My vaulted ceiling has sticky yellowish streaks running from the highest part of the ceiling down about 10 feet and ending in what looks like a drop. This all started after putting on a new roof about 5 years ago. What can I do?
You don't say where you are located and it might have a bearing on it..
In northern / colder areas when roofing is applied you should use nails that barely protrude thru the roof sheathing.
The reason being.. They will conduct cold faster than the roof itself. Now IF they protrude, say a half inch or so, and there is any moisture in the rafter bays then they will cause condensation. Usually this will evaporate before doing any damage. However... If it's real cold for a prolonged period they will form "ice balls". I have seen them bigger than a golf ball. Now when these puppies melt they're going to bleed thru about anything.
Wait for a cold spell & see if you have nails making ice up there.
Good Luck & hope this helps.
Vaulted ceilings are tricky. Not much space for venting to allow moisture to escape. Do you know if there was any sort of venting in the old roof? If the new roof was installed without venting, you could end up with condensation that would drip onto the ceiling material.
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