|Cambridge Random Pattern
1 Pair Gloves & Safety
Carpenter’s chalk line
Stone cutter or masonry saw
8-10', straight 2"x4" yellow pine
(2) 8' lengths of 1 1/2" O.D. PVC pipe
Nylon mason string
- Sketch a diagram of the area to be paved.
- Square, rectangular, circular
and free-forming projects are all possible.
- To guide pavingstone lines,
it is best to square off a 90° corner.
If there is not an existing structure to measure off of, use a "3-4-5
triangle" method. Begin by measuring 3' along a straight reference.
Measure 4' from one end of the 3' line, drive a stake where 4' and 5'
marks meet. The angle opposite the 5' side will be 90°. Once this
corner is done extend the other sides using additional "3-4-5 triangles".
stakes, for outside perimeters, 6" away from area to be paved.
string lines to establish finished patio height and slope.
- Level the strings
around the project using a string line level.
Adjust sides for water
runoff by marking stakes below string line to allow for
a 1" drop every 8'. Re-adjust the string lines to follow slope
marks. The string line represents the surface of the completed
- Skim last 1/2" off with spade to leave soil undisturbed.
chart to determine depth and gravel/sand requirements:
- Fill in the excavated area with the quarry process gravel,
flattening, compacting and sloping. Use the 2x4 and cross string
lines as a guide to assure a perfect base installation. Proper compaction
and a smooth pitched surface base is vital.
- Install a
curb or edge restraint to prevent spreading of the pavers.
- To determine
where you want to install your edge restraint, lay a row of pavers
with manufactured edgers, when available, from one side
the area to be paved to the other. Position your curb so that you
maximize the use of whole pavers and minimize the number of stones
you need to
cut. Measure this distance and transfer the measurements to the curb
area. Position your Pave Edge restraint and nail it into the aggregate
STEP 5-PLACING (SCREEDING) YOUR SAND
- Add the coarse sand and smooth
it out (do not compact) using the PVC pipes as 1 1/2" guides
or rails and the 2x4 board. Do approximately 8' sections and be sure
lay pavers before preparing the next section of sand. Use a trowel
to fill in the gaps left behind by the pipes after you remove them.
walk on or disturb the freshly placed sand.
STEP 6-LAYING THE PAVERS
- Lay the pavers on top of the smooth sand, beginning at a right angle
or corner choosing "random placement" or "random running
bond". See pattern diagrams
and additional tips. For
best contrast, remove pavers horizontally from cube, layer by layer,
band by band. Work from up to 3 open cubes (project permitting) alternating
layers from each. If different blends are used in the installation,
substitute colors at random to create a desired balance of shades.
- Each Cambridge
paver is manufactured with a spacer bar to assure constant joint
widths, this allows the sand to fill the joints.
- Just hold a paver so the
bottom 1/4" to 1/2" clicks against
the top edge of the paver already in the sand. Release your grasp dropping
the paver directly downward.
- Use additional string lines to insure straight
- Check that the rows of pavers are straight every 3' by
running a string line along the front of the rows.
the pavers that will fit your area, you may need to cut some
- Use your stone cutter for simple cross cuts or a power driven
masonry saw for angled cuts.
STEP 8-COMPACTING THE PAVERS
compactor, make two passes over the installed pavers. This
will seat the pavers,
forcing sand up between the joint and completing the interlocking
effect of the Cambridge Pavingstone System.
SWEEPING AND COMPACTION
- Sweep more sand over the surface until all joints
are filled to the bottom of the chamfered edge.
- Compact again.
- Repeat process until joints are filled.