Dictionary of Moisture Protection & Restoration

Dry joint =

Joint without mortar.

Dwarf wall =

A wall or partition which does not extend to the

ceiling.

EBM =

Engineered Brick Masonry.

Efflorescence =

Powder or stain

that forms on

mortar, concrete,

bricks or stone;

usually caused by

moisture leaching

out salts from the material in the masonry. The

remedy is simple: stop the moisture intrusions

and allow the migration of the salts to take place;

then remove the efflorescence by dry brushing

or scraping. Acid washing the efflorescence will

only dilute the salts, forcing them back into the

substrate, only to migrate back later on.

Expansion joint =

A joint or gap between adjacent parts of a

building structure or different materials that have

different thermal expansion rates. (

see control

joint for material movement due to a different

cause).

Extrados =

The outer curve on

a masonry arch; as

opposed to intrados.