Cheap wood sleepers can damage your work and your reputation!
Loose laid wood block sleepers deteriorate as a result of freezing, thawing, UV exposures and bacterial attack. Metal brackets corrode and screws back out. Movement, dirt and disintegrating wood create "rot spots" and often lead to premature death for properly installed roof membranes.
Knuckleheads install quickly with tough M-1 Adhesive/Sealant.
Solid: Adhesive applied on bottom and base of Knuckleheads keeps water, ice and dirt from underriding support and attacking membrane. Bonded Knucklehead support systems minimize damage by wind, ice, flying debris, vandalism and seismic events. Alternatively, small membrane pads may be used at the base to disperse weight.
Durable: Impervious to water, biological attack and freeze-thaw conditions.
Versatile: The Knucklehead carries two 1/2in diameter pipes in its small channels, or a single 1in pipe in the large channel.
Knuckleheads have been redesigned to accommodate needed height changes. The new adjustable Knucklehead can be easily raised and lowered from 3-1/8in to 4-1/8in high usually eliminating the need for a riser.