Your Roof Might Not Need Replacing

Nobody in this trade wants to say this out loud, so we will. A large number of the roofs getting torn off around here right now did not need to come off yet.

They were structurally fine. Solid decking. Intact flashing. No leaks. The shingles had just dried out, gone chalky, and started dropping granules into the gutters. That roof does not need thirty thousand dollars. That roof needs to be sealed.

Why shingles actually fail

Asphalt shingles do not usually fail because something broke. They fail because they dry out. The oils that keep a shingle flexible cook off in the sun, year after year, until the shingle goes brittle, curls at the edges, and starts to crack. At the same time the granules, which are basically your roof's sunscreen, wash away and leave the asphalt underneath exposed to UV. Then the clock speeds way up.

What sealant does about it

A spray-applied sealant penetrates the shingle and restores that flexibility so it can move with the weather instead of shattering. It binds the remaining granules down and stops the bleed. The roof sheds water again, holds its edge against wind, and takes a hail hit without the brittle shatter you get from a dried-out roof. It also stops looking chalky and grey and goes back to a deep, rich color.

When sealant is the wrong answer

Sealant cannot save a roof that is actually failing. If the decking is soft, the flashing is shot, or there is active leaking, sealing it is throwing money at a roof that needs to come off. We will tell you that. It is the entire reason the inspection is free: to find out which roof you have before you spend anything.

How to tell which one you have

This comes down to condition, not age. And here is the part most people get backwards: the earlier you seal a sound roof, the more life you lock in. Sealant is not a last resort you save for a twenty year old roof. A roof drying out at seven or ten years is a better candidate than one barely hanging on at twenty.

• Good candidate: solid decking, intact flashing, no leaks. Shingles that are starting to dry out, go chalky, and drop a few granules, but have not failed. Whatever the age, if the roof is still sound, sealing it now buys you years.
• Needs replacing, not sealing: active leaks, soft or spongy decking, widespread cracking and curling, or flashing that has failed. By the time most roofs around here hit fifteen to twenty years they are in this column, which is exactly why sealing earlier is the smarter money.
• Either way: you should know which one you have before somebody sells you the expensive one.