Installation Guide

Surface Preparation
• For best results, all surfaces must be
clean down to the original substrate and
free of any material or contaminant that
may prevent adequate adhesion.
• Air, caulk and surface temperatures must
be above zero degrees (0˚F).
• When installing fiber cement siding, refer
to manufacturer’s recommendations for
gap filling, to allow for expansion and
contraction. (figure A)
Cartridge Preparation
1. Cut sealant tip to proper size and angle
1/4” to 3/8” opening at approximately a
22.5 degree angle. (figure B)
2. Puncture inner seal with a clean object.
3. Place cartridge in cartridge gun.
Product Application
1. To ensure neat sealant lines use masking
tape adjacent to joints. (figure C)
2. If joint depth exceeds 5/16”, use backing
material.
3. Apply sealant into clean joint allowing for
a 1/4” to 3/8” rounded bead. (figure D)
4. Always apply sealant in a bead form.
DO NOT smear or wipe sealant to a thin
consistency outside of joint or masked
area. (figure E)
5. Once sealant is applied, DO NOT wipe
over sealant bead with solvents.
6. Once product is dry to the touch and
does not transfer, remove masking tape.
(figure F)
Clean-Up
• Clean tools with isopropyl alcohol before
sealant dries, following solvent vendor’s
precautions.
• Once cured, sealant must be cut or
scraped away.
figure D
WEATHERMASTER SEALANT
Fiber Cement Board Installation Guide
figure F
figure B
figure C
figure E
figure A