Table of Contents
Advertisement
Installing the non-penetrating mount on corrugated
metal roofs
This section explains how to install the standard nonpenetrating
roof mount on a corrugated metal roof. The key to a secure
corrugated metal roof installation is proper installation of cedar or
redwood lumber beams in the corrugated roof troughs. The
non-penetrating mount is attached to the beams.
Do not use pressure-treated lumber. These cause metal roofs to
corrode.
Special requirements:
– Redwood or cedar beams, as specified in step 1 below
– Twelve 2-inch-long (2.5-centimeter) lag bolts
1. Obtain five redwood or cedar beams. The beams' height is
dependent on the height of the corrugated roof trough ridges
and the height of the roofing material when compressed.
Beams must keep the mount above the corrugated roof ridges.
See Figure 5.
The beams' width must be such that water can flow down the
trough after the beam is placed. See Figure 5.
The length of the beams depends on the size of the
non-penetrating mount. Wood beam length must be 6 feet for
a 4 x 4 mount, and 8 feet for a 6.5 x 6.5 foot mount.
4-inch by 4-inch beams often meet the above requirements.
However, before installing any beams, ensure that they meet
the above requirements.
Chapter 4 • Installing mounts
1035678-0001 DRAFT Revision 1.04
33
Advertisement
Table of Contents
