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Situations requiring center correction
1. Sistered rafters
Where two rafters are sistered (fastened together side-to-side), the RE1 will
cause the compass to locate the center location between the two rafters. Since
this position is a void, it is NOT desirable as an attachment point. Therefore, the
person marking on the roof must be instructed to locate the center of the pre-
ferred rafter. In the case of two sistered rafters, each measuring 1-1/2” thick,
the center of either rafter would be ¾” away from the midpoint indicated. For
three sistered rafters, if the center position is void or not preferred for attach-
ment, the location would be displaced by 1-1/2” to an outer member.
2. Slanted rafters
When locating a rafter that is warped and off-plumb by no more than 10° at the
target location, rotate the magnet blocks to the slots-up position (Fig. 3). Clamp
them to the rafter as usual. Due to the rafter’s tilt, only one corner of each
magnet block should touch the bottom of the roof deck. The “center” position
identified by the Compass block on the roof deck will be suitable for a fastener
to enter perpendicular to the roof surface and remain in the center portion of
the top 2.5” of the rafter. If the fastener will enter significantly deeper into the
rafter, further displacement to compensate for the skew may be necessary.
3. Distorting fasteners
An off-center ferrous metal fastener in the deck and/or rafter directly within
the magnetic field may distort the field enough to give a slightly inaccurate
reading. (It will indicate a location deviated from center toward the fastener.) If
fastener locations are visible (from above the deck or below), avoid them. Usu-
ally the effect is negligible, but if necessary, either of two methods may be used
to correct fastener-caused distortion.
METHOD 1. LIFT COMPASS:
Start with
compass against roof and North-pointing needle end pointing straight down
perpendicular to roof surface. Gradually lift compass straight upward 1-2”
above the roof surface. If the needle moves left or right as the compass is
raised, relocate compass in mid-air until needle points straight down. This will
be closer to rafter center than the position indicated when the compass was on
the roof surface.
METHOD 2. RELOCATE MAGNET BLOCKS.
After marking a
center reading, move magnet blocks a few inches away along the length of the
rafter. If readings differ significantly, use a third nearby location or Method 1
to determine which reading is distorted.
Limited Warranty of RafterEye RE1
RafterEye LLC warrants the RE1 Rafter Center Locator against defects in
material and manufacture for one year from the date of purchase. Seller’s sole
obligation and your exclusive remedy under this Limited Warranty and, to the
extent permitted by law, any warranty or condition implied by law, shall be the
repair or replacement of parts, without charge, which are defective in material
or manufacture and which have not been misused, carelessly handled, or mis-
repaired by persons other than the Seller. To make a claim under this Limited
Warranty, you must return the complete tool, transportation prepaid, to:
RafterEye LLC
Customer Service
511 N Cuesta Ave
Tucson AZ 85745
IN NO EVENT SHALL SELLER BE LIABLE FOR ANY INCIDENTAL OR CONSEQUEN-
TIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LIABILITY FOR LOSS OF
PROFITS) ARISING FROM THE SALE OF THIS PRODUCT. This warranty may pro-
vide you with additional rights that vary by state, province or nation.
The Limited Warranty does not apply to depolarization of the Compass. Cor-
rection of this condition is explained in the User’s Guide and at RafterEye.com.
This Limited Warranty applies only to tools sold within the United States of
America, Canada and the Commonwealth of Puerto Rico.
RafterEye LLC RafterEye.com
511 N. Cuesta Ave, Tucson AZ 85745 [email protected] 520-261-2656
