Yes, in most cases you can. Working over water often means no ground to stand a scaffold on, and a floating pontoon can provide a stable base for scaffold structures where traditional access isn’t possible. The key is making sure the pontoon is properly specified for the load, the water conditions and the way the scaffold is tied in.
Why Use a Pontoon as a Scaffold Base?
Scaffolding over water has traditionally meant a complex and costly scaffold built out from the bank or standing in the water itself, which is often impractical on soft beds, deep water or sites where the bed can’t be disturbed. A floating scaffold platform gives the scaffolders a level, stable working base that can be installed quickly and removed without leaving a lasting impact on the site.
Is a Pontoon Strong Enough to Carry Scaffolding?
This is the first question any contractor will ask, and it comes down to simple loading arithmetic. A modular pontoon has a recommended loading of 175kg per square metre in a single stack, rising to 350kg per square metre when double-stacked.
Scaffold loads are carried through the standards (the vertical legs), so the calculation starts with the scaffolder’s own loading information. As an illustration, a pontoon of around 112m² in a single stack has a working capacity of roughly 19.6 tonnes. A scaffold of just over two tonnes with 28 standards, each loaded to a maximum of 2.5kN, comes to around 7.1 tonnes even in the worst case where every leg is fully loaded at once, leaving a comfortable margin.
Where a project needs extra capacity or reassurance, the pontoon can be double-stacked, and the arrangement can also be independently checked by a marine architect.
How Is the Load Spread Across the Pontoon?
Rather than letting each scaffold leg bear directly on a single point, the legs are set on sole pads and landed onto scaffold boards. This spreads each leg load across a wider area of the pontoon deck, which reduces the pressure on individual modules and keeps the platform level.
What Happens When the Water Level Changes?
A pontoon rises and falls with the water, so the scaffold needs a way of moving with it without being pushed sideways. One approach is to tie the scaffold back to the structure using rings or guides, so it acts like a pile guide. This restrains the pontoon horizontally while allowing it to move freely up and down. The pontoon can also be secured with ground anchors and ratchet straps back to the bank, depending on the site and where suitable anchor points are available.
What Should You Tell Us When Enquiring?
To specify the right arrangement quickly, it helps to have the following ready:
- The scaffold design and loading information, including the number of standards and the leg loads
- The location, water type and expected variation in water level
- The access available for delivery and installation
- Your programme, including when the scaffold needs to be up and how long it will be in place
A Recent Example
We recently supplied a single-stack pontoon to carry a freestanding scaffold for building works at Stowe Pool, working through the loading figures with the scaffolders and agreeing the tie-in and anchoring approach before installation. Read the full case study.
FAQS
Can scaffolding be built on water?
Yes. Scaffolding can be built on a floating pontoon, provided the pontoon is specified for the scaffold’s loads and the structure is tied in and anchored to allow for changing water levels.
How much weight can a floating pontoon hold?
A single-stack modular pontoon has a recommended loading of 175kg per square metre. Double-stacking increases this to 350kg per square metre.
Do I need to double-stack the pontoon for scaffolding?
Not always. Many scaffold loads sit comfortably within a single stack once the leg loads are checked, but double-stacking is available where extra capacity is needed.
Can you arrange the scaffolders as well?
We can work alongside your own scaffolding contractor or help to arrange one, depending on the project. Get in touch to talk through your requirements.
Get a Quote
If your project needs scaffold access over water, get in touch with our team and we’ll talk through the loading, access and anchoring for your site. We cover the whole of the UK. Call today on 01590 607104 or email us at admin@floatingpontoonhire.co.uk
