Bumpmapping issues

[Zandman26]

My prodjekt has come so far that we now starting to look for a proffessional look on it.
And then you get to the point were you need to start bumpmapping things, at first I could not figure out why my house got ether totaly blue or had half of the RGB scale on it, but when I resized the texture I saw that it loaded it as it should look and I sized it to fit the building but then I noticed that the same texture that Ive used on the roof also got back to the floor, My texture is of the type UV and I think thats whats causing the problem, cause in the tutorial you use a function called "MakePlanarTextureMapping" and what I know a Planar texture cant use a UV to get right.
So my question is, is there anny function that can apply a UV as height map or do I need to split both the UV and Mesh and put part by part together?