More pages is better as long as you are not repeating yourself. This way you can make very targeted content for very targeted keywords. It would be hard for a page about wooden lintels, steel lintels, concrete lintels and cavity lintels to rank for for the term "steel lintels." However, if you have a page solely about steel lintels, its a lot easier to get rankings on that phrase.
The key is not to repeat yourself. You don't want duplicate content. Ehow got dinged on this in the Panda update and so did about.com because they would have two articles about essentially the same thing, like "how to use a screw with a flathead" and then "how to use a screw with a phillips head." techinically, they are slightly different, but they are essentially going to say the exact same thing except for the one detail about the shape.
So don't make a bunch of articles that are all nearly identical, but create as many pages as you can to get very targeted content.