and addressed. Blocking obvious entry points such as visible cracks is relatively straight forward, however drains are actually the most common entry point.


Metex provide high quality, effective rodent proofing systems for homes and buildings. We can offer a choice of products to stop rats accessing a building through the drains as well as a robust proofing tape to cover building defects. Rat blockers are available in a range of sizes to suit both domestic and industrial use.


All Metex proofing products are non-toxic. The Rat Blockers effectively stop rats and other rodents passing through drains towards a building whilst allowing them to pass freely downstream. A Metex Rat Blocker allows the drain to function as normal. By installing a Metex Rat Blocker into the drain outlet all upstream branches are protected.

Metex RatTape can be rapidly applied to block a rodent entry point in the building fabric.

Pest Overview

Where there is no obvious access point into the building: check the drains! Use the video to help select a suitable Rat Blocker.

The Metex Nordisk is a world-leading industrial Rat Blocker and the only one to achieve WRc Approval in the UK. The new Nordisk LOCK takes the design further with a locking front flap for total customer peace of mind.

For domestic underground drains, the Metex Ratwall is a cost-effective and robust stainless steel Rat Blocker that is suitable for plastic, clay and cast iron drains.

With a stainless steel mesh core, RatTape is an effective proofing product to consider where the rodents are gaining access through defects in the building fabric.

Find out more about our Nordisk and Ratwall Rat Blockers!


Metex Rat Blockers

Metex Rat Blockers are a non-toxic pest control solution that effectively stop rats & other vermin passing through drains towards a building whilst allowing them to pass freely downstream.

The Metex Nordisk & Metex Ratwall allow the drain to function as normal. By installing a Metex Rat Blocker into the drain outlet, all upstream branches are protected.

The Metex Nordisk TX11 range are the only Rat Blockers to achieve WRc Approval, the benchmark within the UK water industry. These high-quality industrial Rat Blockers have sharp serrated double flaps, and are made from marine-grade stainless steel.

The new Nordisk  LOCK Rat Blocker improves on the design further with a locking front flap for total customer peace of mind:

Left – unlocked, right – locked

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Pest FAQs

+ Help, I have rats in my house, where do I start?

Rats can enter house in a number of different ways, and the best way of permanently eliminating them is to employ a professional pest controller to survey the property and implement measures to eliminate the infestation and prevent it re-occuring. It is possible to take measures on a DIY basis, but there is danger that the time taken to elimination will be extended.

+ How do rats enter a building?

Rat enter building seeking warm, shelter and nesting sites. They can squeeze through narrow gaps and make use of building defects such as cracks in the brickwork or broken vents to enter buildings. Rat use drains as a network of tunnels through which they can travel and access building unseen.

+ Why are the drains so important when rat proofing?

Rats use drains as a hidden highway to access buildings. As they push upstream seeking warmth, food and nesting sites, they enter buildings. Rats can travel through pipes directly to the back of a toilet where they often chew the flexible toilet pan connector, causing upset and damage.

+ Can scratching in the loft really be linked to rats that have come through the drains?

Absolutely. If there is a defective drain, rats will often use this to gain access to a house. For example, when an extension is built onto a house, it is common that old drains are not effectively capped off, leaving rats free to use them as a point to gain access into the building. Scratching in the loft is the most common tell tale sign, this is most often caused by rats that have come through the drains, then the wall cavities and up into the loft.

+ Why install a Rat Blocker?

Quality Rat Blockers effectively block rats from travelling upstream through drains towards a building. The Rat Blocker blocks the approach of the rat with a chew proof stainless steel door, however the stainless door allows the waste to travel in the other direction without issue.

+ Will installing a Rat Blocker solve my rat problem?

Maybe. Rat Blockers are essential for proofing a building from rats, however they are not the whole story. The whole building must be considered with all possible entry points examined and addressed. If there are rats entering through the drains but also through a crack in the brickwork then the Rat Blocker itself will not completely solve the issue.

+ Rats are entering my building through the drains, will a Rat Blocker make them leave?

Fitting a Rat Blocker will prevent rats from entering a building via the drains, however if the resident rat population are comfortable with a food and water source then the Rat Blocker will not guarantee that they will leave. A Rat Blocker is one of many tools available to a pest controller.

+ Which Rat Blocker should I buy?

There are a growing number of Rat Blockers appearing on the market and it is essential that a quality, effective and proven unit is installed. Metex is the leading supplier of Rat Blockers in the UK and will never offer poor quality or unsafe products.

+ Which Rat Blocker do professional pest controllers use?

Both Ratwall and Nordisk Rat Blockers are widely used by pest professionals and are sold by the leading pest control product suppliers. Ratwall is the best selling Rat Blocker in UK, and Nordisk is the best selling Rat Blocker worldwide with more than 250,000 installed.

+ How do I know if a Rat Blocker is effective and reliable?

A reputable supplier will be able to stand behind the products they sell and provide testimonials from professional installers. The network of approved installers is testament to the quality of Rat Blockers from Metex.

+ I want to upgrade my Nordisk rat blocker to the new LOCK system, do I need to buy a new rat blocker?

No need - the Nordisk TX11 LOCK locking front flap system can be retrofitted onto older TX11 models and is available separately, so there's no need to buy an entire new rat blocker if you want to upgrade your Nordisk to increased security.

+ How does the Nordisk LOCK locking flap system work?

The system is very simple with no interlocking parts which could get stuck. The rear flap has a blue block which prevents the front flap from being lifted on its own. The twin flaps can only be lifted together, meaning that waste can flow normally through the rat blocker, but the front flap can't be opened by a rat trying to get through in the opposite direction. The sharp serrated edges of the flaps further deter rats from trying to get past the rat blocker.

+ What is RatTape and how can it be used?

RatTape can be quickly and easily applied over building defects to prevent rodent access. RatTape has a tough stainless mesh at its core, making it chew proof.

+ Where should I use RatTape?

RatTape can be used to proof building defects in a wide range of materials including wood, PVC, brickwork and concrete. The area that it will be applied to should be dry and free of dust and other debris. RatTape can be overpainted, but is not a substitute for a permanent repair to the building materials in highly visible areas (such as the front of buildings.)