Practical guide
Scaffold and access for rendering a tall façade
On a tall building, the render is only half the job. Scaffold has to reach every part of the façade, carry materials and people safely, protect the street below and stay up long enough for each coat to be applied and cured. Understanding how that works makes it easier to judge a proposal for a three-, four- or five-storey frontage.
On this page
Why a small repair can still need full access
A cracked patch under a top-floor sill may be a small area of render, but it still needs a safe platform beside it, room for materials and a way to get debris down. Ladders are not a sound working platform for hacking off and re-rendering at height. For anything above a low first floor, scaffold or another properly designed access system is normally needed, even for a short job.
High-level inspection and high-level repair are also different tasks. A survey from a cherry picker or roof access may show what is wrong, but the repair needs access that suits the work: space to cut out, mix, apply and protect the render. Scaffold that is already up for roof or window work can sometimes be shared, if its design allows for the extra loads and lifts.
Scaffold on the pavement
Many tall frontages stand at the back of the footway, so the scaffold has to go on the highway. In North Yorkshire the scaffolding company must register with the council before applying, give at least seven days' notice, and normally build on the footway rather than the carriageway or a back street. A licence covers up to four weeks; the extension form has to be in at least three working days before it runs out.
Those dates matter for render, because the job may take longer than four weeks once curing times and weather are included. A licence also covers only the occupation of the highway; the council's page is clear that the scaffold company remains responsible for the design, ties, lighting and netting.
Working a tall face in lifts
Render on a tall wall is applied from the top lift down, so that water and splashes fall onto unfinished work rather than new finish. The catch is that thin coats and scraped monocouche have to be finished across a face without stopping part-way. K Rend's silicone thin coat must be worked to a wet edge, and its K Mono must be scraped at the same stage of set over the whole area.
On a wide, tall façade that means planning joints in advance: at bead lines, string courses, window heads or corners, where a stop will not show. It also means enough people on the scaffold at once to keep a wet edge across each band, which is why a tall front cannot always be done by a small team in short sessions.
Sheeting, wind and the street
Scaffold sheeting protects fresh render from rain, wind and direct sun, all of which manufacturers' data sheets rule out during application. It also keeps dust and debris in during hacking-off. Sheeted scaffold catches more wind, so the scaffold design has to allow for it; that is a matter for the scaffold designer, not the renderer.
At street level, people need protecting from falling material and the footway needs to stay usable. Protection fans, boarded lifts and covered walkways over entrances are common answers. For a building in commercial use, those arrangements should be agreed with whoever runs the property before work starts, so entrances, deliveries and fire exits stay open.
A hypothetical five-storey frontage
For example, imagine a five-storey stone and render terrace house of the kind the council's design guide describes on South Cliff's main streets, with cracked render on the upper three floors and sound render below. A full-height scaffold would be needed even though the ground and first floors need little work, and it would sit on the footway under licence.
The upper floors might be stripped and re-rendered in bands between the string courses, each band finished in one session. The lower floors might be cleaned and coated from the same scaffold. If insulation were added, Approved Document B's rules for residential buildings with a storey 11m or more above ground would also apply to the choice of boards.
Scaffold ties and the finished render
Scaffold on a tall building is tied into the wall at intervals, and North Yorkshire Council's licence page lists ties among the things the scaffold company is responsible for. On a rendering job the ties pass through the area being rendered, so the render has to be worked around them and the tie holes filled and finished to match once the scaffold is struck.
Ask how that will be done. Tie positions can sometimes be planned at bead lines or in less visible places, and the final making-good is easiest while the last lift is still accessible. Left to the end, small tie patches across a new finish can be the most visible part of the job.
Inspecting before the scaffold comes down
Once the scaffold is gone, getting back to the top of the building means arranging access all over again, so the high-level details should be checked while it is still up. Look at copings, the junction under any cornice or parapet, the drips under upper-floor sills, sealant at frames and the refixed rainwater goods.
Ask for photographs of each, because you will not see them from the street. Keep them with the product names and colour references. If anything is left for another trade to finish, agree who does it before the scaffold is struck.
After the work
Tall buildings shed a lot of water down their faces, and blocked gutters at the top send it down the render in sheets. SPAB's advice is to clear gutters after the autumn leaf fall and check rainwater fittings for leaks in heavy rain. On a tall building that usually means planned access each year rather than a ladder.
The Scarborough rendering homepage brings together the services if the inspection points to repairs, recolouring or a full re-render.
Common questions
Who applies for the scaffold licence?
In North Yorkshire the scaffolding company registers with the council and applies for the licence. Check that the scaffold, licence and any protection for the public are included in the proposal you accept.
Can a tall façade be done in stages to save scaffold time?
Sometimes, by elevation or by section, but each stage needs its own finished edge and the scaffold may have to be moved or adapted. Ask how the stages and joints would be arranged.
See housing and planning information for Scarborough and nearby places, including the source and geography behind each figure.
