Choosing the right bracket system for your rainscreen cladding isn’t the most glamorous part of facade design, but it’s one of the most important decisions you’ll make. Get it wrong, and you’re looking at thermal bridging issues, structural failures, or a facade that doesn’t last. Get it right, and you’ll have a system that performs brilliantly for decades with minimal hassle.
Having worked with Plastestrip FastFrame helping hand bracket systems across Kent and London since 2019, we’ve learned what actually matters when choosing a bracket system. This isn’t about overwhelming you with jargon – it’s about helping you make the right choice for your specific project.
Let’s walk through exactly what you need to consider.
What Does a Bracket System Actually Do?
Before we get into the selection criteria, it’s worth understanding what helping hand brackets are actually for. They’re the structural support that holds your rainscreen cladding panels away from the building substrate, creating the ventilated cavity that makes a rainscreen system work.
The brackets attach to your building’s substrate (blockwork, masonry, steel frame, timber, or concrete), then T-rails and L-rails fix to the brackets, and finally your cladding panels attach to these rails. Simple in principle, but the performance depends entirely on choosing the right bracket specification for your project.
Key Factors in Choosing Your Bracket System
1. Cavity Depth
This is usually your starting point. How much space do you have (or need) between your substrate and the outer face of your cladding?
The Plastestrip FastFrame system covers cavity depths from 50mm right up to 420mm using standard brackets, with bespoke options available on short lead times if you need something outside this range.
Why cavity depth matters:
- Insulation thickness – you need enough cavity to accommodate your insulation plus a ventilated air gap
- Substrate irregularities – older buildings with wonky walls need deeper standoffs for adjustment
- Services – if you’re running services in the cavity, you’ll need more depth
Single brackets achieve 80-280mm standoff as standard. Stand-offs greater than 300mm require additional cross bracing, and anything over 400mm in a facade (or 1000mm in a soffit) really isn’t advisable.
Pro tip: Measure your actual wall, not just what’s on the drawings. Walls are rarely perfectly plumb, and you’ll want adjustment room.
2. Cladding Material and Weight
Different cladding materials have different weights, and this directly affects your bracket spacing and sizing.
The FastFrame system is compatible with most major cladding brands and materials, including:
- Rockwool Rockpanel
- HPL (High Pressure Laminate)
- Fibre cement boards
- ACM (Aluminium Composite Material)
- Enamelled steel
- Timber cladding
- Render systems
Heavier materials like fibre cement need closer bracket spacing than lighter HPL panels. This is where proper calculations become essential – and we’ll get to that in a moment.
3. Wind Loading
Your building’s location, height, and exposure to wind all affect the forces your bracket system needs to withstand. A three-storey building in a sheltered London suburb has very different wind loading requirements to a coastal development in Kent or a tall building in an exposed location.
The FastFrame system uses both fixed point brackets (which take dead loads and wind loads) and sliding point brackets (which allow for thermal expansion and contraction while still resisting wind forces). Getting the right mix of fixed and sliding brackets is crucial for performance.
4. Substrate Type
What are you fixing into? This determines your fixing type and bracket specification.
Blockwork, masonry, and concrete: Use frame anchors (13mm hex head A4 stainless steel) in the larger elongated holes of the bracket. Always perform a pull-out test to verify the substrate strength – this isn’t optional.
Steel or timber substrates: Use 2 anchors per single bracket or 4 per double bracket, placed in the smaller 6.5mm holes (A2 stainless steel with 8mm hex head).
If your facade layout doesn’t align with the underlying framework, FastFrame offers steel top hat or C-channel profiles to bridge between the frame. This means your facade support can be installed independently rather than being dictated by structural framework positions.
5. Thermal Performance
Thermal bridging through brackets is a real issue that affects your building’s overall U-value. The FastFrame system includes integral heat-stabilised PVC isolation clips as standard – these create a thermal break between the aluminium bracket and the building substrate.
This isn’t just about energy efficiency. Without proper isolation, you’ll get corrosion where the aluminium meets dissimilar materials, weakening the framing and shortening the facade’s lifespan. The FastFrame’s integral PVC clip can’t be accidentally omitted during installation, which is a genuine advantage over systems where thermal pads are separate components.
If you’re aiming for Passivhaus standards or very low U-values, FastFrame brackets can achieve this – we provide technical calculations that show the effect of brackets on your overall thermal performance.
6. Fire Safety and Building Regulations
Post-Grenfell, fire safety is non-negotiable. The FastFrame system is BBA-certified and A1 fire rated (non-combustible), which means it meets current UK building regulations for rainscreen cladding support systems.
This matters more than you might think. Using non-certified or incorrectly specified bracket systems can void your building warranty and create serious compliance issues.
The FastFrame Advantage: Why We Specify It
We supply and install various bracket systems, but FastFrame is our go-to for most projects. Here’s why:
Unique three-part design: The folded aluminium bracket features a base leg much thicker than the stalk leg. Since bracket performance relates directly to base leg thickness, FastFrame brackets easily withstand the combined stresses of dead loads, wind forces, and facade weight. This design allows for wider bracket spacing, making it more cost-effective per square metre than weaker brackets.
Integral thermal isolation: The PVC clip that secures the L-piece and base plate together provides essential thermal and corrosion protection while also speeding up installation.
Material quality: Brackets are 5251 H22 grade aluminium, T & L rails are high-specification 6063 T6 grade aluminium, and all fixings are stainless steel to DIN 1.4301 standards.
Low component count: Only T and L section rails are necessary, supplied in 3m and 6m lengths. This simplicity means quick delivery and straightforward installation.
In-house technical calculations: This is huge. We handle all the technical calculations for your specific application – bracket spacing, sizing, fixing specification, the lot. Typically a 2-3 day turnaround.
How to Actually Specify Your Bracket System
Right, theory is fine, but how do you actually work out what you need? Here’s the practical process:
Step 1: Get in touch with us
We’ll need details about:
- Building dimensions
- Cladding material type and weight
- Cavity depth required
- Substrate type
- Local wind exposure
- Panel size and fixing method
Contact us and we’ll walk you through what information we need.
Step 2: We handle the calculations
Once we have your project details, we sort out all the technical calculations. You’ll get back a specification that includes:
- Maximum bracket centres
- Layout of single and/or double brackets
- Fixed and sliding bracket positions
- Required fixing types and sizes
- Span and cantilever limits
Step 3: Don’t deviate from the calculations
This is critical. The calculations give you maximum bracket centres based on your specific project. If values are marked in red on the specification, they’ve been assumed and must be verified before installation. Spans, vertical centres, and cantilevers must never exceed what’s specified.
Cantilevers must not be more than 50% of the length of the adjacent span, and there must always be a 10mm gap between rails going up the facade.
Common Mistakes to Avoid
Guessing bracket spacing: Don’t assume what worked on your last project will work on this one. Every building is different, and proper calculations are essential.
Skipping the pull-out test: If you’re fixing into masonry or concrete, always do pull-out tests. Substrate strength varies massively, and assuming it’s adequate is how facades fail.
Mixing incompatible systems: Stick with one manufacturer’s system. Mixing brackets, rails, and fixings from different suppliers often causes compatibility issues and voids warranties.
Ignoring thermal bridging: Brackets without proper thermal breaks can add significant heat loss to your building. Factor this into your U-value calculations from the start.
Installing brackets before checking alignment: Walls are rarely perfectly plumb. Use the bracket’s adjustment range to create a level, plumb fixing plane before securing everything permanently.
What About Other Bracket Systems?
Look, FastFrame isn’t the only bracket system out there. Systems from SFS NVELOPE, Downer, Fastec, and others all have their place. But for most UK projects – residential extensions, commercial buildings, retrofit work – FastFrame offers the best balance of performance, cost, and ease of installation.
If you’re working on a project with unusual requirements (extreme exposure, heritage constraints, specific architectural demands), talk to us. We can advise on whether FastFrame is right or whether a different system makes more sense.
Installation Considerations
Even the best bracket system can underperform if it’s badly installed. Key points:
- Rails must be installed vertically with 10mm gaps between sections
- Panels must never span over rail joints
- Support rails should never span over building movement joints unless specifically engineered
- One rail typically has only one fixed point bracket, with the rest as floating points for expansion
- Always use the specified stainless steel fixings – substituting cheaper alternatives is false economy
Cost vs Performance
Here’s the uncomfortable truth: cheap bracket systems cost you more in the long run. Weaker brackets require closer spacing, which means more brackets, more fixings, more labour, and more thermal bridging.
FastFrame’s stronger design means wider spacing, which often makes it more economical despite potentially higher unit costs. Add in the reduced installation time and improved thermal performance, and the total cost of ownership is lower.
Get Expert Help
Choosing and specifying bracket systems isn’t something to wing. We provide full technical support including:
- Site surveys to assess substrate conditions
- Technical calculations for your specific project
- Supply of complete systems with next-day delivery to most UK postcodes
- Installation by experienced teams
- On-site pull-out testing
Whether you need supply-only or full supply and install, we can help you get the right bracket system for your project.
Ready to Spec Your Bracket System?
If you’re planning a rainscreen cladding project and want to talk through your bracket requirements, get in touch. We’ll help you work out what you need, get the calculations done, and make sure your facade performs exactly as it should.
As one of the main suppliers of Plastestrip FastFrame helping hand brackets in the South East, we know these systems inside out. Let us save you the trial and error.
