How to Repair Outdoor Render

[NullSec87]

Looking for advice on how to repair chips and uneveness in our outdoor render.  Would render/mortar did the job? Keeping the repair substance and finish even would be my concern. Any tips would be appreciated. 

[Jewelleryrescue]

hi @NullSec87 

That  gap is sitting  over an expansion joint foam which means that area may move a little with hot and  cold weather and will destroy any render cracking it.  So Render is not recommended.

You would be better off applying a gap filler with some  joint flex in it.  IE No more  gaps external

Selleys 430g White No More Gaps Exterior Gap Filler I/N: 1230161  $13^.99

No more gaps external      It

UNi-PRO Professional No-Drip Heavy Duty Caulking Gun I/N: 1670252  $13^.90

Caulking gun 

First cut some of that foam at 45 degrees angling  down into the  gap with a sharp stanly like  knife.  You dont want all the foam out as it will help you  fill it next. 

Buy  No more  gags the external use version and a caulking  gun if you don't own  one ask the tool shop as to  its good operation would be easier than written advice.

Basically cut the free supplied applicator nozzle at 45 degrees and have a 10mm hole

So caulk along the gap filling it with no more gaps (external variety) smooth the  bead of no more gaps with you finger and clean up with water and a  rag.  No need to fill more than 20 mm into the hole

The following no more gaps is more expensive  buy it is Off white in colour if that suits you and is even more weatheer resistant. 

Selleys 440g Off White No More Gaps Bricks And Mortar Gap Filler  I/N: 0266923  $22^{.29  No more Gaps Bricks and mortar Offwhite}  

[JacobZ]

Hi @NullSec87,

A warm welcome to the Bunnings Workshop community and thank you for your question.

I agree with @Jewelleryrescue that these gaps are acting as an expansion joint. If you were to fill them with a rigid material such as mortar and then render over them, they would likely crack pretty quickly as the vertical and horizontal surfaces move independently of each other.

You are much better off using the method Jewelleryrescue has described, which is using some filler rod as a backing on the wider gap and then applying an outdoor filler like the Selleys 440g Off White No More Gaps Bricks And Mortar Gap Filler.

Let me know what you think and if you have any further questions, please don't hesitate to ask.

Jacob