What is likely due on your roof, and what is not

A roof is a set of parts on different clocks, and they rarely reach the end together. Tell it when the house was built, what covers it and what has already been done, and it will show you where each part sits.

This is not a diagnosis and not a prediction. It compares ages against service-life ranges widely used in the trade. A covering can fail at ten years or last past twenty; exposure, ventilation and installation quality matter more than the calendar. Use it to decide what to look at, not what to buy.

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When was the house built? What heats and cools it now?

What has already been replaced?

Leave a row as Original if it has never been done, or if it was done before you owned the house and you have no record of it.

The covering itself Vent boots and penetration seals Flashings at walls, chimneys and transitions Fasteners, drip edge and valley metal Underlayment The decking Gutters and the roof edge Skylights and other openings (if applicable)

Six places a roof gives way here. Only one of them is the part everyone looks at. Which is why the boots, the flashings and the hardware are worth knowing the age of, not just the shingles.

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1 Ridge and exhaust — Where the attic is supposed to breathe out. Sized in 1975 on half this arc.
2 The shingle field — The part everyone looks at. The sun works it from above, the attic from below.
3 The valley — Every afternoon’s rain, funnelled into one seam.
4 Wall flashing — Where the garage roof meets the house. Rebuilt metal outlives the shingles; caulk does not.
5 The vent boot — A rubber collar on a faster clock than the roof around it. The arc’s most common leak.
6 Eaves, drip edge and soffit intake — The hardware salt reaches first, and the intake the attic breathes through.

Why the age of the shingles is not the age of the roof

A re-roof usually swaps the covering and keeps much of what surrounds it: flashings sealed rather than rebuilt, hardware reused, vents reinstalled. The field resets; the junctions do not. That is why the tool asks about the flashings and the hardware separately, and why the honest answer for many houses is that nobody knows, because the record of past work left with a previous owner.

The same applies in reverse: a house can carry a young covering over corroded valley metal and brittle boots, and the first ceiling stain will read as shingle failure to everyone who does not climb. If a report blames the field without ever mentioning the metal, the useful follow-up question is what the flashings looked like.

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This tool may be reproduced or linked to freely, with attribution to flatwoodsroofing.com. If it is useful to a homeowners association, a housing counsellor or a community group, it is meant to be shared.

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