Installation Guide

ManualsBrandsGCP Applied Technologies ManualsBuilding materialsVycor Plus 9 in. x 33 ft. Roll Fully-Adhered Flashing

• ASTM E2112-01* and AAMA 2400-02* recom-

mend the use of a minimum 9 inch wide flashing

membrane beyond the rough opening.

• Grace recommends a 12 inch wide flashing mem-

brane for proper waterproofing of the window

sill, providing a drainage plane in the rough open-

ing.

• Remove any weather-resistive barrier from sill

area prior to membrane installation for full adhe-

sion of the membrane to the structural sill.

• Refer to “Table I – Flashing Lengths and Cut

Formulas,” (page 8), to determine appropriate

flashing lengths.

• After the membrane has been installed, roll firmly into place.

• Install membrane such that all laps shed water (following the

shingle principle). Always work from the low point to the high

point.

• Mechanically fasten the membrane at vertical terminations, as

necessary.

• Weather-resistive barrier refers to housewrap, building paper/

felt, Perm-A-Barrier

, etc.

• Windows/siding should be installed according to the standards

set by the window/siding manufacturers and/or respective

organizations.

• Apply Grace Vycor Self-Adhered Flashings only in fair weather

when the air, surface and membrane temperatures are at a

minimum of -4°C (25°F). For temperatures below 5°C (40°F),

keep material warm until use. (Refer to Technical Letter 3.)

• Install directly onto a clean, dry and frost-free surface.

Remove dust, dirt and debris. Surfaces shall be smooth and

continuous without voids, damaged or unsupported areas.

• Priming is generally not required for most substrates pro-

vided they are clean and dry. However, on concrete,

masonry and DensGlass Gold

, apply Perm-A-Barrier WB

Primer at a coverage rate of 6-8 m

/L (250-350 ft

/gal).

If adhesion is found to be marginal, also prime wood

composition and gypsum sheathing with Perm-A-Barrier

WB Primer at the same coverage rate.

Standard Practice for Installations of Exterior Windows,

Doors and Skylights.

Standard Practice for Installations of Windows with a

Mounting Flange in Stud Frame Construction.

How to Apply Grace Vycor Self-Adhered Flashing Tapes

PRE-INSTALLATION NOTES

Flashing Location Flashing Lengths and Cut Formulas

Sill Flashing Rough opening width + (2 x flashing width)

Jamb Flashing Rough opening height + (2 x flashing width) – 1 inch

Head Flashing Rough opening width + (2 x flashing width) + 2 inch

Example for 9 inch wide flashing

If rough opening width = 30 inches

If rough opening height = 50 inches

For Sill: 30 inches + (2 x 9 inches) = 48 inches

For Jamb: 50 inches + (2 x 9 inches) – 1 inch = 67 inches

For Head: 30 inches + (2 x 9 inches) + 2 inches = 50 inches

This table will assist in determining the pre-cut flashing

lengths required to properly install window flashing

(as per ASTM E2112-01).

TABLE I – Flashing Lengths

and Cut Formulas

Refer to our web sites for further product information.