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14.02.2021Once nailed up, to check the structure is square simply measure from corner to corner. If the measurements aren't the same, pull the long corner towards the middle of the structure until they even out. Once identical, the framework is perfectly squared. Nail a batten temporarily across three or four joists or studs to hold it square until secured in place.
This is also a good way of checking wall plates are square before fixing them in place before you start cutting roof rafters.
Sometimes you don't have four corners to measure and so a different method is required to check for square right angle corners. This could be for example when building interior walls and setting down L shape wall plates.
The picture below tells you all you need to know to check that a frame, wall or other structure is square using the 3 4 5 rule. When you measure down one side 3 and the other 4 the measurement between the two points should always measure 5 if the corner is 90 degrees. It doesn't matter which unit of measurement you use, as long as you keep it the same for all three sides.
When I use this method to put down two base plates I fix one plate in place and move the other round until I get a perfect '5' and then fix that too.
The reason this works is because of the ancient check for square formula - Pythagorus theorum. Add them together and you get 25 which is also 5 x 5. There are also lots of different types of carpenters squares available to check for square on a smaller scale and for marking square lines when setting out. What's New? Roof measurement methods: these articles explain various methods for measuring all roof data: roof slope or pitch, rise, run, area, and other features.
This article series gives clear examples just about every possible way to figure out any or all roof dimensions and measurements expressing the roof area, width, length, slope, rise, run, and unit rise in inches per foot. For a complete on-line guide to identifying and using all of the tables on a framing square.
Here we provide downloads of framing square instructions, historical documents, and more information about the framing square or carpenter's square or steel square, including early framing square patents, and framing square use guides.
Illustrated here, the Chappell framing square by Steve Chappell, cited just below. The framing square Brace Triangle Table , also referred to as the Brace Rule - is discussed in a separate article now found. Found on the back of some older framing square blades the Essex Board Measure - discussed in detail.
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