Installation Instructions
Application Instructions
Organic Felt rolls must be installed horizontally, from
the bottom of the roof deck.
The first layer of Felt rolls must be installed to cover
the entire bottom edge of the roof deck to facilitate the
water shedding ability of the Felt.
Anchor the top corner of the Felt roll after it has been
properly positioned in place; then spread the roll
across the roof. Care must be taken to roll out the
Felt smoothly and to avoid any wrinkles as the Felt is
unrolled across the roof.
Install fasteners at least eight inches at the top and
middle edges and at the eave along the deck.
At slopes between 2:12 and 4:12 pitch, install a
double layer of Felt as follows. Apply a minimum 19
inch wide strip of Felt parallel to and starting at the
eaves, fastened sufficiently to hold in place. Starting
at the eave, apply a full width Felt roll, overlapping
successive sheets 19 inches, fastened sufficiently to
hold in place.
At slopes 4:12 and greater, a single layer of Felt
rolls shall be installed parallel to and starting at the
eaves, over lapped at least two inches, and fastened
sufficiently to hold in place.
The second course of Felt should be aligned with the
roof edge and overlap the first course as described
above, according to the roofing slope. Fasten the Felt
to the deck and repeat the pattern.
Continue to install the next course of Felt from the
roof edge and overlap with the previous course as
described above, according to the roof slope. If a new
roll is required to complete the installation to the end
of the roof, overlap the new roll over the prior roll by
at least four inches. Use the same fastening pattern
for the top, the middle and the bottom of the roll for all
subsequent courses.
The top of each subsequent course should be
fastened intermittently to hold the edge in place until
the next course is applied. Make certain to secure the
fasteners at the bottom of the next course to hold the
top of the previous course.
Continue this pattern until the top of the roof. Fasten
the top course if it terminates at the top edge of the
roof. Otherwise, overlap the Felt over the ridge and
fasten it. Repeat the process from the bottom of the
other side of roof deck as described above, depending
on the slope of the roof.
In valleys, lay a vertical section of the Felt in the
middle, along the length of the valley prior to installing
a horizontal course of the Felt. If more than one
section of Felt is installed in the valley, start at the
bottom and overlap the top section by at least two
inches to ensure proper shedding of water.
Fasten the Felt in the valleys using the same pattern,
taking care to avoid wrinkles. If wrinkles are formed
while fastening the Felt, slice the wrinkles and
fasten them flat to the deck. Then seal the cuts with
waterproofing cement.
General Precautions
Asphalt Saturated Organic Felt rolls shall not be
installed when wet.
The roof deck must be clear of all debris and moisture
prior to installing the Felt.
Do not walk on the Felt before fastening it into proper
position on the roof deck.
Install the primary roof covering immediately after
installation of the Felt.
Organic Felts must be installed as per Tarco published
installation guidelines. Follow the National Roofing
Contractors Association (NRCA) roofing manual
and relevant application guidelines from the Asphalt
Roofing Manufacturers Association (ARMA).
Observe all Occupational Safety and Health
Administration (OSHA) safety requirements during
installation.
Local codes may supersede these instructions. Check
with the local building code administrator for specific
requirements.
Note
All statements, information and data given herein are believed to be accurate and reliable but are presented without guaranty, warranty or
responsibility of any kind, expressed or implied, except as may be indicated otherwise in this literature.