Contact

Report a number that looks wrong

Write to [email protected]. That address reaches the people who maintain the site, and it is read every day; a report that needs a reply gets one.

A report that can be acted on: the page address, the figure you think is wrong, and — if you have one — a supplier page or a published figure. That is the fastest route to a correction.

Every constant on the site has a register key, a source and a date, and every worked example is reproduced by a test. A report is checked against those, and a confirmed error is corrected on the page with the date it was corrected.

What we cannot answer

We cannot tell you what depth, base, drainage or soil your project needs, or which supplier to use. Those are design and sourcing decisions, and this site deliberately stays out of them.

Where the data stands

Every register row is sourced and dated, and no source is outstanding. That does not make the figures beyond correction. REG-05 rests partly on retailer catalogues and on arithmetic over a manufacturer's yield statement; REG-05m rests on product names rather than body text; REG-06's slab figure comes from a single sod farm. If your supplier states a different bag size, pallet coverage or piece size, that is exactly the report this page exists for.