How to prepare this house wall?

[WabbitPoo]

One wall of a house is quite damaged by weathering. It LOOKS like its been painted over dirty surfaces in the past. WHat's the best way to proceed before painting it again? Do I have to scrape all that white off, seal the underneath and paint over, or is there an easier way (not another bodge!)? I can scratch a lot of it off with my nails, so its badly adhered to what's underneath.

 

[KenGMac]

WabbitPoo, good evening.

Suggest you have a look @ "Soda Blasting" it is in effect a little like Sand Blasting but no where near as abrasive or using the same high pressures used in Sand blasting systems.

You can use a water pressure washer but, and there is a big but? you can / will introduce a load of water into the render, not what you want especially in the winter and when there is a possibility of frost?

Soda blasting will remove the loose material fast, some areas of the paint will still adhere, a pole sander / scraper? but because of the blasting these stubborn areas will be [hopefully] small areas.

When using the blasting it does cause a load of dust / debris, not advised on a windy day outside?

Ken

 

[WabbitPoo]

Cheers. Never heard of it so I'll look it up.

Scraping, pressure-washing or blasting, there's gonna be a hell of a lot of small white flecks of paint everywhere!

 

[KenGMac]

If you do the work in a snowstorm it will all just simply fade away??