Backer rod / exterior seal & exterior gasket, Detail #39, Step #41 – EFCO 955 Series User Manual

Page 32: Cut length formula for wnb9 = d.l.o. + 2

1/2"

(FS99)

ANCHOR

HORIZ. SILL

SILL

Detail #39

(FT01)

ANCHOR

VERT. SILL

STEP #41

SECTION VI - FRAME INSTALLATION

Install a continuous row of backer rod at the exterior side of the frame
and seal with silicone sealant. See the various details below.

3/4"

HEAD

(FS97)

HEAD ANCHOR

3/4"

1/2"

JAMB

SILL

CONT.

PAGE #30

JDA 9/2000

If the exterior glazing preset gasket (WNB9) has not been installed at this time,

STEP #42

BACKER ROD / EXTERIOR SEAL AND EXTERIOR GASKET

WNB9

CUT LENGTH FORMULA
FOR WNB9 = D.L.O. + 2%

at the gasket ends due to gasket shrinkage.

do so now. Be sure to add 2% of the cut length to the gasket to prevent gaps