Mason’s Line

This light duty synthetic line is often strung between stakes to act as a guide when laying bricks. Usually, but not always, brightly colored so that the line is easily visible against the many different color tones of a course of bricks the line will be carefully levelled and used as a guide by a bricklayer to insure that the bricks are level and straights. This light duty twisted twine has good strength and moderate stretch characteristics and has also found its way into a number of other uses that typically revolve around bundling items together or using the brightly colored versions for craft projects.

masons line

Rope Selection Guide

Polypropylene Nylon Polyester Cotton Manila/Sisal/Jute Clothesline
Shock Load Ability
Floats or Sinks in Water Floats Sinks Sinks Sinks Sinks Sinks
Melting Point 330°F 480°F 500°F Burns Burns 500°F
Abrasion Resistance
Resistance to Sunlight
Resistance to Rot and Mildew
Resistance to Oil and Gas
Flexing Endurance
Store Wet or Dry Wet or Dry Wet or Dry Wet or Dry Dry Only Dry Only Wet or Dry
Stretch Resistance

Reference Chart

Trade Size Imperial Size
#3 3/32″
#4 1/8″
#4.5 9/64″
#5 5/32″
#6 3/16″
#7 7/32″
#8 1/4″
#10 5/16″
#12 3/8″

Rope Construction Guide

Double Diamond Braid Diamond Braid Twisted Smooth Braid Hollow Core
Spliceable No
Flattens Under Load No Yes No No Yes
Rotates Under Load No No Yes No No
Knot-Holding Ability


Solid Braid = Smooth Braid
Sash Cord = Cotton or Polypropylene Cord
Derby Rope = Solid/Smooth Braid Polypropylene
Double Braid is NOT the same as Diamond Braid
Seine Twine = Diamond Braid Twine
Mason’s Line = Twisted Twine
Maypole = Diamond Braid