Alternative decking solution from Gripsure made with innovative Accoya wood

Posted on 17 September 2018 in Gripsure News

Accoya wood is made from sustainably grown pine that is modified by acetylation. This is a permanent modification from the surface of the timber board right through to the core. The modification improves the timber's durability stability and in-service life. Classified within BS EN 350-2 Class 1 as very durable.

Leading non-slip decking manufacturer, Gripsure – with over 30-years of experience in resin and aggregate coated surfaces – have expanded their product range to include decking made from Accoya^® modified timber.

Founded in 2005, Gripsure has invested in their manufacturing facilities, and developed their range of non-slip decking products, to offer a solution for any application. Having gained second tier distributor status, Gripsure now offers a contemporary decking board made from Accoya. Featuring two non-slip aggregate infills, Gripsure non-slip decking made with Accoya is suited for projects where longevity and safety are paramount.

Accoya wood is made from sustainably grown pine that is modified by acetylation. This is a permanent modification from the surface of the timber board right through to the core. The modification improves the timber’s durability stability and in-service life. Classified within BS EN 350-2 Class 1 as very durable.

With its 50-year above ground and 25-year in ground/freshwater guarantee, Accoya wood is a natural fit for the Gripsure brand committed to delivering quality products that stand the test of time. The Accoya process ensures consumers get the very best results from their decking.

Gripsure decking made with Accoya wood comes with a 15-year non-slip guarantee, so when it comes to eliminating the risk of accidents, you can rely on Gripsure to outperform other products – guaranteed.

Order a free sample

Nothing beats seeing and feeling Gripsure decking for real, and Gripsure Accoya is certainly no exception. Order a free sample today and get inspired for your next landscaping project.

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Do I need structurally graded timber for deck boards?

Posted on 18 June 2018 in Timber

From time to time, we get asked to provide our deck boards structurally graded to C16 or C24. This is something we can offer our clients on request, but is this really necessary for timber deck boards? In this blog piece, we explore how softwood boards are appearance graded at source and discuss how the structural grading rules cannot be applied to deck boards due to the application of the timber.

Appearance grading

The majority of softwood deck boards in the UK is manufactured from European Redwood trees grown in the forests of Scandinavia, Russia and the Baltic States. This is because the cold climate and short growing season in these countries is ideal for producing a high-quality, strong and close grain timber. With timber being a natural product there are variances between each board due to a number of different parameters which include live knots, dead knots, checks, wane, cross grain, compression, fungal attack, discolouration, and dimensional deviances. These different parameters will affect the quality and suitability of the timber.

Qualified and experienced graders working at the mills will grade the timber by checking and measuring the different parameters against the defined rules within the Swedish appearance grading standard for softwood – SS EN 1611-1. The timber is then sorted into groups (or grades) of broadly the same quality of timber which allows the end user and companies such as Gripsure to choose a grade suitable for the application in which the timber will be used. Grades I to IV (the higher grades) are sold together and tend to be used for internal joinery products where knot content and size of knots need to be minimised. The most common grade for deck boards is the Scandinavian V grade but the VI grade is sometimes offered as an economy option by some merchants and manufacturers.

Structural grading

The appearance grades which are commonplace within the decking industry are different to the structural strength grades and classes. Structurally graded timber is required for certain applications to ensure the timber is strong enough for the load being placed on it. Products which require structural grading include roofing rafters, floor joists, wall plates and stud work for partitions walls where it is crucial that the timber being used is suitable for its application.

The load bearing capabilities of a piece of timber is dependent on its dimensions, species and spans being used in the construction. Timber is graded against structural grading rules that limits strength reducing factors such as knot size, position of knots, rate of growth, sloping grain, fissures and fungal attack. The timber is passed through a machine or more commonly examined by trained graders who visually assess the timber against the structural grading rules which specify acceptable limits (EN 14081-1 which is supported by BS 4978 (softwoods) and BS 5756 (hardwoods)). This process produces two strength grades – GS (General Structural) or SS (Special Structural). These strength grades can then be used to sort timber into strength classes (most commonly C16 or C24) which contain timber from different species and strength grades as per BS EN 338.

Each piece of structurally graded timber is stamped which displays information about the method of grading, strength grade, strength class, the graders license number, certification body, company reference, species, standard reference and condition of timber (moisture content at time of grading). Structurally graded timber must be clearly marked to show that it complies with the correct standards and strength requirements as set out in the building codes and regulations.

Can structural grading rules be applied to timber used for deck boards?

The TDCA (Timber Decking & Cladding Association) who are an independent technical and advisory body state that there are no established structural grading rules for timber deck boards. Structurally graded timber against EN 14081-1 is designed for rectangular timbers used on edge. The structural grading rules cannot be applied to timbers which are used flatwise. Therefore, the strength classes of structurally graded timber (C16 and C24) are irrelevant when the timber is being used for timber decking as the rules cannot be applied to that application.

A simple analogy is that in the same way an internal floor joist is structurally graded (most commonly to C16) and the internal floor board used upon it is not structurally graded, an external decking joist is structurally graded (most commonly to C16) and the external deck board used upon it is not structurally graded. Both the internal floor joist and the external decking joist are used on their edge so the strength class can be applied to that application (as per EN 1408-1). The boards themselves are used flatwise so the structural grading rules cannot be applied.

It is understandable that we receive a handful of enquiries for structurally graded deck boards, as C16 and C24 graded timber is prevalent for many timber products. With the lack of easy to digest and clear information it is easy to believe that you need your deck boards structurally graded too.

What should I look out for?

If you are looking to use a treated softwood deck board, here at Gripsure we would recommend choosing a product which is:

1. Scandinavian V grade European Redwood which has been appearance graded against SS EN 1611-1
2. FSC or PEFC accredited timber to ensure that the timber is responsibly sourced and the forests are well managed and sustainable
3. DeckMark Plus accredited manufacturer – Manufacturers who are annually audited and approved by the TDCA (Timber Decking & Cladding Association)
4. Boards which are treated to the right treatment classification for the specific environment the boards will be used in to ensure longevity
5. Boards which contain non-slip inserts with an initial PTV rating of 65 or above (extremely low slip potential) to mitigate the risk of personal injury in wet and slippery conditions

In addition to the deck boards we would recommend that the timber used for the sub-structure is structurally graded as this will give the deck it’s strength. The TDCA have calculated recommended joist centres in two span tables based on a domestic and commercial application which takes into consideration the size, profile and species of timber as well as the point and live loads placed onto the deck structure (as per BS EN 1991-1-1). We recommend following their recommended joist centre spans to ensure the deck isn’t springy under foot which can be caused if the joist centres are too far apart.

It is also important that the correct fixings and an experienced and competent installer is used to ensure the deck will pass the test of time. If any cuts are made to treated softwood boards, ensele must be used to seal the treatment to avoid premature failure.

Get in touch

We hope this blog piece clears up some of the grey areas around why the structural grading rules cannot be applied to deck boards. It is more important to focus on other factors such as treatment classification, appearance grade and slip potential when choosing a softwood deck board. If you would like to discuss any aspect of the blog further, feel free to get in touch with our friendly team.

Which type of wood is best for timber decking?

Posted on 4 August 2017 in Decking Tips

The most common material used for decking is a pressure-treated softwood as it is readily available and cost-effective. Builders’ merchants will generally stock at least one softwood decking board with some now stocking an anti-slip version as well. While softwood is the most common option there are alternatives on the market, which may be better for your project.

Hardwood

The main advantage that hardwood holds over softwood is its longevity. While most softwood timber decking boards have up to a 15-year in service life expectancy, hardwoods such as Yellow Balau can be expected to last for up to 50 years, and in some cases longer. They are far more durable and hard-wearing than softwood products, so consequently come at a larger cost.

Hardwood timber is generally considered higher quality than softwood. It’s more colourful and natural timber appearance makes it very popular for decking. The cost of hardwood varies significantly depending on the species, profile size and timber certification you are looking for, but as a very rough rule of thumb, you will be looking at around three or four times the price of softwood.

Requiring minimal maintenance and well suited to a wide variety of projects, hardwood decking is an investment to seriously consider for your decking.

ThermoWood

ThermoWood is available in a variety of timbers, including ThermoPine (softwood), ThermoIroko and ThermoAsh (hardwoods). The process of creating ThermoWood involves heating the timber in a low oxygen environment to alter its chemical structure and increase its durability. This is particularly effective for softwoods and can be a more environmentally friendly way to increase the life expectancy than using a chemical treatment.

The thermal process also increases the stability of a decking board. Invisible fixing systems can be used on the ends and sides of the board as the board will expand and contract less than normal. The biggest downside of using a heat treatment is its effect on the strength of the board. Some estimates suggest thermal treating reduces the overall strength of the board by 30%. The price of ThermoWoods varies depending on the species and sizes, but the costs are often comparable or slightly higher than hardwoods.

Accoya^®

Accoya^® is produced from fast-growing and sustainably sourced timber which undergoes a chemical process to modify the timber completely. The resulting timber is incredibly stable and comes with a life expectancy of 50 years when installed above contact with the ground and an amazing 25 years when installed in freshwater or in direct contact with the ground. In addition, the timber is virtually rot proof so can be used in virtually any environment. Currently, Accoya is available in a limited selection of lengths and comes in at a high market price, however for the investment you get a phenomenally stable and long lasting timber.

Medite^® Tricoya^®

Medite Tricoya is produced using wood fibres that have undergone the same chemical treatment as Accoya. This creates a panel product which is extremely stable and durable with a 60-year expected life cycle. As with Accoya, Medite can be in water contact with very few negative effects. The biggest downside of using the wood fibre is that the panels are susceptible to abrasion when walked on. Anti-slip coatings are recommended to give you an incredibly safe and hard-wearing product fit for a wide range of environments. Panels can be machined to smaller lengths or supplied as full panels to suit the area you are working with. This makes Medite truly is a flexible option when considering decking. As with Accoya, the cost of Medite will be towards the top end of the spectrum.

As you can hopefully see there are plenty of options to consider when deciding which timber to choose for your decking. You will need to consider the budget, site considerations such as wet or shaded areas and the appearance of the timber you are looking for.

Get in touch

If you have any questions or would like more information, get in touch with one of our friendly team.

Should I use composite decking in my garden?

Posted on 15 July 2017 in Outdoor Living

You know you would like to invest in new decking for your garden but which should you go for: composite or timber decking? There are a number of differences between them, from the material used to how safe they are to walk on when wet.

Composite vs timber

So what is the difference? Composite decking is usually composed of wood from sawdust mixed with plastic and moulded to resemble a deck board. The Timber Decking and Cladding Association (TDCA) has received a number of reports of poor composite performance, though these appear to be limited to a particular type of ‘cheaper’ hollow form board. Concerns have also been raised about new decking boards being fitted over existing substructures which are often unsuitable for wood plastic composite. Manufacturing composite decking is complex, so results will vary. If you decide to go ahead and use composite decking, make sure you are going for the best product you can find.

Timber decking is made from a solid, natural, renewable product: wood. Gripsure non-slip decking is made using high-quality, commercial-grade Redwood timber. And this is just the first of many differences:

Safety

One of the most important differences is that composite becomes slippery when wet whereas Gripsure anti-slip timber does not. Our innovative decking includes a non-slip treatment. This means they stay safe even when the decking is covered with surface water, algae, fallen leaves or even ice. All our products are independently tested with Gripsure also offering a 15-year non-slip guarantee, giving you peace of mind that your family are safe from the risk of accidents in poor weather.

Value for money

Many people assume that composite decking will be cheaper than solid timber decking. In fact, to get a reasonable quality composite decking you would need to pay about the same as for a hardwood timber deck. Cheaper composite options are likely to be very poor quality and are unlikely to last, so would not be good value in the long run. If you are on a budget, a softwood timber decking would be a better choice than a cheaper composite. If you have a bigger budget, you could get hardwood timber decking for the same price as the most expensive composite.

Long-lasting look and structure

Many people go for composite decking as they believe it will be a low-maintenance addition to their outdoor space. You may be surprised to hear that this wood and plastic blend needs more regular pressure washing than timber. We recommend a pressure wash to our catalogue of Gripsure products every 12 months. With composite, moisture can seep through the outer plastic layer down to the wood fibre causing it to swell, which over time can lead to holes forming in the surface of the boards. In comparison timber swells much less, reducing any structural damage that might occur. If you are determined to go for composite, do your homework and make sure you are confident you are getting the best decking you can find. We would always recommend timber as the best option for any garden. If you want safety without compromise, value for money and stunning decking in your outdoor space, then anti-slip timber is the answer.

Get in touch

If you have any questions or would like more information, get in touch with on of our friendly team.

Gripsure performance warranty and strength graded decking

Posted on 16 February 2017 in Gripsure News

Gripsure introduces a revolutionary performance warranty for their non-slip decking range.

What is a performance warranty?

Gripsure have introduced a revolutionary performance warranty for their non-slip decking range. You can now be assured your decking will retain its non-slip performance for 15 years, guaranteeing you complete peace of mind. No other company offers this level of performance warranty.

Some decking products will give you an initial slip resistance i.e. what they achieve on day one, before they are even laid. But at Gripsure we think this is irrelevant. Having invested in our product, we think you should have peace of mind for the future. What you really need to know is “how long will my decking remain non slip and to what extent?”

The aim of this warranty is to ensure that our customers have a clear understanding of how well the decking will perform, and what that means in practice.

Find out more about our performance warranty

More information

How is anti-slip measured?

There is a British Standard (BS7976) that uses a pendulum test to measure the slip resistance of a pedestrian surface (pendulum test value – PTV).

The UK Slip Resistance Group have then taken these figures and issued a guideline as how these results are practically interpreted i.e. how safe is a decking board when it achieves a certain PTV rating. A value greater than 65 is defined as an “extremely low” potential for a slip.

PTV range	Potential for slip
0-24	High
25-34	Moderate
35-64	Low
65+	Extremely low

What is strength grading?

Timber is a natural product and as such is inherently variable, not only in terms of appearance but also strength. Grading is used to give a basic indication of the strength of individual pieces of timber and allows for the selection of the appropriate strength grade for expected loads.

How is timber graded?

Timber can be graded mechanically or visually depending on what the material is used for, in the case of decking it is done visually. Graders look for structural issues within the timber, for example size and location of knots, twists, splits, twists and shakes. From this the decking boards will be labelled as Ungraded, C16 or C24, depending on the quality of the board.

Why should I choose graded decking?

Graded deck boards have several advantages when planning a project. Firstly higher grades are capable of handling higher uniformly distributed and point loads with minimum deflection or movement of the boards. Secondly, wider joist centres can be used for graded timbers which can aid in the design of the deck and also reduce the cost of the subframe. Alternatively, a thinner board could be used on the original centres, again reducing the cost of the project.

Some good examples of projects benefitting from graded boards:

Raised Walkways and Bridges: Graded boards allow for wider joist centres to be used which reduces installation time and subframe costs.
Balconies: Thinner boards and wider joists reduce the weight of the decking when securing the balcony to the building, as well as giving you flexibility in matching up with threshold heights.
Commercial Spaces: Wider spans can be used without fear of the boards deflecting and causing trip hazards, keeping costs lower whilst ensuring health and safety requirements are met.

Timber treatments

Posted on 23 September 2016 in Timber

Most softwood timber products should be supplied pressure-treated to give the product the longest possible ‘in service’ life, but what does this mean?

What is pressure treatment?

Pressure treatment is essentially the process of impregnating timber with a chemical preservative designed to protect the timber against fungal attack, rot and decay. These preservatives can be categorised into three broad groups: water-borne, oil borne and light organic solvent, however the application process is generally the same for each as outlined in the diagram below:

Use classes

Pressure treated timbers are split into several different ‘classes’ which are created by using a different solution strength during the treatment cycle. It is important to make sure you pick the correct class for your specific requirements to ensure long lasting performance. As a very brief overview the main classes are:

Class type	Class description
Use Class 1	Internal timbers that will permanently be dry
Use Class 2	Class description
Use Class 3	External timbers used above ground and exposed to the weather
Use Class 4	External timbers in direct contact with the ground and/or fresh water

Depending on the class you select you will have a different projected ‘in service life’, this basically means the expected life-span of the timber if it is installed correctly. For example, most decking will be treated to Use Class 3 and come with a 15-year in-service-life.

Colour

Pressure treatment will generally leave the timber with a green or brown colouring depending on the specific chemical being applied, however over time the timber with weather to a silver/grey appearance regardless of its original colouring or treatment. This means that any timber used, regardless of whether you use multiple treatment systems will eventually be indistinguishable.

End grain preservative

The chemical preservative will only penetrate the top layers of the timber, meaning there is a section in the centre of any board that won’t be impregnated. This is absolutely fine if you are installing the timber without any cutting or drilling, however if you do intend to break the treated timber it is essential to apply an end grain preservative to keep the treatment ‘sealed’.

Environmental impact

The chemical compounds used in pressure treated timber are constantly being developed to ensure they are safe for both the users and the environment around them.

References:
https://www.selwood.com/climbing-frames/why-not-pine.html
http://www.tanalisedtimber.co.uk/using-tanalised-timber/use-class-information
https://en.wikipedia.org/wiki/Wood_preservation

Get in touch

If you have any questions or would like more information, get in touch with one of our friendly team.

The Resurgence in Timber Decking

Posted on 12 April 2016 in Industry News

Over the last 30 years, timber decking has firmly established itself as a quick and aesthetic option for external landscaping. With a meteoric rise thanks to the TV makeover programmes in the 1980s and then the introduction of alternative materials in the last 10 years, the traditional timber deck has recently had to look at its shortcomings and adapt to market demands for safety, performance and quality.

As a material, timber with its sustainability, natural durability and timeless looks, remains a natural choice for architects today, and many are now coming back to specify timber for its simplicity, ease of installation and enhanced safety.

Safety

The biggest barrier that timber has had to overcome is its propensity to become very slippery, very quickly in the UK climate. And for commercial designers, the need for safety and peace of mind over the lifetime of the project is paramount. Timber is an attractive substrate for algae to quickly take hold – the timber surface retains moisture and therefore the can remain damp long after the rain has gone. Repeat this cycle many times over the season and you have perfect growth conditions for algae. Of course this algae growth can be physically removed, but particularly on commercial sites, this incurs additional time, costs and even logistical difficulties.

The solution lies in specifying a non-slip timber decking board. These boards use an unobtrusive aggregate treatment to give a long-lasting slip resistant finish. And they can be independently assessed to a slip resistance test BS7976, providing an objective measure to help rate the boards. This test is available as an initial measure of the new board, but also now as a measure after 10 years – an “extended performance guarantee” of how well the anti-slip properties of the board will last.

Timber Performance

Great developments have been made in the treatment of timber since those early days of arsenic-based chemicals. And by using the latest micronised copper technology softwood timbers can be treated for up to 30 years ‘in-service-life’. By using the Use Class Tables as defined in British Standard BS EN 335, there are 5 “use classes” to which timber can be treated. For timber decking it depends on the application i.e. where it is being used as to what will determine the level of performance expected from it. For example, if the timber is in direct contact with either the ground or freshwater it should be treated to Use Class 4, but where the timber is above the ground Use Class 3 applies.

Make sure the timber for your deck is treated to the appropriate Use Class, not just for the deck boards but for every element of the structure.

Quality of Timber

When looking to specify timber decking, the application should determine the most suitable species, grade and finish that is chosen.

Softwood timber is extremely popular, versatile, and readily available from many sources. Scandinavian timber is great value for money, and provides a good balance between quality of slow-grown timber stock versus cost. It comes in several grades, but the most frequently specified ones are Fifths and Unsorted.

Hardwoods are another option to consider, particularly for marine/freshwater applications, and with many hardwoods having an expected in-service life of 40 years plus, the higher initial cost can be a good investment when taken across its whole lifetime. And many hardwoods will now come with a fully certified “chain of custody” to ensure they are a safe environmental choice.

Sustainability

Which brings us to the use of timber for decking compared to other materials. By specifying either FSC or PEFC certified timber, you can be sure the decking has come from a sustainable forest and will be environmentally sound. Being a natural grown material, the harvesting, production and treatment of timber also provides sustainable employment, so by choosing timber over other “plastic” based materials goes beyond just the product – you help sustain the whole supply chain.

In conclusion

Timber decking is a naturally grown material that is wholly sustainable, and given the current range of finishes, species available and its performance characteristics, it is a material that is more than fit for purpose for buildings of the future. Its versatile, safe and extremely durable. Throw away any prejudices about slippery timber decking and specify a product that is timelessly beautiful, renewable and measurably safe!