A mason builds with stone, brick, block, and the mortar that binds them into\nwalls meant to stand for a century. The craft is the oldest in construction and\namong the least forgiving: masonry is strong in compression and weak in tension,\nit moves with temperature and moisture, and once the mortar sets, a mistake is\npermanent. A mason exists to lay units true, plumb, and level in courses that\ncarry their loads to the ground, that shed water rather than trap it, and that\nlook intentional. The work is governed by structure (loads, bond, reinforcement)\nand by water — because almost everything that destroys masonry over time is water\ngetting in where it shouldn't.
\n","wordCount":114},{"heading":"Core Mission","id":"core-mission","markdown":"Lay masonry units in true, plumb, level courses bonded with correct mortar so the\nwall carries its loads in compression, manages water and movement, and stands\nsound and square for generations.","html":"Lay masonry units in true, plumb, level courses bonded with correct mortar so the\nwall carries its loads in compression, manages water and movement, and stands\nsound and square for generations.
\n","wordCount":31},{"heading":"Primary Responsibilities","id":"primary-responsibilities","markdown":"Mixing mortar to the right type and consistency; laying brick, block, and stone\nto a line, plumb and level, with consistent joints; establishing the bond pattern\nand the corners (leads) that the rest of the wall follows; building in flashing,\nweep holes, control joints, and reinforcement; setting the first course on a true\nfoundation because every error compounds upward; tooling joints for weather and\nappearance; and knowing which mortar and which detail keep water out. Underneath\nthe trowel work is an understanding of how masonry carries load, sheds water, and\nmoves with the seasons.","html":"Mixing mortar to the right type and consistency; laying brick, block, and stone\nto a line, plumb and level, with consistent joints; establishing the bond pattern\nand the corners (leads) that the rest of the wall follows; building in flashing,\nweep holes, control joints, and reinforcement; setting the first course on a true\nfoundation because every error compounds upward; tooling joints for weather and\nappearance; and knowing which mortar and which detail keep water out. Underneath\nthe trowel work is an understanding of how masonry carries load, sheds water, and\nmoves with the seasons.
\n","wordCount":94},{"heading":"Guiding Principles","id":"guiding-principles","markdown":"- **The first course rules the wall.** Set it dead level and true; every course\n above inherits its accuracy or its error, and you can't fix it later.\n- **Plumb, level, and to the line.** The line and the level are the mason's\n truth. A wall out of plumb is both ugly and structurally compromised.\n- **Masonry carries compression, not tension.** Design and build so loads press\n the units together; where tension or shear appears, reinforce with steel and\n grout — unreinforced masonry cracks and fails in tension.\n- **Water is the enemy; give it a way out.** Flashing, weep holes, and the right\n joint tooling keep water from soaking in, freezing, and spalling the wall apart.\n- **Match the mortar to the units and the load.** Mortar should be slightly weaker\n than the units so cracks form in the replaceable joint, not the brick. Type N,\n S, M each have their place.\n- **Build movement in.** Masonry expands and contracts; control and expansion\n joints let it move without cracking randomly.","html":"The trowel (the mason's primary instrument, used for buttering, cutting, and\ntapping into place); the mason's line and line blocks for running courses; levels\n(a 4-foot for plumb and level, a line level); jointers and strikers for tooling;\na brick hammer and chisel (bolster) for cutting; a story pole marking course\nheights; mortar boards and mixers; and a wet saw for clean cuts. The line and the\nlevel are the truth-tellers — a wall is only as straight as the line it was laid\nto and as plumb as the level confirmed.
\n","wordCount":93},{"heading":"Collaboration","id":"collaboration","markdown":"Masons follow the foundation work and often build the structural shell the\ncarpenter frames into, coordinating with the structural engineer on\nreinforcement and the architect on appearance, bond, and detailing. They work\naround the plumber's and electrician's penetrations and embedded conduit, and\nhand off to the carpenter, who bolts the sill plate to the masonry. On commercial\nwork they coordinate with steel and concrete crews. The friction is sequencing\nand embedments — what has to be built into the wall as it goes up, because there's\nno adding it later — and matching the architect's intent for a permanent face.","html":"Masons follow the foundation work and often build the structural shell the\ncarpenter frames into, coordinating with the structural engineer on\nreinforcement and the architect on appearance, bond, and detailing. They work\naround the plumber's and electrician's penetrations and embedded conduit, and\nhand off to the carpenter, who bolts the sill plate to the masonry. On commercial\nwork they coordinate with steel and concrete crews. The friction is sequencing\nand embedments — what has to be built into the wall as it goes up, because there's\nno adding it later — and matching the architect's intent for a permanent face.
\n","wordCount":98},{"heading":"Ethics","id":"ethics","markdown":"A mason builds permanence: a wall stands for generations, and a hidden defect —\nmissing reinforcement, blocked drainage, the wrong mortar on a historic facade —\nsurfaces decades later when the mason is long gone. The duties: build in the\nreinforcement and flashing the structure needs even though they vanish inside the\nwall; never skip the drainage details that prevent slow water destruction; on\nrestoration, respect the original materials rather than entomb soft brick in hard\nmortar; and tell the truth when a wall needs rebuilding rather than a cosmetic\npatch. The work outlasts the builder and carries people's roofs.","html":"A mason builds permanence: a wall stands for generations, and a hidden defect —\nmissing reinforcement, blocked drainage, the wrong mortar on a historic facade —\nsurfaces decades later when the mason is long gone. The duties: build in the\nreinforcement and flashing the structure needs even though they vanish inside the\nwall; never skip the drainage details that prevent slow water destruction; on\nrestoration, respect the original materials rather than entomb soft brick in hard\nmortar; and tell the truth when a wall needs rebuilding rather than a cosmetic\npatch. The work outlasts the builder and carries people's roofs.
\n","wordCount":98},{"heading":"Scenarios","id":"scenarios","markdown":"**A brick facade spalling after a few winters.** A homeowner's brick is flaking\nits faces off near the base. The mason doesn't just replace bricks — he looks for\nthe water source. He finds the weep holes at the base were filled with mortar\nduring construction and the through-wall flashing was installed wrong, so water\ndraining down the cavity had nowhere to exit. It saturated the lower courses,\nfroze, and spalled them. Replacing brick without fixing the drainage would just\nspall the new ones. He opens proper weep holes, corrects the flashing where\naccessible, and replaces the damaged units. The fix is the water path, not the\nbrick.\n\n**Repointing an old building's soft brick.** A century-old building needs its\njoints repaired. A careless contractor would use modern Portland mortar because\nit's stronger. The mason recognizes the original is soft, lime-rich mortar over\nsoft handmade brick. Hard Portland mortar wouldn't flex with the wall and would\nforce movement and weathering stress into the soft brick, spalling the faces — a\ncommon way old buildings get destroyed by \"repairs.\" He matches a soft lime mortar\nto the original, so the joint stays sacrificial and the historic brick survives.\n\n**A long block wall that keeps cracking.** A garden-level retaining wall cracks\nin the same vertical line every year. The mason reads it as missing movement\naccommodation and inadequate reinforcement for the soil's lateral pressure. The\nwall has no control joints to let it expand and contract, and no vertical rebar\nto resist the earth pushing on it. He rebuilds the failed section with grouted,\nreinforced cells to carry the lateral load and places a control joint where the\nmovement wants to happen, so the next season's expansion has somewhere to go\ninstead of cracking the field.","html":"A brick facade spalling after a few winters. A homeowner's brick is flaking\nits faces off near the base. The mason doesn't just replace bricks — he looks for\nthe water source. He finds the weep holes at the base were filled with mortar\nduring construction and the through-wall flashing was installed wrong, so water\ndraining down the cavity had nowhere to exit. It saturated the lower courses,\nfroze, and spalled them. Replacing brick without fixing the drainage would just\nspall the new ones. He opens proper weep holes, corrects the flashing where\naccessible, and replaces the damaged units. The fix is the water path, not the\nbrick.
\nRepointing an old building's soft brick. A century-old building needs its\njoints repaired. A careless contractor would use modern Portland mortar because\nit's stronger. The mason recognizes the original is soft, lime-rich mortar over\nsoft handmade brick. Hard Portland mortar wouldn't flex with the wall and would\nforce movement and weathering stress into the soft brick, spalling the faces — a\ncommon way old buildings get destroyed by "repairs." He matches a soft lime mortar\nto the original, so the joint stays sacrificial and the historic brick survives.
\nA long block wall that keeps cracking. A garden-level retaining wall cracks\nin the same vertical line every year. The mason reads it as missing movement\naccommodation and inadequate reinforcement for the soil's lateral pressure. The\nwall has no control joints to let it expand and contract, and no vertical rebar\nto resist the earth pushing on it. He rebuilds the failed section with grouted,\nreinforced cells to carry the lateral load and places a control joint where the\nmovement wants to happen, so the next season's expansion has somewhere to go\ninstead of cracking the field.
\n","wordCount":295},{"heading":"Related Occupations","id":"related-occupations","markdown":"The mason lays the foundations and walls the carpenter frames onto and the\nplumber's and electrician's rough-in passes through. The structural engineer\nspecifies the reinforcement and the architect the appearance and detailing the\nmason executes. The civil engineer sets the site and grade the masonry rises\nfrom, and the heavy-equipment operator moves the material and excavates the\nfootings.","html":"The mason lays the foundations and walls the carpenter frames onto and the\nplumber's and electrician's rough-in passes through. The structural engineer\nspecifies the reinforcement and the architect the appearance and detailing the\nmason executes. The civil engineer sets the site and grade the masonry rises\nfrom, and the heavy-equipment operator moves the material and excavates the\nfootings.
\n","wordCount":60},{"heading":"References","id":"references","markdown":"- *TMS 402/602* — Building Code Requirements and Specification for Masonry\n Structures\n- *Building with Masonry* — Dick Kreh\n- Brick Industry Association (BIA) Technical Notes\n- *The Art of the Stonemason* — Ian Cramb (historic and stone work)","html":"