Using Different Types of Squares

Squares Safety Tips

When using a square as a saw guide, try to use a clamp to hold the square so you can keep two hands on the saw.

Be sure to wear gloves when using framing squares, as the edges can sometimes be sharp.

When not in use, always close the blade of a sliding T-bevel square back into the handle. The tip of the blade can be quite sharp.

Avoid dropping any square to preserve its integrity

Combination Square

Has a grooved blade and head that can be adjusted (by loosening the thumbscrew) to many locations along the 12” blade to provide different measurements and for scribing.

One edge of the head (which is usually metal or plastic) has a 90-degree fence for crosscutting while the other has a 45-degree angle for use as a miter square.

The head also contains one level vial to check for level and plumb and a scratch awl for scribing.

Some combination square sets are available with an attached protractor that is movable throughout 180º for setting the blade at any angle within that range.

Drywall Square

Useful tool for measuring and marking 4’x8’ sheets of drywall, plywood and other 4’x8’ building materials.

Often used as a guide to score drywall.

Some models available with adjustable bevel for marking and scoring angles.

Framing Square

90 degree L-shaped tool made from one piece of material (steel or aluminum), with the long end (blade) usually 24" and the short end (tongue) 16".

Also known as carpenter’s or rafter square because this tool is generally used for laying out rafters and marking stair stringers.

Similar squares are also available in other sizes (8" x 12").

Generally has framing tables (rafter and Essex tables) etched into the body to provide information on roof framing.

Also has ruler increments printed on the inside and outside edges.

Try Square

An L-shaped tool used as a guide for pencil markings of 90 degree cuts and to check the edges and ends of boards for squareness.

Also used to determine whether a board is the same depth for its entire length.

Try squares have broad 6" to 12" blades set at right angles, with wood, plastic or metal handles.

Also available is a try/miter square, which features a 45º corner edge.

Sliding T-Bevel Square

Used for locating and transferring any angle between 0 to 360 degrees.

Has a movable blade that can adjust to any angle by loosening and tightening wing nut or locking mechanism.

Available with plastic or wooden handles.

Also used for bisecting angles for mitering when used with a compass.

Folding Square

Square that conveniently folds for easy storage.

Locking mechanism locks tool securely for use.

Angle markings from 0 to 60 degrees.

Often used in tiling projects.

Generally available in sizes ranging from 12”x12” to 48”x48

Measuring Square

A small triangle-shaped square with a flanged edge for butting against the edge of a work piece to draw 90-degree or 45-degree angles.

It has different angle measurements marked on its surface and edges.

Also used as a cutting fence for circular power saws.

Markings on diagonal edge correspond to layout dimensions for rafters and stairs.

Generally available in 7” and 12” sizes.

Courtesy of NRHA.org

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