to build square corners with the 3-4-5 rule, first measure 3 units from the corner on 1 side. turn in a perpendicular direction from the first line and measure 4 units. then, measure the diagonal between the ends of your 2 lines. if it measures 5 units, your corner is square.
how to square joists for a deck. then he marks the top of the ledger 3 feet from the corner and the top of the side rim joist 4 feet out. finally, he extends his tape measure between the two marks and moves the rim from side to side until the marks are exactly 5 feet apart. at this point, the two pieces are square.
how to square up a deck or wall. using the 3,4,5 rule is demonstrated by contractor john in this video. follow contractor john at contractorjohn.com a
if you left your calculator at the office, there is a simple process to help you make certain that your measurements are accurate. by confirming your deck is built correctly, you will save a lot of time and wasted material. the process used to ensure your corners are at a 90 degree angle is known as 3-4-5 or the pythagorean triple.
a common mistake with diyers is to forget to square the frame up or box. this is a crucial step that must be taken when building a house or when framing a simple deck. some guys/gals prefer to use the 3-4-5 method or the cross over method, i use both
also to make sure the deck is 'square' to the house you can sight the deck visually and also use the 'pythagorean theorem' of 3-4-5. when you measure the frame of the deck at the corners one side should be 3 feet one side should be 4 feet and the hypotenuse or the base of that triangle should be 5 feet.
one thing i make use of on almost every project. knowing how to square things when building anything is very important and essential if you want your projects to turn out the best. some people use a framing square but this is not very accurate since it is so small so we have to learn how to square a carpentry project using a method called 3 4 5.
mark the post for length and use a speed square or combination square to d a line around the post. make sure all the lines meet at the corners. set the saw for maximum depth and saw to the waste side of the first line.
make a few test cuts, angling the saw slightly to cut a slight angle on the end. place the board and check the fit. if it's acceptable, lock the blade on the miter saw so you can cut adjoining deck boards at the same angle. depending on how much the deck is out-of-square, both ends of the deck boards may need to be cut with different miter angles.
how to lay deck boards on a deck that isn't square measure the distance from one corner of the ledger board the rim joist attached to the house measure the lengths of the two rim joists. position an 8-foot-long piece of two-by-six treated lumber on the joists parallel to position a second
then mark 4 feet from post c toward post a. the distance between the marks toward post b and post a should be 5 feet. if not, adjust your posts as necessary. once the measurement is precisely 5 feet, you are ready for the concrete to dry, finish the deck and prepare for your next barbecue.
how to check for square on a four sided frame. to form a square or rectangle frame both the plates top and bottom should be the same length, and all the studs or joists should be the same length as each other as well. once nailed up, to check the structure is square simply measure from corner to corner.
how to keep deck boards square check the squareness of your deck frame corners, where the rim joist meets the end joists, mark the rim joist 4 feet from where its corner meets the end joist, hold the squared deck in place as it awaits the installation of deck boards by screwing address
use the 3-4-5 method to square your deck. the rule, based on basic geometry for a right triangle, ensures that a corner is square. you can use any multiple depending on the size of your deck, such as 6-8-10 in this example.