The temperature was dropping. He reviewed the section on winter concrete works , noting that because the air was below +5°C, he needed to implement heating methods and record every hourly temperature change in the Log of Concrete Works .

He reminded his foreman that the concrete shouldn't be dropped from a height of more than 1 to 6 meters depending on the structure, to prevent the mix from separating.

He checked the minimum protective layer thickness (at least 20mm for indoor slabs) to prevent rust from eating the steel from the inside out.

The wooden "skeleton" had to be rigid. One loose bolt could cause a blowout, wasting thousands of dollars in wet mix.