Instructions / Assembly

4


Place rst ONDURA-9 sheet on roof. Align the ONDURA-9 sheet
to the rake edge. Align the eave edge of the ONDURA-9 sheet to
overhang the eave by 1 to 1-3/4 inches.

If more than one row of ONDURA-9 sheets is needed, then the
sheets must be installed along the eave rst. Then addional
rows are installed above the previous row.
Each row should be installed with the rst sheet at the opposite
end of the roof from the prevailing winds. With this orientaon,
the seam of the overlap will face away from the prevailing
winds. This orientaon will reduce the possibility of wind-driven
rain geng under the corrugaon overlap. If wind-driven rain
could come from both direcons, then we recommend sealing
along the overlap with an elastomeric caulk.
For aesthec reasons, we recommend staggering the posion of
the corrugaon overlap for each row by starng the second row
with a sheet that has fewer corrugaons. As a general guide, an
ONDURA-9 sheet with 4 or 5 corrugaons should be used for
the rst sheet on the second row. Then full-width sheets should
be used across the second row. If installing more than 2 rows,
the odd numbered rows should start with a full-width sheet and
the even numbered rows should start with a 4 or 5 corrugaon
sheet.
If possible, we recommend placing the rst row of ONDURA-9
sheets on the roof to conrm coverage with overlaps before the
installaon of the sheets.

ONDURA closure strips ll
the space created by the
corrugaons. Vented closure
strips are recommended
along the eaves and ridge of
the roof to enable airow
under the corrugaons. The
venlaon holes are small enough to prevent birds and insects
from forming nests under the corrugaons. Solid ONDURA
closure strips are available to completely block the openings
under the corrugaons.
Note: ONDURA closure strips t the ONDURA-9 sheets. We do
not oer a dierent set of closure strips for ONDURA-9 sheets.
Each closure strip is 44 inches long.
Drive each ONDURA nail only through the crown of a
corrugaon and perpendicular to the roof surface. Be careful
not to overdrive or underdrive the nail. The rubber washer on
the nail should be snugly in contact with the sheet. Slight hand
pressure on a nailed-down corrugaon should not separate the
sheet from washer contact.

Note: We recommend genuine
ONDURA nails for installing
ONDURA-9 sheets. Genuine
ONDURA nails are made from
galvanized steel, are ring
shanked, and have a large EPDM
rubber washer to improve
sealing around the nail. Other
types of nails may not provide
sucient hold-down strength.
1/16 inch
diameter head
1/8 inch thick x
5/8 inch O.D.
EPDM rubber
washer
.135 inch
diameter
ring shank
Correct Incorrect Incorrect

Place closure strips under the ONDURA-9 sheet with the curved
side up to ll the corrugaons. The closure strips must be placed
where the nails will be located so that the nails will securely
hold the closure strips in place during the life of the roof.