TUCKPOINTING MORTAR
About this calculator
This tuckpointing calculator estimates the mortar volume and 80-lb bag count needed to repoint deteriorated joints in a brick or stone wall. Volume comes from joint linear feet × joint width × repoint depth; the Brick Industry Association recommends a minimum repoint depth of 2× joint width and never less than 5/8 in for soft mortar. A standard 80-lb bag of Type N or S yields about 0.6 ft³ once mixed. The calculator builds in 15% waste because tuckpointing involves a lot of small applications and partial-bag cure-offs. ESTIMATE ONLY — for historic buildings, mortar mix must match the original by composition and hardness; verify with a preservation mason before purchasing.
How to use this calculator
Enter the total joint linear feet to repoint. For modular brick walls, allow ~7 lin ft of joint per ft² of wall (head + bed joints combined) — so a 100 ft² wall has roughly 700 lin ft of joint.
Pick the joint width: modern walls are typically 3/8 in, but older buildings vary 1/4 to 5/8 in (measure several joints — they vary). Set the repoint depth in inches. BIA recommends a minimum of 2× joint width and never less than 5/8 in. The calculator returns mortar volume, bag count, and a depth check against the BIA minimum.
Worked example
For a 200 ft² brick wall section needing repointing (about 1,400 lin ft of joint at 3/8" width, 3/4" repoint depth):
Mortar volume: 1,400 × 12 × 0.375 × 0.75 = 4,725 in³ = 2.73 ft³.
With 15% waste: 3.14 ft³. Bags: ⌈3.14 ÷ 0.6⌉ = 6 bags of 80-lb Type N or S.
At $7-$10 per bag: $42-$60 in mortar. The labor is the real cost — a tuckpointing pro charges $2-$5 per linear foot of joint, so a 1,400 lin ft job runs $2,800-$7,000 in labor.
For historic buildings: matching the original mortar matters. 19th-century mortar is typically lime-based (much softer than modern Portland-cement mortar). Using harder modern mortar in historic walls causes the brick face to spall as freeze-thaw cycles push the brick instead of the joint. Hire a preservation mason for historic work.
For a small DIY job (50 lin ft): mortar volume ~0.1 ft³ → 1 bag covers 6× that. Most DIY tuckpointing is over-bought because you can't buy partial bags.
Common mistakes & waste factors
Repointing too shallow. BIA minimum is 2× joint width, never less than 5/8". Going only 1/4" deep means the new mortar has no anchorage and falls out within years.
Using modern Portland mortar on historic walls. Pre-1920s buildings used lime mortar (softer, more flexible). Hard Portland mortar in those walls causes brick spalling — the brick face cracks because the mortar is now stiffer than the brick.
Repointing during freezing weather. Mortar cures by hydration and won't set below 40°F. Cold-weather repointing fails within months. Tuckpoint April-October in northern climates.
Skipping the rake-out step. You must remove the deteriorated mortar to the proper depth BEFORE repointing — typically with a tuckpointing chisel, angle grinder with a tuckpointing wheel, or both. Slapping new mortar over old isn't tuckpointing, it's skim coating.
Rules of thumb
Joint length per ft² of brick wall: ~7 lin ft (head + bed joints).
80-lb bag of Type N or S yields ~0.6 ft³.
BIA repoint depth: minimum 2× joint width, never less than 5/8".
15% waste minimum for tuckpointing — small applications and partial-bag cure-offs add up.
Labor: $2-$5/lin ft from a pro mason. DIY pace: 50-100 lin ft per day.
Historic (pre-1920s): match original lime mortar composition, not modern Portland. Hire a preservation specialist.
Never tuckpoint below 40°F. Apply, then mist for 2-3 days to slow cure and prevent shrinkage cracks.
Common questions
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