Expert: Tom Petrilli - 11/11/2009

Question
I have two estimates for two flat roofs.  one on extension to garage and one over car port.  one said installing a GAF Timerline 30 roof with felt tar paper.  the other says installing a GAF Liberty flat roof.  what is the difference or are they both the same?  Wood is rotten so both are putting 3/4" CDX exterior grade plywood. do not know which one to go with.  can you help me??

Answer
Joseph,
Each material is meant for different situations, so Im a little confused.

Liberty is designed to be used in low slope applications or roofs that appear almost flat.
http://www.gaf.com/Content/GAF/RES1/ROOF/liberty.asp?viewer=1140&module=


Timberline shingles are for steeper slopes.
http://www.gaf.com/General/GAFmain.asp?silo=RES1&ws=GAF&APP=ROOF&Force=shingle-l...

As far as choosing a material or contractor; I think you should get another in-person opinion. These materials are for completely different uses; it would be like comparing a cars tires to its radio; they each belong on a car but they have completely different jobs and really aren't comparable.


Learn about flat roofs here:  http://www.lyonscontracting.com/new-flat-roof.html

Learn about shingle roofs here: http://www.lyonscontracting.com/shingle-start-finish.html

Good luck,
Tom