A general home inspection covers the whole house in a few hours. The roof gets a portion of that, often from the ground or from a ladder at the eave, and the report says something careful about apparent remaining life.
That is not a criticism of home inspectors, who are doing a broad job under time pressure. It does mean that on the single most expensive component of the building envelope, you may be buying with less information than you think.
How many layers are up there
This is the first question and it moves real money.
Michigan municipalities cap shingle layers. Sterling Heights states only two layers of roofing may be applied, and Clinton Township re-roof documentation prohibits installing more than two layers. A house already carrying two layers cannot be re-covered. The next roof is a full tear-off.
Tear-off costs more than an overlay, and it also means whatever is under those layers becomes visible and may need attention. A buyer who knows the house has two layers is negotiating a different number from one who does not.
It can often be determined at the eave edge, where the layers are countable.
What is at the eaves, and how you find out
Ice barrier is the membrane that stops water from an ice dam getting under the shingles. Metro Detroit building departments require it from the roof edge to at least 24 inches inside the exterior wall line.
Once the roof is on, you cannot see it. What you can do is ask for the permit record. If the roof was replaced under a permit, it was inspected. If there is no permit record for a roof that is clearly newer than the house, that is worth knowing, and it is a question the seller can answer.
We went through the detail in the 24-inch ice barrier rule and the permit side in do you need a permit to replace a roof in Michigan.
The attic tells you more than the shingles
Go up, or have someone go up. On a cold morning it is the single most informative ten minutes available.
Look for:
- Soffit vents blocked by insulation. Extremely common, and it means the attic cannot draw air. Whatever the age of the shingles, they are ageing faster than they should.
- Frost on nail points or moisture on the deck underside. Condensation, which stains ceilings and rots decking.
- Staining on the deck. Where it is concentrated tells you where water has come in; where it is general tells you it was condensation.
- A bathroom fan venting into the attic rather than outside. Cheap to fix and expensive to ignore.
- Daylight at penetrations.
- Sagging or delaminated decking between rafters.
A well-ventilated attic under a fifteen-year-old roof is a better purchase than a badly ventilated one under a seven-year-old roof. We covered how to tell the symptoms apart in roof leak or condensation.
The eave, where the money hides
Fascia and soffit damage sits behind gutters and above eye level, and it is missed constantly. Press the fascia. Look at the soffit panels from below for staining, sagging or gaps.
Soft wood at the eave means the gutters cannot be properly refitted until carpentry is done, which turns a gutter line item into something larger. The progression is in what a failed gutter really costs.
Reading the repair history
Patches are not a problem in themselves. Every roof gets repaired.
What matters is the pattern. Several repairs clustered at one chimney, one valley, or one roof-to-wall junction means something there has never been solved, and a new surface over the same detail will do the same thing. Ask what was done and when.
Shape, not colour
Dark streaks on a north slope are algae and cosmetic. Shingles that have stopped lying flat are not. Cupping, clawing and buckling each point somewhere specific, and buckling on a young roof points at installation. Both are covered in reading the shape of a shingle and black streaks on the north side.
Buyers routinely over-react to streaking and under-react to deformation. It is usually the wrong way round.
Using it in the negotiation
A roof with limited life left is not a reason to walk away. It is a number, and numbers are negotiable.
What helps:
- A written assessment with a scope, not a verbal impression
- An estimate for the work that would be needed
- Separation of what is urgent from what is simply finite
- Knowing whether it is a tear-off, because that is the difference between two numbers
Two things worth knowing alongside. Replacing a roof in Michigan does not raise your property tax assessment, because the statute lists it as normal repair — see what the statute says. And insurers increasingly take a view on roof age, which is worth checking before you are the owner rather than after.
If you are selling instead
The same information works in reverse. A written roof assessment in hand, with the permit record, removes a large uncertainty from a buyer mind and takes the roof out of the negotiation. A streaked but sound roof cleaned before photographs is one of the cheapest perception changes available.
Common questions
Is a roof inspection different from a home inspection?
Yes. A home inspection is broad and usually assesses the roof visually. A roofing inspection looks at layers, eave detail, flashing, ventilation and the attic specifically.
How long does a roof last in Michigan?
It depends heavily on ventilation, exposure and installation quality as well as material. Two roofs of the same age in the same subdivision can be in very different condition.
Should I ask for the roof to be replaced before closing?
That is one route. A credit is often easier for both sides, because you then choose the contractor and the specification yourself.
Can you inspect a roof in winter?
Snow cover limits what can be seen on the surface, but the attic can be inspected year round and often tells you more.
Get it looked at before you sign
If you are buying in Macomb or Oakland County and want to know what you are taking on, we will give you a written assessment with a scope and a number. If the answer is that the roof is fine, you get that in writing too.
Book a free roof inspection, or see the areas we cover.
Sources: City of Sterling Heights Building Department FAQ; Charter Township of Clinton re-roof permit application; Charter Township of Macomb residential re-roof requirements.
