y do people paint their houses?

Answer 1

to stop them rotting.
the colour is only decoration
the paint itself is to seal the material and stop it rusting, rotting or crumbling

Answer 2

Paint is not just cosmetic. Every building material shrinks, cracks and spalls (falls away) over time. Stucco plaster is a good example but wood is the same thing.

Stucco is the same chemistry as concrete, starts shrinking day one and continues shrinking forever. The rate of shrinkage gets slower and slower but it IS shrinking. Every year, as the building goes thru the weather, heat expands things and cool shrinks them. It's like bending a small piece of metal back aqnd forth - sooner or later, it breaks. All the while there's a danger of a new crack allowing water to get in.

An annual, or every two year, paint job of at least two coats will fill the microcracks. Yes, someday, you'll have to do a major siding replacement but how you maintain it will be a key to when that has to happen.

Good and periodic maintenance practices can stretch out the big repair costs.
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Answer 3

People paint their houses for aesthetic reason. It's just like a human body wearing clothes of variegated color.

Answer 4

why not?keeps their homes looking good and if they want to sell its a great way to do it.if the house has wood siding it keeps the wood from decaying and insects from getting into the boards

Answer 5

to have a better look and also to protect it from weathering effects.

Answer 6

to help preserve the wood, beautify and waterproof.