As of 10 November 2026, The Insulation Book has published no corrections. When we get something wrong, we fix the page and record the fix here, with the date, the page and what changed. Found an error? Here is how to report it.
General information, not professional advice. Building codes are adopted locally, with changes, and your building department decides what applies to your house. Where one of our pages marks a stop, stop and call a qualified professional.
An empty log does not mean our pages are free of mistakes. It means no error has been corrected yet. ENERGY STAR revises its tables, model codes come out in new editions, makers reissue their coverage charts, and rebate programs and energy prices change. Each page gets a fact-check against its sources, as our editorial policy explains, but no check catches everything.
Corrections log
No corrections have been published.
What counts as a correction
A correction is a change to something a page got wrong, such as an R-value target, the climate zone it applies to, a thickness, a bag count, a clearance, a vent ratio, a percentage, a price, a date, a code section or its edition, a product’s publication number, a safety line, a source’s description, a sum or a calculator result. It also covers a page that stayed unchanged after its source moved on, leaving a reader with an out-of-date figure.
Routine work is not logged here. That means fixing a typo or a broken link, adding a new section or a newly read source, or our scheduled rechecks, as our how we check page describes. A page shows an updated date only when its content really changed.
How we correct an error
- We check the claim against its source, such as the ENERGY STAR table or guide, the EPA or CPSC page, the section of the Code of Federal Regulations, the model code section and edition, or the maker’s sheet, and rework any sum it affects.
- If the page is wrong, we fix it, along with any other page, table, graphic or calculator that uses the same figure, and show the new updated date. A wrong safety line, clearance or stop is fixed first.
- We add an entry to the log above with the date, a link to the page, what it said and what it says now.
If the source does not settle the question, we remove the claim or say plainly that it is not confirmed. If the source supports the page as written, the page stays as it is. Advertisers have no say over what we publish, so a report from a maker, an installer, a contractor or an advertiser is checked the same way as any other.
How to report an error
Use our contact page or email contact@theinsulationbook.com, and include:
- the address of the page
- the sentence, figure, rule or calculator result you think is wrong
- a link to the official page, regulation, code section or maker’s sheet that shows the right answer, if you have one
Please leave out details of your own house, and don’t send photos, quotes or reports. We can’t inspect a house, review quotes or recommend contractors. Our pages are general information, as our disclaimer sets out. Check a figure with its source, the label on the product in your hands and your building department before you rely on it.