Installation Guide

installation instructions
Insulation
certainteed.com/membrain
Installation on walls
1. Start at a corner of the room where an interior partition wall or
door jamb meets an insulated exterior wall. Lay the MemBrain
roll on the floor, with the end touching the bottom of the
partition wall or jamb.
2. Unroll MemBrain along the insulated wall, until the next corner
is reached. Cut the film perpendicular to the insulated wall so
that overall length is 8"-12" longer than the wall.
3 . With the 3" offset edge parallel with the top of the insulated
wall, place one corner of the cut sheet at the top left or right
corner of the wall. The factory cut edge should be covering
the top edge of the top sill plate. The cut edge of the sheet
should wrap around the inside corner at least 4". Ensure that
the folded material is facing the room (the print across the top
header should be facing out). Anchor this corner with staples.
4. Working towards the opposite corner, pull the sheet tight,
and staple the offset edge to the top sill plate. Staples
should be at least 12"-24" apart.
5. After stapling to the
opposite corner, allow the
folded sheet to unfold
to the floor (see figure 1).
6. Pull the sheet downward
and staple to the bottom sill
plate. Then staple at 12"-24"
intervals along each stud.
Effort should be made to
minimize wrinkles along the
stud surfaces to make drywall installation easier.
7. With a razor knife, trim around outside edge of windows and
doors (sill plate, trimmers and headers) so that the MemBrain
material covers the entire framing. Staple to the framing at
6"-12" intervals around the perimeter of the window or door.
To trim around outlet boxes, cut to inside edge and stretch
around outside of box to form a seal (see figure 2).
8. Repair any cuts or tears more than 4" long using 2" wide
cellophane tape (Scotch 610 or equivalent).
9. Should you have to use more than one piece of MemBrain
per wall, make sure the pieces overlap by at least 3".
Installation on ceilings
1. Install as per the installation steps for walls, standing on one
side and carefully stapling across the room.
2. When installing the next piece, make sure the pieces overlap
by at least 3''.
Note: These instructions are for standard vapor retarder applications for wood studs only. For instructions
on installing MemBrain as a continuous interior air barrier system, please refer to “MemBrain Air Barrier
Installation” (document #30-28-137) available through your CertainTeed representative by calling
800-233-8990 or online at certainteed.com/membrain under the Installation tab.
© 08/14 CertainTeed Corporation, PO Box 860, Valley Forge, PA 19482
Printed in the U.S.A. • Code No. 30-28-157
MemBrain
™
Continuous Air Barrier and Smart
Vapor Retarder helps create a better performing
home when installed over CertainTeed unfaced
fiber glass insulation where vapor retarders are required.
Consult local building code requirements to determine if your
region requires vapor retarders. MemBrain should be installed
in all insulated walls and ceilings, including cathedral ceilings.
In most areas of the country, MemBrain should be installed on
the “warm in winter” side of the wall cavity. MemBrain is not
intended for use as an exterior vapor retarder.
Protect your home from damaging moisture with MemBrain
™
Continuous Air Barrier & Smart Vapor Retarder
Folded Film to
Unfold into
Room
Top Edge of Offset
Figure 1
MemBrain™
Sheeting
Window Rough Opening
Junction Box
Wood Stud
Electrical
Outlet
Figure 2