Why Choose Adjustable Decking Pedestals
& Subframe Cradles?
Adjustable Pedestals & Cradles: Built for Speed, Engineered for Precision
Whether you’re transforming a backyard patio, building an elevated commercial roof terrace, or installing a low-profile balcony subframe, F.H.Brundle’s adjustable decking pedestals provide the ultimate foundation.
Covering heights from 10mm to 975mm, our pedestal systems—often referred to as decking risers or support feet—dramatically reduce installation time, eliminate uneven slopes, and extend the life of your decking subframe.
Equally at home in industrial and commercial settings as they are in residential – this range of deck supports feature tremendous load-bearing properties.
Advantages to using adjustable pedestals / risers
• No Messy Excavation: Avoid digging up existing concrete or old patios—install directly over existing hard surfaces.
• Protects Your Investment: Elevating your joists off the damp ground allows air circulation and water runoff, preventing timber rot and membrane damage.
• Flawless Finish: Achieve a flat, seamless step-out transition from your back door to your garden or balcony deck.
What are Adjustable Pedestals (Risers)
Adjustable pedestals (or risers) are heavy-duty, height-adjustable support feet engineered to raise, level, and support decking subframes, paving slabs, flooring, or porcelain tiles over solid bases.
Instead of embedding timber posts in concrete or laying joists directly on damp ground, these units sit on top of the substrate (such as concrete pads, balconies, or roof membranes) and use a screw-jack thread system to allow precise height adjustments.
Which Pedestals are the best choice
Brundle Pedestals vs. RynoDeck Pedestals
| Feature / Property | Brundle Pedestals | RynoDeck Pedestals |
|---|---|---|
| Material Construction | UV-stabilized, 100% recyclable high-density polypropylene (PP) | High-density polypropylene (PP) / Heavy-duty polymer |
| Height Range | 10mm to 975mm (10–40mm cradles, 23–405mm standard risers, up to 975mm with 220mm extenders) | 10mm to 1000mm+ (10–40mm cradles, 22–960mm+ adjustable risers & extenders) |
| Slope Correction | Integrated self-levelling head for slopes ±5° (with optional lock for fixed angle) | Self-levelling heads available for slopes up to 5% (1:20 gradient) or fixed-head with slope adjusters |
| Fire Class Rating | Standard polymer rating; suitable for balconies/terraces under 11m | Standard PP range (Class E/F); Euroclass A1 non-combustible steel ranges available |
| Noise & Cushioning | 2mm anti-noise / anti-slip rubber head & optional acoustic base pad | Anti-vibration rubber shims & acoustic isolation pads |
| Surface Compatibility | Timber joists, Aluminium subframes, Composite joists, Porcelain tiles | Timber joists, Composite joists, Aluminium frames, Paving slabs |
| Key Features | Top-adjustment key tool (fine-tune without lifting tiles), anti-unscrewing safety blocks, cut-to-edge base guides | High compression resistance, wide footplate load distribution, wrap-around joist cradles |
| Ideal Application | General residential & commercial decking, patio overlays, low-to-mid rise balconies | Heavy-duty landscape projects, commercial paving, raised roof deck subframes |
The Benefits of Adjustable Pedestals
• Rapid Levelling: Screw-jack thread mechanisms allow millimetre-exact height adjustments, drastically speeding up subframe installation compared to manual shimming or packing.
• Automatic Slope Correction: Self-levelling heads automatically compensate for ground falls and uneven gradients up to ±5°, keeping the finished surface flat without extra labour.
• Rot & Moisture Prevention: Elevating timber and composite joists above the ground allows continuous airflow and rapid drainage, stopping joists from sitting in standing water and decaying.
• Protects Substrates & Membranes: Wide, smooth base plates distribute weight evenly across ground surfaces, avoiding punctures to roof felt, EPDM, fiberglass, or asphalt membranes on balconies and roof terraces.
• No Excavation Required: Units sit directly on top of existing concrete, paved patios, or solid bases, eliminating the need for digging holes, mixing concrete, or hauling away soil.
• Integrated Drainage & Utility Access: Keeps pipework, cables, and drainage channels hidden beneath the deck while leaving them accessible for future maintenance.
• High Load Capacity: Made from durable, UV-stabilized polypropylene capable of supporting heavy weight loads (up to 1,500kg per unit) in temperature extremes.
• Acoustic Insulation: Integrated rubber head pads dampen impact sound and footstep vibration across subframes and living spaces below.
BRUNDLE RISERS
RYNODECK PEDESTALS
Self-Levelling Head Options
FOR ALUMINIUM JOIST
FOR WOODEN JOISTS
FOR PORCELAIN TILES
Technical Specifications & Compliance
Technical Specifications:
• Height Range: 10mm to 975mm (using low-profile cradles, standard adjustable risers, and stackable extension pads/rods).
• Load-Bearing Capacity: Up to 1,500 kg per pedestal (varies by specific model and elevated height).
• Slope Correction Capability: Self-levelling heads automatically correct gradients and drainage falls from 0% to 5% (±5°).
• Material Composition: UV-stabilized, 100% recyclable High-Density Polypropylene (HDPE).
• Temperature Resistance: Formulated to withstand extreme thermal conditions ranging from -30°C to +120°C.
• Base Footprint: 200mm to 210mm diameter circular base plate, designed to distribute surface load evenly across sensitive roofing membranes.
• Acoustic & Non-Slip Pad: Integrated 2mm thick anti-noise and anti-slip rubber head coating for sound dampening and frame stability.
• Locking & Safety Mechanism: Equipped with an anti-unscrewing stop-block system and reverse-thread winder to prevent unwind under dynamic load vibration.
• Chemical & Biological Resistance: Resistant to mold, algae, frost, road salts, bitumen, and standing water.
• Subframe Compatibility: Head profiles available for timber joists, composite subframes, aluminium framing channels, and porcelain paving spacers.
Testing & Compliance Status:
• Building Regulations Height Threshold: Suitable for domestic and commercial balconies, roof terraces, and raised decks on buildings below 11 metres in height (where fire-rated non-combustible systems are not mandated).
• High Structural Compression Load: Engineered for high compressive weight capacity (RynoDeck pedestals rated up to 1,500kg+), ensuring structural stability under heavy residential and commercial foot traffic.
• Integrated Safety & Anti-Displacement Controls: Features anti-unscrewing safety blocks and a reverse-thread dual-locking mechanism (clockwise base, anti-clockwise upper sections) to prevent thread backing-out and movement under dynamic loads.
• Substrate & Waterproofing Protection: Designed with a wide circular footprint (200mm base diameter) that spreads dead and live loads evenly across surfaces, protecting roof waterproofing membranes without piercing or puncturing.
• Environmental & Material Durability: Manufactured from 100% recyclable, UV-stabilized Polypropylene and recycled glass-filled nylon that operate in extreme temperatures (-30°C to +120°C) and are completely resistant to rot, algae, mold, bitumen, and standing water.
Adjustable Pedestals & Cradles Testing Report
| Test | Test method | Value |
|---|---|---|
| Slope Correction Range | Integrated Self-Levelling Ball-and-Socket Head | -5° to +5° (up to 6° / 10.5% for RynoDeck) |
| Height Adjustment Range (Cradles) | Manual Screw-Thread / Low-Profile Setup | 10 mm – 40 mm |
| Height Adjustment Range (Pedestals) | Modular Base + Winder + Extenders / Extension Pads | 23 mm – 975 mm (Custom configurations up to 1000 mm) |
| Pedestal Base Footprint & Load Spreading | Direct Surface Contact Footprint Analysis | Ø 200 mm – 210 mm |
| Compressive Load Capacity | Static Vertical Load Testing | 1,500 kg+ per unit |
| Temperature Resistance & Working Range | Thermal Exposure Testing | -30°C to +120°C |
| Acoustic Performance / Sound Isolation | Anti-Slip Rubber Head Coating & Base Pad Layer | 2 mm top head coating + 3 mm rubber base pad |
| High-Rise Lateral Stability (≥800 mm) | Mid-Point Collar & Cross-Bracing Rods |
Stabilised against lateral sway and wind loads |
| Building Height Suitability | UK Building Regulations Approved Document B | Certified for balconies/terraces under 11 metres |
FAQs
When your pedestal height reaches 800mm or more, fit a big fixing collar (84COLLAR, Ø 230mm) around the shaft, then attach connecting rods to brace it against adjacent pedestals. Two rod sizes are available: 84RODS (adjustable 340–500mm, suits tile sizes 480–610mm) and 84RODL (adjustable 500–750mm, suits tile sizes 640–910mm). This bracing prevents lateral movement under load and is especially important on elevated roof terraces exposed to wind.
Use the porcelain tile head (84HEADPAVE). It features removable spacer tabs to accommodate tiles of different sizes, and is designed for use with the adjustment key (84KEY) — allowing you to fine-tune the pedestal height without lifting heavy tiles. Simply insert the key from the side and rotate to raise or lower the head. For aluminium joist systems, choose 84HEADOUTDURE; for timber joists, choose 84HEADJOIST.
A cradle supports a joist across two contact points and is designed for very low-profile applications — starting at just 10mm. It is ideal for patio overlays and renovation projects where minimal build-up height is critical. A pedestal is a single-column support that carries the load on a central head, with height adjustment from 23mm up to 975mm (and beyond with extension pads). Both use self-levelling heads and are compatible with the same range of surface types.
Yes, asll long as the terrace or balcony is below 11m (where fire-rated systems come in to play) — the 200mm base diameter distributes weight effectively across roof membranes without piercing them, and the optional rubber base pad (84BASE, 3mm thick, 230mm diameter) provides additional protection against vibration and noise. The system is suitable for both domestic balconies and commercial roof terraces. For pedestals at heights of 800mm or above, use connecting rods (84RODS or 84RODL) with a big fixing collar (84COLLAR) for added stability.
Yes. All self-levelling heads offer ±5° slope correction as standard, allowing you to achieve a perfectly level deck or paved surface without shimming or packing. Simply set the pedestal to the correct height and the head automatically compensates for the incline. If you need to lock the head permanently at a fixed angle, press in the self-levelling lock (84LOCK) to convert it to a fixed-head pedestal.
The adjustable cradle (84ADC1040) supports decking from just 10mm — making it ideal for low-profile patio overlays, balcony renovations, and situations where clearance is limited. For standard adjustable pedestals, the minimum height starts at 23mm (25–33mm range, code 84PED33). Heights are always measured from the base of the pedestal to the flat surface of the adjustable head.
