Methodology
Last updated November 9, 2026
Every number on this site is either sourced or labelled as an estimate. This page explains the difference, and how a claim gets from a source document to a published page.
1. Primary sources first
Material claims come from the sealant manufacturer's data sheet: solids content, coverage rate, cure time and the surface conditions that void the warranty. Asphalt guidance follows the specifications and pavement-maintenance publications named on the page. Cost bands come from published US price guides, with the month checked stated.
2. Cost models show their inputs
Installed cost is modelled from visible inputs: the material or equipment price, the labour and access scope (excavation, drain, electrical, permit), consumables, and a reserve for service or repair. We do not present a single "average cost" as if it were a quote; the range and what it includes are stated on the page.
3. How options are compared
We compare treatments on the pavement condition they address, coverage and solids content, expected life, and the weather window each needs. A treatment earns a recommendation for a stated pavement condition; no contractor can buy a place in a comparison.
4. What we have not tested
We do not run a laboratory or a crew, and we do not carry out every job we write about. When a claim comes from a manufacturer document, an adopted code, a certification listing or a contractor report, we say which. We do not imply first-hand testing we did not perform.
5. Sources we work from
| Source type | What it decides | How it is cited |
|---|---|---|
| Sealant manufacturer data sheets | Solids content, coverage rate, cure time, rain restrictions | Document and product named |
| Emulsified-asphalt specifications | What a sealcoat product is actually made of | Specification named |
| State DOT pavement-maintenance guidance | Crack filling, patching and surface-treatment practice | Publication named |
| State and local licensing boards | Which registration or licence a contractor must hold | Board named, with its lookup link |
| Published US price guides | Installed cost bands per square foot | Band with the month it was checked |
When two sources disagree, the page says which one it followed and why. A figure that cannot be traced to a document is labelled an estimate, and an estimate is never presented as the price of a specific job.
6. Listings and directory data
The service-area directory is compiled from public business records: the firm's own website, its published address and phone number, and the state or local licence register named on the city page. A record is marked verified only when the name, address, phone and licence have been checked against those sources and the date of the check recorded; everything else is labelled. Where a source does not publish a ZIP code or a website, the field is left blank rather than guessed.
7. Corrections
If a code, a specification or a listing changes, we update the article and its "last updated" date. Emailcontact@drivewaysealinglab.com with the page and the correction.