abraham wrote:
:: Phil, are you saying to use a 13 foot high chain link fence...
::
:: Abraham

You can get chain link in 12 ft widths, you will need poles to attach it to
and then grow climbers up it, this would take no longer than a couple of
seasons.
Advantages:

it's cheap.
it's easy to erect, one person could put it up in less than a day.
It's safe in high winds as the wind passes through it.
It looks good when covered in flowers and foilage.
It wont destroy foundations or drains of adjacent properties.
It won't attract squirrels.
It's maintenance free.

Disadvantages:
It's ugly when first erected.

Your original suggestion of buying 13 ft trees is a tad ridiculous because
how long do you think they will stay at 13 ft?

Advantages:
It's instant cover, hiding an ugly building
Er that's it.

Disadvantages:
It never stops growing and you'll have to get up ladders every year to trim
it.
They will attract squirrels.
They are dangerous in high winds.
They will find any weakness in surrounding drains and could cause subsidence
in your neighbours property(s).
Have you ever tried to plant a 13 ft tree?, or carry one for that matter?

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http://www.blueyonder256k.myby.co.uk/