Technical Specifications

Warranty
Warranted to be free from manufacturer’s defects.
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.
 Observe all Occupational Safety and Health Administration (OSHA) safety requirements during installation.
 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).
 Local codes may supersede these instructions. Check with the local building code administrator for
specific requirements.
Application
 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.
Revised 1/2019 © 2019 Tarco All Rights Reserved. Printed in U.S.A.
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.