Finishing products – USG Manufactured Housing Handbook User Manual

Page 4

Joint Tape
Joint tape may be made of paper or
fiberglass mesh. Each type has its
place in manufactured housing.

Fiberglass Versus Paper Tape

Because of the nature of assembly-
line production, fiberglass mesh
tapes and setting-type compounds
have been developed for the manu-
factured housing industry. When
paper tape and a drying-type com-
pound are used for joint finishing,
the water in the compound tem-
porarily weakens the tape, creating a
joint that only achieves strength
after drying fully. If a finished section
is moved before the compound is
completely dry (as is likely to happen
on an assembly line), the possibility
of cracking is greatly increased.

For this reason, it is recommended
that fiberglass tape be used for fin-
ishing flats. (This tape is self-adhe-
sive, which will also simplify and
speed the finishing process.)

For areas such as corners and
wall/ceiling intersections, the use of
paper tape is recommended.

HEETROCK

MH Brand Joint Tape

-T

APE

௣)

is a fiberglass tape made with a
cross-fiber construction that resists
cracking, shrinking, tearing, stretch-
ing, and distortion. It is self-adhesive
for easy application. Designed for
use with S

HEETROCK

Setting-Type

Joint Compounds.

HEETROCK

௡ Brand Joint Tape

is a high strength paper tape which is
lightly precreased for corner applica-
tion and designed specifically for use
with S

HEETROCK

Setting- or Drying-

Type Joint Compounds to provide
optimum performance.

Joint Compounds
There are numerous joint com-
pounds available, each with its own
advantages and limitations. Many
different qualities, including ease of
sanding, resistance to humidity, ease
of mixing, and feathering properties
should be evaluated.

In general, however, joint compounds
can be categorized according to dry-
ing or setting type, and as powdered
or ready-mixed. Understanding these
major groupings will help you to
choose the best compound for the
finishing task at hand.

Drying Versus Setting

Drying-type compounds, which con-
tain water, must be allowed to dry
completely in order to ensure cre-
ation of a strong joint. The time
needed for thorough drying may not
be available in an assembly-line
environment. If finished sections are
moved before joints have dried com-
pletely, cracking may result. Drying-
type compounds are available in both
powder and ready-mixed forms. They
can only be used with paper tape.

Finishing Products

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Ready-mixed joint compounds are
convenient to use, because the mess
and mixing associated with powders
are eliminated.

Setting-type compounds harden
chemically for quicker finishing and
joint strength, and are available in a
variety of setting times. This makes
them especially suited to assembly-
line production. They can be used
with both paper and fiberglass joint
tape. Caution: Painting and textur-
ing are not recommended before
compound has set (hardened). For
best decorating results, once joint
compound has set, apply a prime
coat of S

HEETROCK

Brand First Coat

or an undiluted, good-quality interior
latex flat wall paint with a high solids
content. Allow prime coat to dry
before painting or texturing. Note:
Vapor retarder (VR) paints may be
used in place of the drywall primer.
However, experience has shown that
certain VR paint formulations inter-
fere with the setting action of joint
compounds. This will lead to low
strength, and can cause stress
cracking. Make sure the joint com-
pound is fully set before applying VR
paints.

HEETROCK

MH Brand Setting-Type

Joint Compound (T

-S

௣ High Early

Strength 15, 20, 30, 45)

is a specially formulated compound
that provides higher early strength
than standard setting compounds.
This high “green” strength offers
additional resistance to cracking
during the construction process.

HEETROCK

MH Brand Setting-Type

Joint Compound (T

-S

™

15, 20, 30,

45, 60, 90, and 210)

is a high-strength, chemically hard-
ening powder that sets quickly, pro-
vides strong bond with low shrink-
age, and ensures excellent
check-crack resistance. Available in
a variety of setting times.

HEETROCK

MH Brand Lightweight

Setting-Type Joint Compound
(T

-S

™

Lite 15, 20, 30, 45, 60, 90, and

210)

is an easy-sanding formulation that
is ideal for second coats (over T

APE

and T

-S

) or wherever sand-

ing is required. Available in a variety
of setting times.

HEETROCK

௡ Brand Lightweight Setting-

Type Joint Compound (E

ASY

AND

௣ 20,

45, or 90)

is an easy-mixing, smooth-applying,
quick-hardening, easy-sanding joint
compound with low shrinkage and
superior bonding. Ideal for patching
projects.

HEETROCK

௡ Brand All-Purpose Ready-

Mixed Joint Compound

is used for embedding paper tape,
for finishing coats, and for fill coats
over metal corner bead, trim, and
fasteners.

HEETROCK

௡ Brand Ready-Mixed

Lightweight All Purpose Joint
Compound (P

LUS

™

)

offers all the benefits of S

HEETROCK

Brand All-Purpose Ready-Mixed
Joint Compound with three exclusive
advantages: less weight, less shrink-
age, and easier sanding. Only two
coats required over metal corner
bead and trim; sands easily; bonds
well.

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