EFCO S5500 Advanced User Manual

Page 30

EFCO CORPORATION 6/2012 PART NO. Y557

Series 5500 Advanced & Alternate Installation Instructions

Section V: Vertical Splice Joints

STEP #6 SEAL MULLION SPLICE

A. Install backer rod to back-up the sealant at the mullion joints as shown on page 24.

B. Apply sealant into the mullion splice joint and tool the joint. Do not obstruct the

glazing reglets.

C. Apply sealant into the pressure cover splice joint and tool the joint. Do not obstruct

the glazing reglets.

D. Apply sealant around the 1/4” x 1” x 5” long foam caulk joint backer. Tool the joint

and blend the sealant into the mullion splice joint and over the thermal struts. A

minimum of 1/4” sealant surface contact with bonding surfaces is required.

E. Apply sealant into the joint between the notched thermal struts and the back of the

notched pressure cover and tool the joint smooth (see page 31.)

A. Install backer rod at the

mullion joint to back-up

the sealant.

B. Apply sealant into

the mullion joint and

tool smooth.

C. Apply sealant into

the pressure cover joint

and tool smooth.

E. Apply sealant into the

joint between the notched

thermal struts and the
back of the notched

pressure cover, and tool

the joint smooth.

(See page 31.)

D. Apply sealant

around the 1/4” x 1”

x 5” foam caulk joint

backer, tool smooth.

Note: Gasket and adapter

reglets on both sides of the

glazing pocket must be free of
sealant obstructions before

placing gaskets and adapters.