John Boos Kitchen Utensil CU SB2424 BN User Manual

1.2: Bolt clamp the joint. Do not use dowels. Fit bolt clamps (miter bolts) to  
the underside of all joints; 4” from the front, 6” from the back of miters and  
1-1/2” from both sides of butt joints. On wide joints fit an extra clamp midway  
between the others.  
Ventilation.  
Particle board or MDF tops fixed to cabinets should be removed or have large holes cut into  
them to assist with even and adequate ventilation. Do not attach directly on top of a solid  
underlayment. Butcher block needs adequate ventilation.  
1.3: Butt joints with opposing grain direction are never to be glued, instead use  
silicon.  
JOHN BOOS ULTRA-PREMIUM  
BUTCHER BLOCK COUNTER TOPS  
Installation Guide  
Brick walls.  
A moisture barrier, such as plastic, should be utilized in situations where “BUTCHER  
BLOCK” is located adjacent to brickwork or rendered walls to prevent moisture transference.  
A slight air gap should also be left.  
1.4: Miter joints and butt joints with grain running in the same direction  
should be glued.  
Correct installation of JOHN BOOS BUTCHER BLOCK COUNTER TOPS is vital for  
optimum performance.  
Overhangs.  
2.  
APRONS/DROP-FRONTS/FACIAS.  
If overhangs exceed eight inches (8”), then some form of bracketing should be used for support.  
Fitted to the front edges of bench tops. Must not be glued across the grain. If  
an apron is to run across the end of the bench top, it should be screwed with a  
fixing baton, allowing for movement, or “build up” the end grain by slicing off  
sections of the bench top end and gluing underneath.  
The moisture content of butcher block will vary due to the movement of moisture into and  
out of the wood. Natural humidity (dry and wet), air conditioning, machines that dispel heat  
or moisture (eg. Dishwashers, cooking appliances, etc.) will affect the moisture content of  
the wood. As moisture in the air increases it is absorbed by the butcher block, and the wood  
will expand. The butcher block contracts as moisture in the air decreases.  
SCREW HOLES  
Fixing through framework into the underside of  
bench should be via a 7/16” clearance hole and a  
#10 gauge screw with washer, allowing movement  
between fixing points. Holes should be predrilled.  
ONSITE STORAGE  
On receipt of your John Boos tops, it is essential that they are to be stored in a way that  
they are protected from the weather and areas that are subject to extreme changes in  
humidity. Store flat at least 8” off the floor to allow air to circulate. Do not leave boards  
leaning against brick or concrete walls as excess moisture pick up is inevitable.  
It is essential that BUTCHER BLOCK is fully envelope sealed as soon as possible with at  
least four coats.  
BUTCHER BLOCK, being a natural wood product, will expand and contract across the  
grain with these changes in humidity. This movement is quite normal. It is usually only  
minimal and can be allowed for in the installation (see Figure 3).  
NOTE: Ensure screw is centralized within  
clearance hole.  
SEALING  
Good sealing is essential to prevent an abrupt and excessive moisture movement to and  
from the wood. BUTCHER BLOCK must be envelope sealed, ie: top, bottom, edges and  
ends. Pay particular attention to the inside of cutouts, especially the end grain. If you cut  
on site – reseal the cut area with at least four (4) coats of sealer.  
“BUTCHER BLOCK” TOPS SHOULD NEVER BE GLUED DOWN.  
PROBLEM SOLVING  
End Splitting: is common with unsealed boards. Repair by filling with Epoxy glue.  
To ensure optimum performance, BUTCHER BLOCK requires protection from the  
environment by means of seal coatings. Sunlight breaks down most coatings, exposing the  
timber and allowing moisture, humidity and heat to act  
Minor Wood Defects: Natural to butcher block. Can be repaired with Wood Putty colored  
to suit.  
FIXING POSITIONS  
Minimal fixing only is required as the piece will be  
held down by self weight, plumbing, etc. Ideally,  
fix into the same strip of wood. Slotting or  
oversized holes will also help. The diagrams at  
right show examples of correct or incorrect fixing.  
3.  
GLUES  
STORAGE and HANDLING  
BUYER PROTECTION  
Use full strength Epoxy glues for like grain directions and Silicon sealant  
wherever there is opposing grains.  
Being a natural product, your tops are subject to changes in atmospheric conditions, and  
therefore require some care in handling and storage.  
4. HOLES/CUTOUTS.  
Must have a 3/16” clearance on all sides and corners should have a slight radius.  
The distance between the end of the bench top and a cutout or between cutouts  
should be at least 4-5”. If this is not possible, reinforce the narrow cross grain  
section by recessing and bluing a piece of similar John Boos butcher block into  
the underside with the grain running in the same direction and position it so that  
the glue lines are offset to the glue lines on the bench top.  
JOHN BOOS BUTCHER BLOCK COUNTER TOPS are warranted free from manufacturing  
defects, and the performance of the product is guaranteed, providing the conditions relating to  
handling and storage are adhered to and that fabrication and installation has been performed to  
John Boos recommendations.  
SERVICE CONDITIONS  
John Boos tops are suitable for interior use only.  
Natural wood features and variations in color and texture of the wood and/or laminates are not  
considered defects.  
A rubberized joint sealant should be used in all sink and basin applications.  
Holes must be properly sealed with at least four coats of polyurethane.  
Particular attention should be paid to the end grain.  
Dishwashers, floor mounted vents and hot water systems.  
Where appliances have heat acting on the bench top, polystyrene or similar insulation  
should be installed to cut down heat transference. Provide adequate ventilation.  
FABRICATION RECOMMENDATIONS  
5.  
6.  
PREPARATION  
Any grain checking, tear-out and similar butcher block blemishes should be  
filled and sanded (use a wood putty). Shakes, which have a tendency to lift,  
should be repaired with “5 minute" Epoxy colored to match the wood.  
1.  
CORNER JOINTS  
Sinks, cooktops, cutouts for posts, etc.  
All edges to be joined together must be dressed true (exact). The recommended  
corner joints are MITER joints or full BUTT joints. With miter joints on boards of  
unequal width, a true miter usually gives the best result as any movement is  
equalized, and the laminates will be close to matching at the joint.  
The fitting of sinks, basins, cooktops, etc. must not restrict the bench top from expanding  
and contracting. Ensure that there is at least one quarter inch (1/4”) clearance all around the  
appliance. Insulation should be installed around cooktops. Rubberized joint sealant should  
be used in sink and basin applications.  
SANDING.  
Sand the surface and seen edges through a suitable range of papers.  
1.1: Biscuit or tongue the joint. Joints should have “Lamella” biscuits or plywood  
slip tongues fitted.  
Vegetable storage.  
Where vegetables or other material that are likely to give off moisture are stored under the  
counter, insulation should be installed and adequate ventilation provided.  
 

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