Installation Guide

5
FLOORS
Over Unheated Crawl Spaces, Garages, Overhangs and Cantilevers
Determine the maximum R-Value of insulation that can be installed by
measuring the depth of floor framing members. Select either R-38 (12"),
R-38HD (10¼), R-30 (10"), R-30 (9½"), R-30HD (8½") R-22 (6½"), R-19
(6¼"), or R-13 (3½"). Determine the width of the insulation you’ll need by
measuring the typical distance between floor joists.
• Fit EcoBatt kraft-faced batts between floor framing joists with the facing
toward the warm-in-winter side. Support with wire insulation supports,
criss-crossed rust-proof wire, or chicken wire.
• Position insulation to protect water lines and HVAC duct systems keeping
them between the insulation and the conditioned portion of the home.
• When installing unfaced EcoBatt over unconditioned, vented crawl
spaces, install batts that are properly sized for friction fit between joist
spacing and type of joist, i.e., manufactured joists, dimensional lumber.
Secure Knauf Insulation EcoBatt with plastic or other twine that is rot
and rust resistant and not susceptible to moisture damage. Underfloor
insulation support systems shall be installed so the insulation remains in
full contact with the sub-floor, flat and in place for the life of the residence.
Supports may be installed using wood lath, twine, wire, or other suitable
material. Insulation supports shall be installed with spacing no more than
24" on center and fastened using a pneumatic stapler. Foundation vents
shall be placed so the top of the vent is below the lower surface of the
floor insulation. When foundation vents are not placed where the top of
the vent is below the lower surface of the floor insulation, a permanently
attached baffle shall be installed at an angle of 30° from horizontal to
divert air flow below the lower surface of the floor insulation.
• In crawl spaces, cover the ground with a 6 mil polyethylene film to serve
as a barrier to ground moisture. Provide adequate ventilation to the
outside.
UNVENTED CRAWL SPACE
• Friction fit slightly oversized sections of EcoBatt batts in each joist and
over sill plates.
• Crawl space wall insulation shall be permanently fastened to the interior
of the foundation wall. Insulation shall extend downward from the
Rim/Band Joist and continue over the top of the foundation wall to the
finished grade of the crawl space and extend horizontally out from the
foundation wall for no less than 24". Exposed earth in unvented crawl
space foundations shall be covered with a Class I vapor retarder. 6 mil
polyethylene is an acceptable material. All joints of the vapor retarder
shall overlap by six inches and be sealed or taped. The edges of the
vapor retarder shall extend not less than six inches up the foundation wall
behind the insulation. Wall insulation shall cover the vapor retarder on
the foundation wall with the bottom edge of the insulation taped to the
vapor barrier. Insulation shall be placed over the vapor barrier ground
cover and taped or sealed at the edges. Secure the insulation by driving
galvanized nails and washers through the insulation into the sill plate.
You can also nail wood lathes into the sill plate every 18", compressing
the insulation between the lathe and sill plate.
• Be sure to cover the ground with 6 mil polyethylene film to serve as a
barrier to ground moisture.
EcoBatt Insulation Installation Guide
Mud Sill
Install kraft-faced EcoBatt after airseal
Sill Seal
Rim/Band Joist
Floor Joist
Apply sealant
along sill seal
Foundation
Seal perimeter
of rim/band
at each joist bay
Subfloor
Wall Framing
Vent Closure
Mud Sill
Sill Seal
Permanent
Baffle
Crawl Space
Wall
6 mil black
poly
EcoBatt Insulation must be
in full contact with subfloor
Insulation
Subfloor
Floor joist
Foundation wall
Twine
24" maximum
Subfloor
EcoBatt Insulation at
Rim/Band Joist
EcoBatt Insulation
wrapping over crawl
space wall
6 mil poly vapor
barrier extended
up foundation
wall minimum 6".
Fasten to wall
Extend EcoBatt
minimum 24" over
6 mil poly and tape
to poly
24"
Sill Seal