The tension solution uses a rod or a cable and turnbuckle as shown to keep the frame from twisting out of square.
How to build a wooden gate that won t sag.
Once you ve designed the frame and built it all you need to do now is attach flat planks evenly over the front of the frame to finish your basic wooden gate.
Mount another bracket diagonally at the lower corner of the gate on the latch side.
How to build a no sag large gate that needs no wheels or cables.
Clamp a fence board on either side of the opening.
Either by ensuring that it is very solidly concreted into place or by guying it from its top to the bottom of the next fencepost along.
The first two strategies for building a no sag gate involve the principle of triangulation.
Run a string from one to the other and check the level.
Paul is confident that one board will need to be cut because the ground is not flat.
Set the board that will need to be cut upside down butting the top to the ground.
Attach a metal bracket to the upper corner of the gate on the hinge side.
Make lap joints without a table saw here https youtu be tkc99jjwzce.
Measure planks from the top to the bottom of the frame and cut them accordingly.
Tension rod with turnbuckle.
Firstly make sure that the gatepost itself can t move.
Lay a carpenter s square on one corner of the frame.
Setting the gate in place.
As you tighten the turnbuckle the latch side of the gate rises.
Introducing a diagonal to stabilize the square frame.
Leave the opposite ends of the braces unattached.
Attach cables to each corner bracket and then to the two ends of a turnbuckle.
Attach each brace to one framing member with two evenly spaced screws 2 inches apart.
They stop the gate from sagging by racking when it s supported only on one side by its hinges.