Handrails and Fences on Retaining Walls in Christchurch
Top Retaining Walls Christchurch designs and installs the handrails and fences that go on top of retaining walls. Powder coated aluminium, galvanised steel, glass balustrade or timber, with the fixings designed into the wall from the start rather than drilled into a finished structure afterwards.
- Barriers required where there is a drop
- Posts built into the wall rather than retrofitted
- Aluminium, steel, glass or timber
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Two things drive this. Safety, because a drop above a certain height needs a barrier and that is a Building Code requirement rather than a preference. And structure, because a fence or balustrade fixed to the top of a wall applies load to it, and a wall that was not designed for that will show it.
When a retaining wall needs a handrail or barrier
Where there is a fall from one level to another beyond a certain height, a barrier is required and it has to meet requirements for height, loading and climbability. On a driveway wall or a terraced garden that is a common trigger.
Pool situations add another layer, because the wall and any barrier interact with pool fencing requirements. We deal with those together rather than separately.
Why the fixing into the retaining wall matters
Designed in, not drilled in
Core drilling into a finished block wall to fix a handrail post puts a point load into a structure that was designed for earth pressure. Cast in fixings or core filled cells set at post positions solve that at the design stage for almost nothing.
Water
Every penetration through a capping is a water path into the wall. Fixings get sealed and flashed, because water sitting inside a block wall's cores is exactly what you spent money avoiding.
Barrier loading
Barriers are designed for a horizontal load applied at the top rail. That load transfers into the wall, and on a tall or slender wall it is part of the design rather than an afterthought.
Handrail and fence options for retaining walls
Powder coated aluminium is the default on driveway and terrace walls: light, low maintenance and available in colours that disappear against a dark wall. Galvanised steel suits rural and commercial. Glass balustrade is the choice where a view is the whole point, which on a Port Hills terrace it often is. Timber suits character properties and garden settings.
Handrails and Fences at a glance
- Requirement
- A barrier is required where there is a fall beyond a set height
- Criteria
- Height, loading and climbability under the Building Code
- Fixings
- Cast in or core filled at post positions, designed at wall stage
- Water
- Penetrations sealed and flashed through the capping
- Loading
- Barrier load transfers into the wall and is part of the design
- Materials
- Powder coated aluminium, galvanised steel, glass, timber
Handrails and Fences in Christchurch: common questions
Do I need a handrail on my retaining wall?
Where there is a fall beyond a set height, yes, and it has to meet Building Code requirements for height, loading and climbability.
Can a handrail be added to an existing wall?
Often, but core drilling into a finished wall puts point loads into a structure not designed for them. Designing the fixings in from the start is far better.
Which material should I choose?
Powder coated aluminium for most residential walls, glass where the view matters, galvanised steel for rural and commercial.
Will the fixings leak into the wall?
Not if they are sealed and flashed. Every penetration through a capping is a water path if it is not detailed.
At what height does a retaining wall need a barrier?
Where there is a fall from one level to another beyond the height set in the Building Code, a barrier is required and it has to meet requirements for height, loading and climbability. On driveway walls and terraced gardens that threshold is crossed more often than people expect, and it is worth confirming at design stage rather than at inspection.
Can a handrail be retrofitted to an existing wall?
Often, but core drilling into a finished wall puts point loads into a structure designed for earth pressure, and every penetration through a capping is a water path into the wall unless it is sealed and flashed. Designing the fixings in at wall stage costs almost nothing by comparison.
What barrier material lasts best on a retaining wall?
Powder coated aluminium for most residential walls, because it is light, low maintenance and available in colours that disappear against a dark wall. Galvanised steel for rural and commercial. Glass balustrade where a view is the point, which on a Port Hills terrace it usually is. Timber suits character properties and garden settings.
Recent Christchurch jobs
Boundary wall between us and the neighbour on a new build. Sorted the levels, the consent question and the fence on top in one job. Turned up when they said and left the site clean every night.
Builder here. I use them on subdivision work because the paperwork comes back complete. PS1 up front, PS4 at the end, no chasing.
Wall failed after the big rain and took part of the bank with it. Made safe within two days and rebuilt a month later with real drainage behind it.
Terraced the back lawn into two levels. Fast, tidy, fair price, and the drainage was done properly.
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