Causes of Efflorescence Roanoke VA

Efflorescence usually occurs when water saturates masonry walls and dissolves water salts within the mortar and brick. These salts are deposited on the surface of the masonry as the water evaporates.

Townside Construction Co Inc
(540) 444-0555
608 S. Market St.
Salem, VA
 
Precision Home Improvements Inc.
(540) 314-7488
5615 Malvern Rd NW
Roanoke, VA
 
Structures Design/Build, LLC
(540) 774-4800
5104 Bernard Drive
Roanoke, VA
 
Central Vacs Unlimited, Inc
(540) 334-2067
PO Box 238
Boones Mill, VA
Services
Central Vacuum Installation
Membership Organizations
Roanoke and National Home Builders Association

ABSOLUTE INSULATION LLC
(540) 384-6800
8383 Arabian Lane
Catawba, VA
Services
Spray Foam Insulation
Membership Organizations
BBB, RRHBA,NRVHBA

Premium Steel Building Systems, Inc.
(540) 981-2483
1568 Granby Street, NE
Roanoke, VA
 
Bratton Masonry
(540) 597-3801
338 elm street
vinton, VA
 
House of Doors
(540) 765-2173
1390-C Southside Dr
Salem, VA
 
Serenity Construction
(540) 353-0952
sky lane
Blue Ridge, VA
 
Paragon Construction Company
12747 Oak Lake Court
Midlothian, VA
Membership Organizations
Better Business Bureau, James Hardie Preferred Remodeler

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Causes of Efflorescence

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Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: January 1, 2002

I have seen efflorescence on many buildings, especially right after construction. I heard that efflorescence deteriorates masonry walls.

How does efflorescence break bricks and mortar apart?

Efflorescence usually occurs when water saturates masonry walls and dissolves water salts within the mortar and brick. These salts are deposited on the surface of the masonry as the water evaporates. There are several possible source of moisture, including water penetration or condensation from moist air.

Salts also deposit below the surface. This action sometimes occurs when coatings on the surface of the masonry penetrating sealers restrict evaporation and the migration of salts to the surface. Spalling can occur when these salts crystallize below the surface.

The problem is particularly severe when there are excessive sulfates in the brick units. Efflorescence that contains sodium sulfate can exist in two crystal states: anhydrous (without water) and hydrous (with water). In its hydrous state the crystal occupies more space than its anhydrous state. Spalling of the brick and mortar can occur if the salt crystals cycle between these two states.

Sodium sulfate can occur in brick units that are not fired at high enough temperatures or if insufficient quantities of barium carbonate were added to the raw materials. Barium carbonate is often added to control soluble sulfates in the units. Barium precipitates the soluble sulfates in the presence of moisture.

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