what methods are used to check if a building is square?

Question

starting my own extension building co and cant remember the maths used to check if a particular corner of a building is square

Answer 1

One way is to measure from the corner to a point precisely 6 feet from the corner and carefully mark that point.. Then measure down the adjoining wall a distance of exactly 8 feet and carefully mark that point.

Now measure the distance between the two points. If the distance is exactly 10 feet, then the corner is square. If the distance is less than 10 feet then the corner angle is less than 90 degrees. If the distance is greater than 10 feet then the corner angle is greater than 90 degrees.

Needless to say, it is important that your measurements are as accurate as possible.

Answer 2

Simple, measure the diagonals of the square and they should be the same. To set out a square, use the 3-4-5 method where the L shape is the 3 and 4 metres say, and the angle is 5 metres

Answer 3

If the four sides are equal and one angle is 90 degree, then it is a square.

You can easily verify whether the sides are of equal lengths by measuring them.

To check whether one angle is 90 degree, STBS has given you the answer.

Take a rope of length (12 meter or 12 yard or 12 units)

Have knots or marks at 3, 4 units. Join the two ends with a knot.

If we stretch the three sides it will form a perfect right angled triangle. Use the right angle formed by this square to verify the angle in the wall.

Answer 4

I would build a straw bale house with a steel frame as we have termites on our farm. I live in farm country so finding a farmer to custom grow/bale straw would be super simple and there is a steel source within 25 miles of the farm. I would think Adobe would need a fairly dry climate I don't know much about Cob other than they make really cool looking houses. Have you thought about a hybrid using 2 or more of these techniques together?

Answer 5

very few would be square in shape-anyway a square has 4 sides-not just 1 corner

Answer 6

The 3,4,5, method.
Measure out from the corner of the room 3 one way 4 the other,
measure from these two points , it should equal 5.
Use metric or imperial.

Answer 7

T square and plumbline

Answer 8

use a set square or use theorum of pythagoros

the square on the hypothenus is equal to the sum of the squares on the other 2 sides....

Answer 9

Rule of thumb

Answer 10

how about a spirit level, a set square and plumb-bob-line?