My water heater is located in my attic. After Katrina, I had to repair my damaged roof and it seems that the attic fan went out. Since then my water heater pilot light has repeatedly gone out. I can re-light it usually, but the lack of air up in the attic causes the light to go out. Presently, the light has gone out and I cannot relight it. What can I do, other than call a plumber to check out the unit?

If there was not enough air in your attic to light a pilot then you also would not be breathing. The problem may be very simple but the possibility of other issues and the possibility of setting your house on fire I suggest you get it repaired by a licensed plumber.

My water heater is located in my attic. After Katrina, I had to repair my damaged roof and it seems that the attic fan went out. Since then my water heater pilot light has repeatedly gone out. I can re-light it usually, but the lack of air up in the attic causes the light to go out. Presently, the light has gone out and I cannot relight it. What can I do, other than call a plumber to check out the unit?
Replace the thermocouple that's all you have to do or clean it with sandpaper.