Roof Dryer Vent Clogged

     Designs for homes have changed when it comes to the dryer vent piping.  Traditional homes thru the 80's saw the vent run out the side of the house.  Laundry rooms were designed near the garage, or near an outside wall.  Now, architects choose the roof to vent the hot air.  It becomes a problem when you have laundry rooms in the middle of a home, or as I see in some homes, more than one laundry.  Unless there was a plan to vent thru the slab, you have to send it up.  
     Dryer vents have very fine threads of your clothing that is lost in every wash.  Next time you clean your dryer vent, put one drop of water on the lint.  This causes the lint to become solid.  That's what happens on the roof vent.  The moisture that is present outside, eventually causes the lint to solidify.  Rain makes it even worse. When the vent begins to clog, you dryer no longer is efficient.  It will either blow the line loose, this is what you hope happens, or the dryer will burn itself up.  If you notice your dryer taking longer to do the job, or it smells like its burning.  Make sure to check the vent.  Sometimes they will blow off in the attic and spread lint all over.  Code requires that dryers vent to the outside.  Venting in the attic is a no no.  
     When I replace roofs, I always check the vent to make sure it's clean.  I've tried all the roof vents to see if any perform any better.  Not really.  The ones with a flapper door end up getting lint stuck, not allowing the door to close off.  Eventually they clog.  It's just one of those things your going to have to deal with.  Call your roofer or handyman to check your vent for you.  Very rare do I find the whole pipe is a problem.  Normally it's just the vent.  Take it apart and clean it.  Put it back on.  

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