A brochure, not a lab.
Most roof-coating numbers arrive with no test, no date and nobody's name on them.
Published data. Verified claims. No guessing.
Ask the last guy where his number came from.
Every number here carries its status: published, under review, or blocked.
Motion study derived from a licensed 2017 photograph. Cameron Henderson / Wikimedia Commons / CC BY-SA 4.0
Bridge archive / verification in progress
Incheon Grand Bridge
A legacy formula-owner file names this project. Independent searching confirms the bridge itself, not yet the product application, and not the inherited maintenance-performance story.
- Bridge identity
- Confirmed
- Archive association
- Internal source
- Product application
- Recorded in the formula owner’s files
- Performance history
- Not derived from the bridge — measured on your roof
Where the number came from
Somebody else’s number is doing the selling.
We read off the producer's table.
Three published figures, and we do not state a fourth.
0.88published initial solar reflectance
You keep the paperwork.
Every figure here names who published it.
0.74published reflectance at three years
What we do publish
The numbers we will stand behind.
The only performance figures this site states as fact. Any temperature or energy story stays in the ledger until a measured record exists.
Published radiative split
0.88Reflected away
0.12Absorbed residual
0.89Emittance, releases the residual
Producer-published values. Match the stocked formula and batch before quoting a roof.
We publish the number that ages.
0.88 new. 0.74 at three years. Same published table.
The less flattering number
Day one is half the record.
The less flattering number, and the more useful one. Leaving it out would make day one misleading.
Aged performance
0.88
Initial0.74
Year 3, publishedReflectance falls as a roof weathers. A brand that only publishes day-one numbers is showing you the easy half of the record.
One public language system
Usable. Review. Blocked.
usable
Published radiative properties
0.88 initial solar reflectance, 0.89 thermal emittance, 0.74 at three years, from the producer's published table. Match the stocked formula and batch before quoting.
review
Class A and fire-test language
Legacy files reference several tests and ratings. The report, product, substrate, assembly and current listing scope are not yet assembled into a publishable claim, so we make none.
usable
Incheon Grand Bridge application
The formula owner's files record this application. We publish where the formula has been used, and derive no service life or performance from it.
blocked
Guaranteed temperatures or savings
Roof, climate, insulation, HVAC and use all vary. No cooling or energy result is promised before a measured field record exists.
blocked
R-value, fireproof or total UV claims
These overstate what the evidence establishes and are not part of the Sundown Coatings position.
Usable. Review. Blocked.Evidence discipline: Usable. Review. Blocked.. We publish the status, not only the headline.. 0.74 at three years, in writing.. No promised temperature. Ever.
Read past the headline
The current public source set.
01
Producer property table
Initial and aged reflectance, emittance, SRI.
Open source ↗02EPA cool-roof guidance
Category research: mechanism, variables, tradeoffs.
Open source ↗03Cool Roof Rating Council
What a radiative rating does and does not establish.
Open source ↗04FTC advertising record
Why savings claims need rigorous substantiation.
Open source ↗