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FAQs

Supporting Architects, Designers and Specifiers with Grad

Grad is an innovative Cladding and Decking solution

At Grad, we understand the importance of providing architects, specifiers, and designers with a reliable, versatile system for high-end cladding and decking projects. Our hidden fix system, designed for flawless finishes without visible screws, brings precision and elegance to any project. Here are some frequently asked questions from our CPD Sessions*. ​​​

Do you do Bullnosed edges?

Yes, but it involves some specific setup:

  • Replacing the end clip with a half clip allows for an overhang, and using a longer length on the rail with a wedge clip provides additional support if stepped on.

  • There are aesthetic considerations with visible grooves if you choose a bullnosed overhang. This method is best applied where the grooves will not be seen, such as along a wall or with heavy planting.

Do you require a concrete slab below for levelling?

A concrete slab is not strictly necessary, but it’s one of several options for a stable base:

  • Grad rails can be installed on stabilised surfaces such as Type 1, Type 3, Grano-dust, waterproof membranes, paving slabs, or a full concrete bed.

  • Alternative supports include groundscrews, steel or HDPE frameworks, or timber joists.

  • For cladding, the rails can be mounted on posts, brickwork, or brackets, allowing flexible installation without impacting external insulation.

Do you advise on pergolas or arches?

Grad focuses on decking and cladding applications. We don’t get involved in the design or specification of pergolas or arches themselves, unless it relates to cladding them. We’re always happy to advise on timber finishes and cladding applications where Grad is being considered.

Do you provide specifications for ground preparation?

Yes. The Grad system can be installed on a range of stabilised ground types, including compacted Type 1 / Type 3 sub-bases, concrete slabs, existing paving, or ground screws. It can also be installed onto timber, aluminium or steel subframes, as well as over waterproof membranes for flat roofs.
Requirements vary depending on height, load and site conditions, and guidance is provided on a project-by-project basis, supported by Grad 3D layouts.

Do you have examples of decked steps and raised platforms?

Yes — we have examples of decked steps and raised platforms, including coordinated risers and treads that tie in with the main deck. Detailing depends on height and structure, so this is reviewed project by project. Please see our 'Projects' or take a look through our Catalogue. We also have more on file, so please get in touch if you require further examples.

What is the expected lifespan of Thermo-Pine?

Thermo-Pine typically offers a 15+ year service life when correctly detailed, installed and maintained. Performance depends on exposure, ventilation and overall build-up.

Are slip ratings available?

Slip ratings relate to the board manufacturer and surface finish, rather than the Grad system itself. Where available, we can provide manufacturers’ slip test data and advise on detailing to help minimise slip risk. Boards with anti-slip inserts can also be specified for areas such as steps.

Can Grad accommodate curved designs?

Yes — curved cladding is possible using mini or flat rails, with boards pressed into the curve and fixed at intervals. What’s achievable depends on the radius and board choice, and is reviewed on a project-by-project basis.

Are all timbers FSC® certified?

FSC certification applies to specific timbers and suppliers, rather than the Grad system as a whole. Some timbers are FSC® certified, while others are sourced from responsibly managed forests using different certification routes. Certification and origin can be confirmed product by product.

What stops the boards from lifting in high winds?

Although the boards clip in, they are mechanically locked into the aluminium rails. The clips prevent vertical uplift, so boards can’t pop off in high winds. The system has been used successfully in very exposed locations, with correct rail spacing and fixing advised as part of the layout. Grad Keys allow boards to be removed when required.

What maintenance is recommended?

Maintenance requirements depend on the board type and finish. In general, good cleaning, drainage and ventilation are key to maintaining slip performance and longevity. Product-specific maintenance guidance can be provided after the session.

Do you offer a design service?

We don’t offer a standalone design service, but we do provide project-specific technical support for more complex situations. This includes reviewing layouts, levels and system build-ups using Grad 3D, while the overall design intent remains with the designer.

What is the provenance of your timber?

Timber provenance depends on the individual species and supplier. We work with a small number of established European and international timber partners, and origin and certification can be confirmed on a product-by-product basis.

How are the plastic components recycled?

The plastic components are durable, engineered parts designed to remain stable for the lifetime of the system. They are removable at end of life and recycled through appropriate plastic recycling streams, rather than being left in the ground. We don’t use degradable plastics intended to break down in the soil.

How high can the pedestals go?

Our adjustable pedestals can typically accommodate build-ups of around 400 mm+, depending on configuration. Final height depends on load, spacing and build-up, and is reviewed per project

Can you give an indication of price?

Pricing varies depending on board choice, project size and build-up, so there’s no single price per m². Grad typically sits in the mid–to–premium range, with project-specific guidance available.

What is the longest length of timber supplied?

Timber lengths vary by species and availability at the time of order. Common lengths for each species include:

  • Moso Bamboo X-Treme & N-Durance: 1.85m

  • Thermo-Pine Decking: 3m to 4.8m

  • Thermo-Ash Decking 1.5m to 3.6m

  • Kebony: 1m to 4.8m

  • Accoya: 2.1m to 4.8m

  • Thermo-Spruce and Thermo-Ash Cladding: Ranges from 1.5m to 4.8m depending on style.

  • Custom lengths may be arranged upon request, but availability can vary.

What is the maximum height achievable with Grad adjustable pedestals?

Grad’s pedestals offer a variety of height adjustments depending on your project needs. For detailed configurations, please refer to the Pedestal Heights attachment, which outlines possible combinations of boosters and stabilisers to reach the desired height:

  • Base Pedestal Height: Minimum deck height of 86mm to maximum height of 408mm. 

What fire safety solutions does Grad offer for cladding projects?

Grad offers innovative cladding solutions designed to address critical fire safety challenges, including compliance with international standards like EN 13501-1. Our systems, including the Pyroclip and fire-treated materials, provide enhanced protection while maintaining the aesthetic and functional benefits of Grad's hidden-fix system. For more detailed information, check out our Cladding Fire Solutions brochure here.

What are the corner options for Grad cladding and decking?

For corners, you have options:

  • Corner Profiles: These can be used to create a clean finish, especially for cladding.

  • Mitre Joints: For a more integrated appearance, boards can be joined at corners with a mitre joint finish.

Can you create curved edges with Grad decking?

Yes, although curved edges require a customised setup:

  • Rails should be positioned as close to the edge of the curve as possible, with additional support rails in between.

  • Options for concealing exposed edges include metal edging, planting, or a cladding frame using mini rails.

  • Note: Grad does not currently have a specific solution for creating curved fascias directly.

Is there a risk of timber decking needing upkeep over its lifespan?

Yes, as with any natural timber product, upkeep is recommended:

  • Regular maintenance such as cleaning and applying protective treatments will help preserve the timber’s appearance and durability.

  • The type and frequency of maintenance can vary based on environmental conditions and timber species.

How can I prevent decking from becoming slippery in wet conditions?

The domed profile of the boards improves water run-off, meaning the time that the boards take to dry is reduced which helps the boards get back to being less slippery. Because there is less standing water, algae growth is reduced. Maintenance is required on any materials used, including composite, in order to maintain a clean, slip free surface. Our board partners can recommend further how to keep their boards looking good and how often maintenance is required.

Can Grad’s system support chevron or diagonal laying patterns?

Yes, the Grad system can support chevron and other angled patterns, although it may require specific layout planning. Adjustable clips can assist with non-parallel board orientations to create intricate designs. Any angles can be adjusted to suit whatever design you choose, allowing you to be as creative as you like.

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