A construction worker inserts a foam backer rod into an expansion joint in a concrete slab before applying sealant.
Keywords
concrete,
construction,
floor,
men at work,
hand,
glove,
foam,
installation,
work,
preparation,
building,
industrial,
material,
gap,
filler,
waterproofing,
foundation,
slab,
detail,
closeup,
ground,
cement,
professional