Flaky paint/crumbly render

Question

Having to continually repaint the black plinth around the bottom of the exterior north facing wall on my 1930s house with the render being very crumbly, paint always lifting/flaking off - even if I apply stabilising solution before Sandtex masonry paint.  Above the plinth is fine.

Could this be a symptom of an underlying issue? DPC in place and no other issues....

Richard · Accepted Answer

It sounds as if the plinth has no waterproofer added when it was mixed and as it takes the brunt of the weather its done its time but a proper inspection would determine this

Duncan · Answer

Without actually inspecting the condition of the render, and the area around the property,  I could assume that in fact the plinth has breached and moisture is getting into the render. By continuing to apply sand tex or any other masonry paint your trapping the moisture hence the blistering/ peeling.

As long as there are no other issues, ie blocked drains, built up paths or land affecting water build up, I would remove the existing render, let it breath and dry out and then re apply a fresh render.

Jonathan · Answer

Sounds like not enough cement and Waterproofer in the sand and cement.

James · Answer

Probably old sandy render, sounds like needs replacing of the old plinth.

Darren · Answer

Yes this is a sign of rising damp and needs looking at straight away.

Thomas · Answer

If the render is crumbling that is the underlying problem you have,the paint needs a fresh solid flat render plinth after hacking off the existing. There are excellent tanking mortars on the market these days and use a sand with low levels of salt content. Before repainting rub the new render with a low abrasion block to increase the bond of your paint

Gino · Answer

With painted masonry and water ingress gets trapped so causes render to crumble, remove complete and redo then paint every 3/5 years

Gareth · Answer

definetly lack of waterproofer and cement in the mix

Flaky paint/crumbly render

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