A brick line has to be pulled tight over the full run and stay tight, which is what the material determines. Polypropylene and polyethylene stretch differently under tension, and a line that gives as the course goes up leaves the middle of the wall low. Line pins hold the line at each end and are set into the perpend joint rather than clamped to the brick.
Length is chosen against the longest run rather than the average. 36m covers most domestic work and 100m covers a full site frontage, and running two shorter lines joined is worse than one long one because the join is where it sags. Buying a longer line than the run needs costs little and removes the join entirely.
Colour is a working choice rather than a preference. A line has to be visible against the brick and against the ground behind it, which is why orange, pink, yellow and white are all held rather than one standard colour. Nylon hanks are held in 6 x 18m lengths where a reel is more than the job needs.
Chalk lines mark rather than level, and chalk is bought by colour to suit the surface: blue, red and yellow in 115g bottles. Brick jointer trowels at 13mm finish the joint once the course is laid. Send the run length to 07754288583 on WhatsApp. Chalk is a consumable and is bought by the bottle rather than with the line. Jointer widths are chosen against the mortar bed rather than the brick.
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