A home inspection shows ice dam damage only in part. It’s a visual look at what’s there on the day. InterNACHI’s Standards of Practice have the inspector report observed indications of active roof leaks. They also have the inspector inspect the ventilation of unfinished spaces, including attics. And the Standards say an inspection will not identify concealed or latent defects. So the report can tell you what was visible on the roof and in the attic. It won’t tell you what’s inside a wall.

Per InterNACHI, ice dams force water to leak from the roof into the building envelope. That may lead to rotted roof decking. It may also rot walls and framing, and InterNACHI names mold growth among the results. The damage can show up long after the ice has melted. A buyer who never asks may find out after closing. If you own a house with an active ice dam, there are no removal steps here. This is general information, not safety, legal or insurance advice.

What Is Ice Dam Damage?

It’s the harm that follows when an ice dam forms on a roof. InterNACHI’s article on ice dam hazards says ice dams are formed by an interaction between snow cover, outside temperatures and heat lost through the roof. It also says gutters do not cause ice dams to form, contrary to popular belief.

The article says ice dams are problematic because they force water to leak from the roof into the building envelope. InterNACHI names rotted roof decking as one result. Rotted exterior and interior walls and framing are others. So is mold growth.

The article also says wet insulation doesn’t work well, and that chronically wet insulation will not decompress even when it dries. Water from the leak can infiltrate wall cavities and cause paint to peel and blister. InterNACHI says that may happen long after the ice dam has melted, so the damage may not appear directly related to the ice dam. Picture a bedroom ceiling with a pale stain near the outside wall. The stain is what you can see. What put it there is the question.

InterNACHI’s prevention approach is to keep the entire roof cold, which the article describes as sealing air leaks in the attic floor and increasing the thickness of insulation. That’s InterNACHI’s approach, not a set of steps for you. It is a good reason to read the insulation line in a written report slowly.

What Does an Inspection Report About the Roof and Attic?

InterNACHI’s Standards of Practice have the inspector report observed indications of active roof leaks as in need of correction. They have the inspector inspect the ventilation of unfinished spaces, including attics. They have the inspector describe the type and approximate average depth of attic insulation. They also have the inspector report the general absence of insulation or ventilation.

During a home inspection, one of our licensed inspectors performs a visual examination of the structure and all major systems, then documents every finding with photographs so nothing is left to guesswork. The roof, attic, insulation, ceilings and exterior grading are among the areas examined. We compile a detailed report that grades every system and flags items needing attention, and it’s delivered within 24 hours. Ask us what that report will note about the roof edge, the attic and the ceilings.

Our post on what home inspectors see on your roof covers where an inspector’s view of the roof ends and a roofer’s begins.

What Can’t an Inspection See?

Plenty. The Standards say an inspection will not identify concealed or latent defects. Water that has run into a wall cavity can be out of sight. So can water that has soaked in under attic insulation. A ceiling or wall that looks fine doesn’t show you what happened behind it.

Per the Standards, the inspector isn’t required to move, touch or disturb insulation. The inspector isn’t required to determine the adequacy of ventilation either, or to enter an attic that isn’t readily accessible. So wet insulation under a dry top layer may not show up in a report. Neither may an attic whose ventilation is only partly visible.

The Standards also say the inspector isn’t required to walk on any roof surface. They say the same about removing snow or ice that prohibits observing the roof surfaces. Snow cover can hide the roof surfaces from view.

The Standards say the inspector isn’t required to inspect de-icing equipment. So if you spot electric heat cables strung along a roof edge, that’s a question for the seller. Why were they put in? InterNACHI’s article says such cables rarely work.

What to Ask the Seller About Ice Dams

Put your questions in writing, and do it while the contingency window is open. A seller may know what a visual look can’t reach — what the house has been through, and what’s been repaired since. You won’t get that from a photo. Keep each question short and specific.

  • Has the house had ice dams or roof leaks, and when?
  • Have any ceilings or walls near the roof edge been repaired or repainted?
  • Has the attic insulation ever been replaced, or has it ever been wet?
  • Are electric heat cables installed along the roof edge, and why?
  • Is there paperwork for any work done on the roof edge, the attic or the ceilings?

InterNACHI’s article says water from the leak can make paint peel and blister, and that this may happen long after the ice dam has melted. So a freshly painted ceiling near an exterior wall may be nothing at all. It’s still fair to ask what was behind it, and when the work was done.

Our roof post makes a related point: insulation that’s wet or compressed near the eaves often points to ice damming from a previous winter, and that’s a recurring issue in the older housing stock across Bucks and Montgomery counties.

What If the Report Flags a Leak or Wet Insulation?

Treat it as a prompt to ask questions, not as a measurement. Per the Standards, the inspector reports observed indications of active roof leaks as in need of correction. Wet insulation is one of the harms InterNACHI names. The Standards also say inspection reports may include additional comments and recommendations.

Ask your inspector what was visible and what wasn’t. Ask the seller what they know about the roof edge, the attic and the ceilings, while the contingency window is open. Write both sets of answers down. Questions about the agreement of sale belong with your real estate agent.

Our post on what an attic inspection finds covers the ventilation path and the insulation items an attic inspection records.

Frequently Asked Questions About Ice Dams

Do home inspectors check for ice dam damage?

InterNACHI’s Standards of Practice have the inspector report observed indications of active roof leaks. They also have the inspector inspect attic ventilation and describe the attic insulation observed. Ask us what the written report will note about the roof edge, the attic and the ceilings.

Can damage from an ice dam appear months later?

InterNACHI’s article on ice dam hazards says water from the leak can make paint peel and blister, and that this may happen long after the ice dam has melted. It also says the damage may not appear directly related to the ice dam. That’s a statement about how the harm behaves, not a verdict about any particular house.

What causes an ice dam?

InterNACHI’s article says ice dams are formed by an interaction between snow cover, outside temperatures and heat lost through the roof. It adds that the primary contributor to snow melting is heat loss from the building’s interior. And it says gutters do not cause ice dams to form, contrary to popular belief.

Is wet attic insulation a problem?

InterNACHI’s article says wet insulation doesn’t work well, and that chronically wet insulation will not decompress even when it dries. The Standards say the inspector isn’t required to move, touch or disturb insulation, so a dry top layer can sit over something wetter. Asking the seller about the insulation’s history is a reasonable step.

Is ice dam damage part of a full home inspection?

During a home inspection, one of our licensed inspectors performs a visual examination of the structure and all major systems, and documents every finding with photographs. The roof, attic, insulation and ceilings are among the areas examined. Ask us what the written report records about the roof edge, the attic and the ceilings.

Ask About Ice Dams Before You Close

Inspection Professionals’ written report documents every finding with photographs and is delivered within 24 hours, so you can see the evidence for each finding rather than a summary.

As a general rule, a written report gives you something specific to bring to the seller about the roof, the attic and the ceilings. It’s a short list of concrete questions rather than a hunch. Bring it while the contingency window is open.

A full home inspection is the written report to have in hand while you ask.

Buyers in Bucks County, Montgomery County, Philadelphia or Delaware County can contact Inspection Professionals to talk through what a full home inspection documents before weighing ice dam damage in a house you want to buy.