How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manfuactured and modular homes

Do stains on the ceiling mean the roof is leaking?

Sunday, October 21, 2018

Maybe...or maybe not. The first thing we try to determine with a ceiling stain is whether it was caused by a roof leak or some other problem, such as a leaking air conditioning condensate-water drain line in the attic. If we conclude that a roof leak is the culprit, then the next question is: active leak or previous leak?

   If the home has a newer roof, then we might be looking at the problem that caused the homeowner to recently replace the roof. Perhaps they just haven’t repaired the ceiling damage/staining yet. Further investigation in the attic and on the rooftop itself will give us a clearer picture of what’s happening.

    One of the first tools we pull out for this puzzle is our infrared camera. A visual tool that sees heat instead of light, the infrared easily recognizes wet areas because the evaporation of the moisture cools the surface in the area of the wetness. And a wet area at the staining is an indication of an active problem. If the infrared camera sees signs of moisture, then we use another tool called a moisture meter to verify and measure how much water is in the material.
   But a dry area is not necessarily an indication of an issue that has already been repaired: if the cause is a roof leak, and it has not rained recently, then it is possible to have an active roof leak but no moisture at the time of testing.

   Looking up at the area directly above the stain in the attic tells us more about what’s happening; then, checking the area of roofing above that for defects that would cause leaking is next. Because the water in a roof leak doesn’t always fall directly down from where it penetrates the roof covering, sometimes even more probing is necessary. A roof leak can migrate downward between the roof covering and roof sheathing before it enters the attic, then run down the surface of roof framing lumber before it finally falls onto the ceiling. 

   But eventually we track down the problem and recommend a solution for you.

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 

  To learn more about roofs and attics, see these other blog posts:

Why is my roof sheathing sagging between the trusses?

What causes a sagging roof ridge line?

What causes bubble-like blisters in a built-up and gravel roof?  

Why does it cost so much more to replace a steep roof than a low slope roof? 

What is "ponding" on a flat roof?

Is an attic required to have a light by the building code? 

How can I inspect my roof for hurricane damage?

What would cause a home inspector and roofing contractor to disagree on the remaining life left in a roof?

Why is premature curl of roof shingles a problem?

How can I tell if a roof has more than one layer of shingles? 

What are the common problems with attic insulation? 

What is the life expectancy of an asbestos cement shingle roof? 

What's the average lifespan of a roof?

Why is it a mistake to replace a roof and not replace its flashings? 

Why is there no attic access hatch in the house?

What is the building code requirement for an attic access hatch, scuttle, or door? 

Does a roof with multiple layers of shingles last longer?

What can I do to prevent roof leaks?

Are roof trusses better than roof rafters (stick framing)? 

Why is a popped nail in a shingle roof a problem? How do I fix it?

What are the most common problems with wood roof trusses?

What causes a lump or dip in the roof? 

If my roof is not leaking, why does it need to be replaced?

How can I be sure my roofing contractor got a permit?

How many layers of roofing are allowed on a home? 

What are the dark lines running parallel to shingles on my roof?

Can metal roofing be used on a low slope/pitch roof? 

How can I make my roof last longer?  

What are the warning signs of a dangerous attic pull-down ladder?

How can I find out the age of a roof? 

Should I buy a house that needs a new roof?

Should I buy a house with an old roof? 

What are those metal boxes on the roof?

• What does "lack of tab adhesion" in an asphalt shingle roof mean?

    Visit our ROOF AND ATTIC page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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