BRICK WALLS

most materilas expand with an increase in moisture content

AND

Contract with a loss of water

BRICK

is smallest in size when it cools

after coming from the Kiln

(High Temperature)

AND

Will expand slowly upon exposure

to water or humid air

Besides

INSULATION EXPOSES BRICKS

to climate extremes

THERMAL EXPANSION AND

CONTRACTION IS MAXIMIZED

WINDOW AND DOOR

OPENINGS

break the uniformily of walls

The differential movement

CAUSE CRACK

PICTURE: Cracks around openings are not uncommon in brick walls

PICTURE: Cracks are not uncommon at non-symmetric brick walls

Picture: Harmless crack in brick wall.