The document provides installation guidelines for VB Products vapor retarder membranes in 3 steps: 1) Preparing surfaces by unrolling the membrane over aggregate or earth bases and joining seams. 2) Unrolling and overlapping the membrane with 6 inches of coverage on all sides. 3) Sealing any penetrations by cutting membrane pieces, wrapping them around pipes and posts, and taping seams.

1. VB Products
Installation Guidelines

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IntePlus® xf film
VB Products Installation Guidelines
Step 1A: Ground Surface Preparation : Earth Base
Barrier-Bac should be unrolled to completely cover the pour area. Seams
and/or joints can be joined using either BB20T Seam Tape or with heat
welding. The film should be overlapped six inches side-to-side and end-
to-end.
Steel (mesh, grid, or rod) reinforcement
Construction / Isolation joint
Concrete floor slab
Barrier-Bac Seam Tape at
membrane joints
Barrier-Bac Vapor
Retarder Membrane
Coarse compacted
earth base
VB Installation Guidelines 1

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IntePlus® xf film
VB Products Installation Guidelines
Step 1B: Ground Surface Preparation : Aggregate Base
Select the suitable Barrier-Bac product (VB-250, 11 mil or VB-350, 16
mil) and ensure the installation surface is relatively smooth. Although
Barrier-Bac products are extremely tough, installation is easier and more
effective when done over a smooth base. It is optional to have a layer of
granular fill under the Barrier-Bac.
Concrete Slab
Barrier-Bac Seam Tape
Barrier-Bac Vapor
Retarder Membrane
Select granular fill
(optional)
Coarse compacted
earth base
VB Installation Guidelines 2

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VB Products Installation Guidelines
Step 2: Unroll and overlap
Barrier-Bac should be unrolled to completely cover the pour area. Seams
and/or joints can be joined using either BB20T Seam Tape or with
heat welding. The film should be overlapped six inches side-to-side and
end-to-end.
Barrier-Bac Vapor
Retarder Membrane
Barrier-Bac Seam Tape
Barrier-Bac Vapor
Retarder Membrane
4”
2” 2”
Coarse compacted
earth base 6”
VB Installation Guidelines 3

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VB Products Installation Guidelines
Step 3: On Top of the Footing
When vertical wall is involved, please place the membrane butt end
on top of the footing and up against the vertical wall. This placement
method will provide the needed protection from outside moisture fol-
lowing construction completion.
Mastic
Grade
Barrier-Bac
Seam Tape
Barrier-Bac Vapor
Retarder and
Protection Sheet
Poured Concrete Wall
Waterproofing
Membrane
Aggregate Concrete Slab
Drainage system
Barrier-Bac
Vapor Retarder
Footing
Waterstops
Subgrade
VB Installation Guidelines 4

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VB Products Installation Guidelines
Step 4A: Seal Penetrations - Round Penetrations
All penetrations must be sealed with the Barrier-Bac and BB20T Seam
Tape. For round pipe or posts, please seal penetrations with Pipe Boot.
Measure a piece of Barrier-Bac
18˝ – 1 – Vapor Retarder membrane 18 inch-
es in width and twice (two times)
the circumference of the pipe.
2 times pipe
circumference
Roll the measured piece of mem-
– 2 – brane in a roll form approximately
the size of pipe.
Flatten sized roll and make vertical
cuts to approximately one-third of
⅓ of width
– 3 – the width and two inches apart.
2˝
Open boot and wrap snugly around
pipe, spreading cuts around base so
– 4 – strips lay horizontal to base.
Tape Tape around pipe circumference at
top of boot, down side seam of boot
and all two inch horizontal strips.
Cover all seams of membrane with
seaming tape.
VB Installation Guidelines 5

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VB Products Installation Guidelines
Step 4B: Seal Penetrations - Square Penetrations
All penetrations must be sealed with the Barrier-Bac and BB20T Seam
Tape.For square posts, please seal penetrations with Block Out Seam-
ing Methods.
Cut corners approximately half Cut a piece of Barrier-Bac Vapor
the height of Block Out Retarder Membrane twice the
height and one and one-half the
-1- length of the perimeter of the Block
Out. Wrap membrane around Block
Out and temporarily tape vertical
seam.
Vertical seam tape Block Out
Make cuts in each of the four cor-
-2- ners approximately half the height
of the Block Out. Remove formed
Block Out membrane form, flip over
and replace on Block Out spreading
flaps to horizontal position.
Tape all flaps securely with Barrier-
Bac Seam Tape.
Tape
VB Installation Guidelines 6

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VB Products Installation Guidelines
Step 5: Patch Damages and Pour Concrete
All damages to the film must be sealed prior to pouring. Patch all dam-
aged areas with Barrier-Bac and Seam Tape prior to concrete pouring.
Concrete may be poured directly onto Barrier-Bac VB-250 (11 mil) and
VB-350(16 mil). However, a sand or gravel cover is preferred. It is used
at the discretion of the architect or in compliance with local building
and regulatory codes.
Membrane Patch
8˝
-1- Cut a piece of Barrier-Bac Vapor
Retarder in a square large enough
so sides of patch extend eight inches
from side of puncture.
8˝
Puncture in membrane
Membrane Patch
-2-
Cover damaged portion with mem-
brane patch and secure all patch
seams with Barrier-Bac Seam
Tape.
Seaming Tape
VB Installation Guidelines 7

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IntePlus® xf film
VB Products Installation Guidelines
Other Drawings: Barrier-Bac Vapor Retarder under concrete slab to
footing with pipe penetration detail
Steel (mesh, grid, or rod) reinforcement
Construction / Isolation joint
Concrete floor slab
Barrier-Bac Vapor
Retarder Membrane
Barrier-Bac Vapor
Retarder Membrane
Barrier-Bac
Seam Tape
Coarse compacted
earth base
* See details at pipe penetration
VB Installation Guidelines 8

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IntePlus® xf film
VB Products Installation Guidelines
Other Drawings: Barrier-Bac crawl space detail
Termination Bar
Barrier-Bac Vapor Retarder
2˝ fillet urethane mastic
Subgrade (Earth Base)
Footing
VB Installation Guidelines 9