Pitched roof extension, tiling issues

[CamBam]

My builder hasn't tiled the sections of our new pitched roof extension that sit beneath the windows of the existing house. He said the pitch of the roof would not allow for tiles and flashing so we're left with what I presume is the membrane exposed. Is this normal or will it result in leaks in years to come?

//media.diynot.com/221000_220151_79874_84611053_thumb.jpg

//media.diynot.com/221000_220151_79875_12264358_thumb.jpg

 

[freddiemercurystwin]

The images are too small really but when you do that it needs to be done in lead or similar, not just not bother adding the tiles. Re-post this thread in the Roofing section anyway.