Installation Guide

23
Conditions
Texturing Problems
(cont.)
Texture Buildup
Joint Show-Through
Joint Shows Through
As White Band
Shrinkage Problems
Shrinkage
Delayed Shrinkage
Misinterpreted
Shrinkage
Miscellaneous Problems
Pock Marking
Probable Cause
Spraying or texturing over surfaces
with major differences in surface
porosity or suction (improperly
primed). Thin texture will tend to
build up over high suction surfaces.
Over-extended and over-thinned
primer won’t adequately hide the
contrast between finished joints
and Gypsum Board paper.
Spraying over unprimed surfaces
during cool, humid, slow drying
conditions. Joint stays white, water
solubles in Gypsum Board paper
bleed through.
Compound used too thin or
watery. Applied too soon after
mixing. Improper drying between
coats. Painting before joints are
thoroughly dry. Too deep fills in
one coat. Slow drying.
Improper drying conditions.
Painting before compound and
wallboard are thoroughly dry.
Under high humidity, slow drying
conditions, joints and wallboard
may hold moisture for weeks.
Improper wallboard application
including: nails dimpled too deep,
fractured core of wallboard,
fractured face paper, corner bead
applied improperly, tape photo-
graphing.
Entrapment of air in the mixed
compound and in application. Over-
mixing of compound. Compound
mixed too thin. Heavy fills.
Improper application technique.
Compound applied too loosely.
Preventive Action
Prime entire surface with a good
quality drywall primer. Follow
mixing instructions.
Use recommended water volume
when mixing texture and apply
at recommended coverage rates.
Prime surface with a good quality
drywall primer prior to application
of spray texture.
Prime surface with a good quality
drywall primer before applying
texture.
Use compound at heaviest
workable consistency. Allow to
stand before using. Allow thorough
drying of compound between
coats and prior to painting. Apply
additional coats on deep fills.
Provide proper drying.
Provide proper drying conditions.
Allow complete drying before each
coat of joint treatment and before
repainting.
Less dimple of nails. Press wallboard
snug to nailing member before
dimpling nail. Use Gold Bond
®
brand Gypsum Board. Re-nail
where necessary. Use Quick Set
compound for at least the first
coat on nails and corner bead.
(See Tape Photographing.)
Mix compound as quickly as
possible and let stand until binder
is in solution before remixing.
Mechanical mixers should have
500 RPM maximum. Use heavier
mix. Make additional passes
over joints and bead with hand
or mechanical tools. File trowel
edges square regularly to avoid
entrapment in application. Apply
compound thinly and use more
pressure on finish coat.
Corrective Action
Remove all texture from sprayed
surface and re-apply following
instructions under “Prevention.”
Allow spray to thoroughly dry, then
prime with a quality drywall primer
and re-spray or paint textured
surface.
Allow spray to thoroughly dry, then
paint textured surface.
Allow to thoroughly dry and
re-coat. Provide proper drying.
Allow to thoroughly dry and
re-coat affected joints.
Nails: re-nail where necessary.
Cut out any loose areas and fill
with two or more coats of Quick
Set or regular joint compound.
Re-coat corner bead.
Remove sanding dust that may
collect in “pocks” prior to painting
and refloat joint as necessary. When
condition exists after painting, float
with compound and repaint.