Should I use treated timber?

Had a job last week to remove & rebuild a small deck.
Second photo shows how they first realised there was a problem. Second photo is what I found underneath.
http://s99.photobucket.com/albums/l284/davidlang_photos/Deck%20Boards /
Incredibly the deck was installed by the house builder from new about 9 years ago.
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Dave - The Medway Handyman
www.medwayhandyman.co.uk
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The Medway Handyman wrote:

Yes, but what does the second photo show? ;-)
David
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On Sat, 19 Jun 2010 11:59:03 +0100, "The Medway Handyman"

Looks like it was treated timber but they trimmed the ends to fit the joists and the boards then rotted from the untreated cut ends?
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Geo

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Geo wrote:

Some of the boards had rotted all along their length and some of the loists. Also laid with no appreciable gap between boards.
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Dave - The Medway Handyman
www.medwayhandyman.co.uk
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