In this house, for example, we've used stone in the roofing and brick as roofing material.

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Asphalt shingles ( the most common roofing material in the U.S.) can become loose, cracked, be blown off by the wind or be damaged by hail.

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"Before you had to hunt for things through friends or contacts, " Hernan Mayor explains, as he loads roofing material onto the back of his bike at The Wonder builders yard.

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With these funds, which are managed through a private company, Mr Ortega has won support with giveaways of zinc roofing material, livestock and the like, as well as cheap bus fares.

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He lived and worked in a poor community and he noticed many residents used material from old billboards for roofing, because it was waterproof and mildew-proof.

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