Installation Guide

ManualsBrandsProForm ManualsDrywall Joint CompoundJT3290

Installation Guide

Environmental Conditions

Varying weather conditions can

impact both the quality and

appearance of taped drywall joints.

Relative humidity, plus temperature,

will affect the working character-

istics of all joint compounds.

The potential for finishing and

decorating problems are minimized

when temperature, humidity and

airflow remain constant and as

close to occupancy environmental

conditions as possible. A minimum

temperature of 50˚F (10˚C) should

be maintained continuously for

48 hours prior to and throughout

the finishing process until applied

materials are thoroughly dry.

For example, cool wet weather will

slow down the drying process while

hot, dry weather hastens the drying

process. Exposure to winds, breezes

or drafts while drying can also affect

the performance of joint compounds.

Typical problems from improper

drying can be cracking, excessive

shrinkage, ridging and beading,

banding or bond failure. A further

explanation of these conditions

is outlined in the “Problems and

Solutions” section of this guide.

Proper precautions at the job site

should always be taken to mini-

mize the adverse effects of weather

on drying. These precautions will

ultimately reduce the application

time and expense from call backs

and rework.

Storage

Shelf-life up to 9 months under

good storage conditions. See

production date code. To prevent

spoilage and freezing, maintain

temperature at a minimum 50˚F (10˚C)

and protect container from exposure

to extreme heat and sunlight.

Frozen Ready Mix. Allow material

to thaw at room temperature for at

least 24 hours. When thawed, turn

the container upside-down for at

least 15 minutes. Turn pail right

side up, remove lid and immediately

remix with an electric drill. Ready

Mix should be lump free and ready

to use within 1 minute. Discard all

Ready Mix that does not remix to a

lump-free consistency.

Stacking

Ready Mix pails or cartons should

not be stacked more than two pallets

in height.

Mold And Mildew Growth

ProForm

brand XP

Ready Mix

with Dust-Tech

ProForm brand XP

Ready Mix with

Dust-Tech

was designed to pro-

vide extra protection against mold

and mildew compared to standard

ready mix compound. When tested

by an independent lab per ASTM D

3273 (“Standard Test Method for

Resistance to Growth of Mold on

the Surface of Interior Coatings

in an Environmental Chamber”),

XP Ready Mix with Dust-Tech

achieved a score of 10, the best

possible score for this test.

ProForm XP with Dust-Tech also

resists the growth of mold per

ASTM G 21 (Standard Practice

for Determining Resistance of

Synthetic Polymeric Materials to

Fungi) with a score of 0, the best

possible score.

When tested in a system with

ProForm

brand Paper Joint Tape,

Gold Bond

brand XP

Gypsum

Board or Gold Bond

brand eXP

Interior Extreme

Gypsum Panels,

the XP

system achieves a score

of “10” for ASTM D 3273 and a

score of “0” for ASTM G 21. These

are the best possible mold-resistant

scores for these tests.

Planning And Prevention:

Mold And Mildew Resistance

Planning and prevention is the

most effective way to avert

the growth of mold or mildew.

Gypsum wallboard and finishing

products should be delivered to

projects as near to the time it will

be used as possible. Wallboard

delivered to a job site must be

placed under cover immediately,

properly protected and not

exposed to outside elements such

as rain, snow or other high mois-

ture conditions.

If building materials get wet

from any moisture source, that

source must first be identified

and corrected. If mold or mildew

growth occurs, or if you suspect it

might occur due to environmental

conditions and moisture, a

determination must be made to

either attempt to dry and clean

the affected areas or to replace

the affected materials. Care must

be taken in this evaluation, and

if you do not have the training or

experience to recognize and to

make proper decisions about repair

or removal, you should consult a

professional.

No material can be considered

“mold proof,” nor is it certain that

any material will resist mold or

mildew indefinitely. When used in

conjunction with good design, han-

dling and construction practices,

XP Ready Mix with Dust-Tech can

provide increased mold resistance

versus standard ready-mixed

compounds. As with any building

material, avoiding water exposure

during handling, storage and

installation and after installation is

complete is the best way to avoid

the formation of mold or mildew.

Note: To ensure best results, only National Gypsum products should

be used together in construction systems. Mixing with other brands

is not recommended.

All National Gypsum joint compounds are formulated without asbestos

and therefore comply with Consumer Product Safety Standards.

Relative Temperature

Humidity 32° 40° 50° 60° 70° 80° 100°

0% 38/H 28/H 19/H 13/H 9/H 6/H 3/H

20% 2/D 34/H 23/H 16/H 11/H 8/H 4/H

40% 2.5/D 44/H 29/H 20/H 14/H 10/H 5/H

50% 3/D 2/D 36/H 24/H 17/H 12/H 6/H

60% 3.5/D 2.5/D 42/H 29/H 20/H 13.5/H 8/H

70% 4.5/D 3.5/D 2.25/D 38/H 26/H 19.5/H 10/H

80% 7/D 4.5/D 3.25/D 2.25/D 38/H 27/H 14/H

90% 13/D 9/D 6/D 4.5/D 3/D 49/H 26/H

98% 53/D 37/D 26/D 18/D 12/D 9/D 5/D

Note: D = Days (24 hour period) H = Hours

The chart above is a helpful guide in determining approximate drying times for joint

compounds under a variety of humidity/temperature conditions. Shaded area is below the

minimum application temperature requirement of 50°F and is not recommended for the

application of joint compound.

Joint Compound Drying Times

Approximate Drying Times: All Purpose/Lite Ready Mix Joint Compound

Ready Mix Compounds