InstaBidsWhat is efflorescence?
CMHA says "Efflorescence is a deposit of soluble salts and bases, usually white in color, that sometimes appear on the surfaces of masonry or concrete construction." (read 2026-11-03). CMHA says "Although it may be an aesthetic concern, efflorescence will not affect structural performance." (read 2026-11-03).
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What this means for your home project
- CMHA says "Before any effort to remove the efflorescence is undertaken, the reason for the efflorescence should be established." (read 2026-11-03). Source: CMHA, read 2026-11-03.
- CMHA says "If “late age efflorescence” is observed, the possibility of water leakage should be investigated." (read 2026-11-03). Source: CMHA, read 2026-11-03.
- Interlocking Concrete Pavement Institute says "Always conduct a test in a small, inconspicuous area before applying any cleaner to the entire area of concrete pavers." (read 2026-11-03). Source: Interlocking Concrete Pavement Institute, read 2026-11-03.
- Interlocking Concrete Pavement Institute says "After cleaning, the pavers should be completely dry and free from efflorescence prior to applying any sealers." (read 2026-11-03). Source: Interlocking Concrete Pavement Institute, read 2026-11-03.
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What are the causes of efflorescence?
CMHA says (read 2026-11-03): “First, there must be soluble compounds in the masonry.” Source: CMHA, read 2026-11-03. “Second, moisture must be present to pick up the soluble salts and carry them to the surface.” Source: CMHA, read 2026-11-03. “Third, some force—evaporation or hydrostatic pressure—must cause the solution to move.” Source: CMHA, read 2026-11-03.
Why does efflorescence keep coming back?
CMHA says (read 2026-11-03): “If the deposit is heavy and essentially shows as white streaks immediately below mortar joints or covering localized areas of the masonry, it indicates that water has entered or is entering the wall at a higher elevation.” Source: CMHA, read 2026-11-03. “Late age or recurrent efflorescence usually consists of more permanent surface accumulations and indicates a need for corrective measures.” Source: CMHA, read 2026-11-03. “In any case, the problem should be repaired prior to removing the efflorescence.” Source: CMHA, read 2026-11-03.
Can efflorescence be removed?
CMHA says (read 2026-11-03): “In general, most efflorescence can be removed by dry brushing followed by flushing with clean water.” Source: CMHA, read 2026-11-03. “The use of water to remove surface accumulations, including efflorescence, will cause additional water to enter the wall particularly if it is applied under high pressure.” Source: CMHA, read 2026-11-03. “This water may promote further efflorescence.” Source: CMHA, read 2026-11-03.
Will efflorescence on concrete pavers go away naturally?
Interlocking Concrete Pavement Institute says (read 2026-11-03): “Over time, rainwater can wash and wear it away.” Source: Interlocking Concrete Pavement Institute, read 2026-11-03. “In urban areas with acidic rainfall, efflorescence may go away faster than in rural areas.” Source: Interlocking Concrete Pavement Institute, read 2026-11-03.
When will efflorescence on concrete pavers stop?
Interlocking Concrete Pavement Institute says (read 2026-11-03): “If you live in an area of frequent rain and sunny days, efflorescence and its passing may occur quickly.” Source: Interlocking Concrete Pavement Institute, read 2026-11-03. “The process may take much longer in drier climates.” Source: Interlocking Concrete Pavement Institute, read 2026-11-03. “Typically, efflorescence will stop developing in approximately 18 to 24 months.” Source: Interlocking Concrete Pavement Institute, read 2026-11-03.
How can we prevent efflorescence?
Brick Industry Association says (read 2026-11-03): “Architects and specifiers can refer to ASTM C1400, “Standard Guide for Reduction of Efflorescence Potential in New Masonry Walls,” which provides guidance to reduce the possibility of efflorescence in new buildings.” Source: Brick Industry Association, read 2026-11-03. “Consequently, low-alkali cement should be specified when available to minimize the potential of efflorescence and new building bloom as well.” Source: Brick Industry Association, read 2026-11-03. “Specifying potable water and clean, washed sand for mortar or grout is recommended.” Source: Brick Industry Association, read 2026-11-03.
Sources
- Control and Removal of Efflorescence — TEK 08-03A (Concrete Masonry and Hardscapes Association) — CMHA; published Publication date not stated in captured excerpt; read 2026-11-03.
- Managing Efflorescence on Concrete Pavers — a guide for consumers — Interlocking Concrete Pavement Institute; published Publication date not stated in captured excerpt; read 2026-11-03.
- Efflorescence Prevention and Control — Brick Brief, August 2009 — Brick Industry Association; published 2009-08; read 2026-11-03.