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"external walls" is correct and usable in written English.
You can use it when referring to the walls of a building or structure that are visible to the outside. For example: "The new apartment complex had external walls made with brick and mortar."
Exact(60)
The external walls are still standing.
The external walls are more glass than solid, with pivoting wood-frame doors, top left.
It's built from recycled materials, there are no external walls and there are just three rooms.
You have three options for the external walls – brick, cedar or render.
Higher levels of insulation will mean thicker external walls and higher levels of air-tightness.
Elsewhere in our eco-renovation, solid internal and external walls continue to be attacked as new insulation is added.
To minimise carbon emissions, Adapt and its architecture and construction partners thatched straw along the building's external walls.
The General Market would be cleared back to its external walls and adapted to house office blocks.
Wall insulation Around 35 per cent of heat is lost through the external walls of your home.
Covering your office roof and external walls in foliage has a heat reducing effect in summer and a warming effect in winter.
Two years ago, their excavations revealed that haematite-based pigments had been used to paint external walls – another transformation in our thinking about the Stone Age.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com