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Frequently Asked Questions

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Postsaver Rot Protection

How do I claim my introductory discount code?

You should have received an email immediately after registering asking you to confirm your subscription. After this confirmation email has been received, a second email, including the discount code is sent to the registered email address. Check your junk folder if either email has not arrived in your inbox. If, after 2 hours, you have not received a code, message support@postsaver.com with the registered email address and we will ensure the details are correct and issue you with a discount code.

Why do wooden posts rot?

Wooden posts decay in the ground primarily due to the presence of three factors, all of which are found within the top 6 inches or 15 cm of soil: oxygen, fungi, and moisture. When these elements coexist, it creates the perfect conditions for fungi to thrive and for the post to decompose.

How does Postsaver rot protection work?

Postsaver rot protectors create an air and watertight seal around the critical first 6 inches or 15 cm of the post below ground. This dual-layer seal system excludes all the factors required for decay, guaranteeing against ground rot.

Can I use Postsaver rot protectors with fence post concrete?

Yes. All posts that have our rot protectors applied to them can be installed in all the usual ways - including installation with fence post concrete.

Where are Postsaver rot protectors made?

We make all of our rot protectors at our manufacturing facility in Yorkshire, United Kingdom.

What are Postsaver rot protectors made of?

Postsaver rot protection consists of a dual-layer system, this system comprises a tough polythene outer layer lined with a meltable bituminous inner sealant. Upon heating, the inner sealant melts while the outer layer shrinks onto the surface of the post, creating an air and watertight seal; locking out all the factors required for decay.

How do you know Postsaver rot protection works?

Our confidence comes from our zero failure, 20-year independent field test data conducted by the BRE, Europe's largest and leading timber test organisation. With millions of rot protectors sold to over 30 countries worldwide over the last 30 years, our product is proven in volume use, and our test data confirms this.

Is Postsaver the same as bitumen paint?

No, Postsaver is a much better option. Its dual-layer construction ensures superior protection. The inner bituminous coating is sealed to the wood, while the outer layer shields this seal throughout all seasons, even when the wood expands and contracts. Wooden posts naturally expand and contract with changing weather conditions. This movement can cause the wood to crack, breaking the seal of the bitumen paint and allowing oxygen, fungi, and moisture - the key factors for decay - to penetrate the post.

Is Postsaver the same as Flashband?

No. Postsaver rot protector's inner meltable liner is specially formulated to physically penetrate the surface of the wood rather than stick to the surface as flashband does. This results in a much tougher, long-lasting seal when using Postsaver.

Why do rot protectors not cover the bottom of the post?

Beyond 15 cm or 6 inches below ground there is not enough oxygen to support the decaying organisms and fungi. Coupled with temperatures below 10°C means that these decaying organisms are unable to survive and rot cannot occur.

Can water travel up from the bottom of the post inside the rot protector?

No, due to Postsaver rot protectors creating an air and watertight seal to the post surface, it dramatically lowers the moisture entry point to the bottom of the protector meaning moisture can't track far enough to reach the critical first 6 inches or 15 cm below ground where there is enough oxygen for the decay-causing fungi to survive.

Can moisture enter at the top of the rot protector and travel downwards?

No, the wind and the sun will dry the post before the moisture enters the ground-line section of the post. This combined with Postsaver's air and watertight seal, excluding the other factors required for decay, means that rot cannot occur.

Watch our moisture test video to see how effective Postsaver is at protecting the post.

How does Postsaver’s post replacement guarantee work?

As long as the Postsaver rot protector is correctly applied to a use class four post (UC4), then we automatically guarantee the post for 20 or 40 years, depending on the product purchased. In the event of a failure, our guarantee covers the cost of a replacement post and rot protector.

We are a family-run business that believes in treating customers fairly and honouring our guarantee in all valid claims.

Can I use Postsaver with preservative-treated fence posts?

Yes, our guarantee is valid only when Postsaver is applied to UC4 (Use-Class 4) preservative-treated posts. Postsaver's dual-layer air and watertight seal not only locks moisture, fungi and oxygen out but also locks preservatives in.

How do I know I have applied the rot protector correctly?

It is clear when the rot protector has been applied correctly as the product will effectively shrink to the most and, on rolling, will create two black bands, one above and one below the rot protector.

Please see our application video for a perfect step-by-step application.

How long will the rot protector last?

The material used to create the outer film liner has been used as an in-ground barrier film in damp proofing and landfill liners for over 60 years without problems. The projected lifespan of the outer layer of the rot protector in the worst ground conditions is over 200 years, and bituminous sealants have been used to protect wood from decay for over 2000 years.

How long is the rot protector product?

A regular rot protector is 35 cm (350mm) in length.

A +PLUS rot protector is 70cm (700mm) in length.

Do Postsaver rot protectors prevent termite attack?

On an independent test in which wooden blocks were encapsulated with rot protector material, termite attack did not occur.

In some countries with certain termite species, we have been told it is sufficient to only apply a rot protector to the ground-line section of the post as the termites generally live in the upper part of the ground. If they cannot detect wood, they will not burrow down to attack the wood deeper in the ground. In other countries, the whole of the in-ground section of the post has to be encapsulated.

Can rot protected posts be power-driven into the ground

Yes, rot protected posts can be power-driven into the ground using a post basher or tractor operated fence post driver.

Can rot protectors be applied to wet posts?

No, but they can be applied to posts that are slightly damp to the touch. If in any doubt, flash dry posts with a blowtorch before application.

What size posts can be protected?

We supply rot protectors to fit all sizes of posts. If you would like some guidance on which size product to purchase, you may find our Quick Buy Calculator useful below

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Postsaver Rot Protection: Application & Installation

What do I need to apply Postsaver rot protection?

All you need is a gas blowtorch or 2 KW+ hot air gun and, if applying rot protectors to a square post, a foam roller.

How long does it take to apply a rot protector to a post?

It typically takes 40 seconds per post for a gas blowtorch and 2-3 minutes using a hot air gun depending on the size of the rot protector and post used.

If I need to apply more than one Postsaver product, what overlap do I need?

If applying more than one rot protector, we advise a generous overlap of at least 1 inch. It is worth noting however that we have developed a Postsaver +PLUS product which is a double-length, double-life option, which may meet your requirements

How much does in cost in gas to apply a rot protector?

Typically £0.03 per rot protector.

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Postsaver Rot Protection - Technical Questions

Does the species of wood a post is made from affect how long Postsaver will last when applied?

Postsaver is suitable for use on all timber. Postsaver however only offers a 20 or 40 year post replacement guarantee, depending on the product used, when applied to UC4 treated posts. Postsaver can be used on untreated wood but will only extend its service life by 10 years.

Learn more about Use Class 3 & 4 posts in this infographic from the AWPA

Over what temperature range can rot protectors be used?

The storage temperature range is 0°C to 40°C. Due to their meltable inner liner, rot protectors must not be stored in direct sunlight, and it is recommended to fit them in the shade, at least out of direct sunlight.

What quality control is used when making Postsaver rot protectors?

Postsaver is an ISO 9001 certified manufacturer. All rot protectors are rigorously checked against a set of tight quality standards including size, weight, film thickness, softening point, shrink ratios and print quality.

Does the product need a licence or biocidal approval to be used?

No. The rot protectors are environmentally friendly and non-toxic therefore do not require any approvals, certification or import licences for use.

Are Postsaver rot protector's patented?

Yes, Postsaver rot protection is patented.

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Postsaver Pro-Set

What is Pro-Set?

Pro-set is a lightweight yet very strong expanding resin foam that can be used to fix fence posts into the ground.

Can I use Pro-Set with Postsaver rot protection?

Yes. For a guaranteed fence post, we recommend using Pro-Set with Postsaver rot protectors.

What sort of fence posts can I use Pro-Set with?

You can use Pro-Set with wooden, PVC, steel and composites posts.

How much does Pro-Set weigh?

Pro-Set is just 1.35 kg per pack. One pack is capable of fixing two posts in the ground.

How does Pro-Set work?

Pro-Set is a high-density resin foam that expands in the hole around the post, forcing itself into all voids in the soil to create a robust post-fixing solution.

What if Pro-Set grows over the ground-level when it expands?

If Pro-Set grows over the ground level, let it cure and then cut off the excess resin with a knife or sharp tool. Pro-Set is sensitive to UV rays and will degrade if exposed to sunlight, therefore ensure that footings are well covered with soil to protect it.

You can also place earth or soil on top of the foam as it is expanding, just before it reaches ground level. The weight of the soil is usually enough to stop it expanding any further and prevents the need to cut the foam once it's cured.

How long does Pro-Set take to use?

Pro-Set is quick and easy to use and only takes 3-5 minutes to full expand. Once expanded, this is the ideal time to trim off any excess and cover with soil. The product reaches full strength in just 90 minutes.

Do you need water to use Pro-Set?

No. Pro-Set is a ready mixed solution and requires no water.

How many posts does one pack of Pro-Set install?

The product is more efficient when installed using a fencing spade or auger. In this case, one pack of Pro-Set will be enough to fix two posts into the ground with a two-foot burial depth.

If using a regular spade, one pack of Pro-Set will fit one post.

Can Pro-Set be used in holes with standing water?

No. Pro-Set can be used in wet soil, but not if there is standing water. Remove the water or cover with soil, sand or substrate prior to use.

Once Pro-Set has hardened it becomes waterproof and will not be affected by water.

How strong is Pro-Set?

Pro-Set is strong, strong enough for most fencing jobs; it's only limitation is that it can't be used with concrete posts.

What is Pro-Set’s environmental impact?

Producing one pack of Pro-Set produces approximately 3 KG of CO2.

In comparison, concrete post-mix produces approximately 8 KG per CO2 for two bags – the equivalent post-fixing capacity to Pro-Set.

When looking at the CO2 transport costs on the environment, Pro-Set is far more environmentally friendly due to it weighing 97% less than concrete.

What temperature range can I use Pro-Set in?

Pro-Set is a chemical compound, and as with most chemical products, its efficiency depends on temperature. It affects the speed as well as the volume of the final footing:

  • In higher temperatures, Pro-Set will grow faster and can create more volume than specified in technical data sheets
  • In lower temperatures, Pro-Set will grow slower and can generate less volume than specified in technical data sheets

No matter the outside temperature, 2 hours before using Pro-Set, it should be stored at room temperature [between 20 and 25 °C] to achieve the best results.

Can Pro-Set be used in acidic soil?

Yes. Pro-Set is not sensitive to particularly acidic or alkaline soils.

Is Pro-set Safe after it has cured?

After Pro-Set has hardened it is nonreactive. No contamination takes place and it is neutral to the environment and safe to living organisms.

How long does Pro-Set last?

Pro-Set is designed to last at least 50 years in service.

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Postsaver manufactures and supplies guaranteed post rot protection that is proven to extend the life of wooden fence and gate posts. Our patented rot protection is independently tested and proven in volume use since 1994.
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*When applied to posts that meet the requirements of BS8417:2012 - UC4 (Use Class 4). See guarantee for details
**Based on not having to replace your fence in 10 years time due to post failure.


Postsaver uses long term independent test data on the effectiveness of barrier sleeves and wraps to reach all the conclusions given on this website (test data available on request). Based on this data, Postsaver believes longer life, maintenance of strength over time, improved safety and reliability, extended inspection periods and reduced maintenance requirements are reasonable claims. This is subject to Postsaver products being correctly applied as per our instructions and used on correctly preservative treated (for long term in-ground use - use class 4 or higher) wooden fence posts that are free of decay at the time of rot protection application. The claims made, real or implied are not warranties. It is the responsibility of the user to evaluate and satisfy themselves that the performance of the product meets their specific safety, reliability, extended inspection, repair and any other performance or cost-benefit criteria before using Postsaver rot protectors
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