Section 2: Moisture in subfloors Relative humidity and moisture The map in the Learner guide uses mathematical signals to express than’ and ‘more than’. For example: ‘less 60%’ means less than 60% ‘< 60%’ means more than 60 %. ‘> See if you can find where your own town or city is located on the map. What climatic zone does it fall into? What is the average RH at 9 am? Climatic zone Average RH at 9 am If you live in a regional area and you’re having trouble deciding which band it falls into, go to the BOM map at the web address shown in the Learner guide. It shows many more towns and has more detailed zone bands. Moisture in wood Here’s a moisture content question for you to work out. Let’s say a piece of hardwood flooring weighs 4.4 kg, and the woody fibres in the board weight 4.0 kg. What is the weight of the moisture in the board? What is the moisture content of the board expressed as a percentage? Drying timber to EMC We said earlier that seasoned timber generally has a moisture content of 10 to 15%, unless otherwise specified.
Section 2: Moisture in subfloors Relative humidity and moisture The map in the Learner guide uses mathematical signals to express ‘more than’ and ‘less than’. For example: ‘< 60%’ means less than 60% ‘> 60%’ means more than 60 %. See if you can find where your own town or city is located on the map. What climatic zone does it fall into? What is the average RH at 9 am? Climatic zone Average RH at 9 am If you live in a regional area and you’re having trouble deciding which band it falls into, go to the BOM map at the web address shown in the Learner guide. It shows many more towns and has more detailed zone bands. Moisture in wood Here’s a moisture content question for you to work out. Let’s say a piece of hardwood flooring weighs 4.4 kg, and the woody fibres in the board weight 4.0 kg. What is the weight of the moisture in the board? What is the moisture content of the board expressed as a percentage? Drying timber to EMC We said earlier that seasoned timber generally has a moisture content of 10 to 15%, unless otherwise specified.
inspecting_testing_subfloors_workbook.docx