I had my roof finished the other day and noticed around the sides of the dormer where it interfaces with the ridge these holes. I am concerned as i would have assumed this material looks stretched before it was bonded leaving these holes, before i pay can i confirm this is normal or should be corrected it looks like a rubbery material not sure what it is. Thanks. Also the leadwork down the sides what's stopping water blowing in the sides? I guess membrane underneath is then only protection?