Preva Installation/Service Manual, 00-02-1577, Revision E01
3
When using lag screws as the method of attachment, it is imperative to consider
the full scope of the task. Several factors must be considered for safe, permanent
installations. Some of the key issues:
• Lumber commonly used in construction projects can vary among
locations.
• The grade, age, position, and overall condition can vary greatly.
• The attachment stud may have additional, hidden loads.
• The location of the pilot hole with respect to the center of the stud will
affect the load-bearing ability.
• The size of the pilot hole required for the lag screw depend on the grade,
age and condition of the lumber.
• Consider lumber dryness or moistness when attaching to exterior framing
studs.
• Midmark mechanical designs will exert up to 127 kg-m (920 lb-ft) of
loading moment on the supporting structure.
• Midmark provides fasteners for typical installations. Based on specific
conditions, it may be necessary to choose alternate fasteners or fastening
methods.
• If the surface of the Installation Guide falls below the surface of the wall, a
correspondingly longer fastener must be used.
• Seek the advice of a professional structural engineer to clarify any issues
before the installation.
• Inspect the attachment method 30 days after the installation and, every 6
months thereafter.
• Lag screws are not intended to be used as an attachment method for
metal supports such as those found in center island pass-through
cabinets. Midmark provides machine screws, large flat washers and
nylock nuts to use when fastening the system to metal supports.
Do not over-tighten the lag screw as this will weaken
the mechanical connection.
• Do not use lumber with splits or cracks for
attachments.
• Do not use lumber with splits or cracks for
attachments.
• Do not use plywood, particle board, or similar
construction materials.
• If the surface of the Installation Guide falls below the
surface of the wall, a correspondingly longer fastener
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