1. I don't use sites, I buy directly from shops.
Shops in Romania size building materials in feet/inches? If I go to a shop here in the Netherlands I won't find any measurement in imperial. Literally everything is in metric, and metric only. That includes wood and drywall dimensions.For what it's worth, luckily the materials themselves are the same size, whether they are sold in imperial or metric sizes. For example a sheet of plywood here is 122cmx244cm or the equivalent in imperial 4'x8'. It seems that the physical sizes are standardized world wide.
Your mixed usage of imperial and metric should not be a problem for this, besides some number conversions. In general the sizes of raw building materials aren't exactly... exact
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