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Old 01-27-2007, 01:26 PM   #1
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rust on nails in attic on one side of roof only


hello everyone , i have one problem , way would there be rust on the nail bottoms in attic of the roof on one side of the house. what could be cousing this. do i need more insulation up there or somthing. its only r19 at the moment. till i get more money. and there are no leaks.
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dan

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Old 01-27-2007, 09:39 PM   #2
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rust on nails in attic on one side of roof only


What climate do you live in. It sounds like there is a problem with warm air getting to the exposed , cold nail tips and causing condensation on them (assuming a cold climate) Is there any type of hot air ducts in the attic that could be leaking? What about water heater or furnace vent stacks? How close is the roof deck to the ceiling in the problem area. There could possibly be enough hot air escaping through wire and pipe penetrations in the upper wall plate to reach the nail tips if the roof pitch is very shallow. Is this problem on the "windward" side of the roof? Another remote possibility is that the shingles are nailed too low (below the seal strip) , thus wind driven rain may be seeping down the shanks.

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Old 01-27-2007, 09:42 PM   #3
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rust on nails in attic on one side of roof only


Initial concern: Lack of proper attic ventilation. Moist, damp air gets trapped =can cause rust on interior fastener surfaces...

Do you have any kind of proper ventilation? ... in your roof, Attic, or Soffit? Regardless of insulation: If your rafter cavities are insulated, do you have rafter venting installed as well?
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Old 01-27-2007, 09:56 PM   #4
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rust on nails in attic on one side of roof only


Another Thought: Only on one side?.... hmmmm....

Question: Is the side you are referring to - the side that the sun rises onto in the a.m. ? The side that receives the sun in the early part of the day???
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