String Lines, Grading, and Why Your Paver Job Starts Before the First Paver

People drive by a paver job and they see the pavers. That''s it. They see the color, the pattern, maybe the border. What they don''t see is the work that happened before any of those pavers came off the pallet, and honestly, that''s the part that decides whether your driveway, walkway, or patio is going to look right ten years from now.

So let''s talk about what''s actually going on in this video.

The string line is the finished height

That string line you see stretched across the job, that''s not decoration. The string line represents the top of the paver. Not the top of the sand, not the top of the base. The top of the finished paver, exactly where you''ll walk or drive.

Once we know where the top of the paver needs to land, we work backwards. The sand has to sit at the right elevation so that when the crew lays the pavers and runs the compactor over them, everything settles down to that string line. If the sand''s too high, the pavers sit proud and you''ve got a trip hazard. Too low, you get a dip that holds water. Get the string line right and the rest of the job has a target to hit.

This is one of those things that looks simple from the outside and is actually where experience shows up. Anybody can stack pavers. Setting grade so the finished surface flows correctly, drains the right direction, and ties cleanly into the house, the garage, the steps, the existing concrete, that''s the craft.

When you have to build the grade up

On this particular job, up at the top there was a huge drop off. Big change in elevation between where the existing surface was and where the new paver surface needed to be. So we had to build that area up to the right level before we could even think about base and sand.

That means importing material, compacting it in lifts, and bringing the whole pad up to where the finished pavers will live. If you skip that step or rush it, if you just dump some base in and start laying pavers, that area is going to settle. Maybe not in the first year, but it''ll settle, and when it does, you get a low spot, water pools there, and the pavers around it start to shift.

Building grade up properly takes longer on day one. It saves you from a callback in year three.

Why we removed all the existing concrete

You''ll see in the video that we tore out everything, both the old concrete driveway and the old walkway. People sometimes ask if we can just lay pavers over existing concrete to save money. Short answer: usually no, not if you want it to last and look right.

A few reasons we pulled it all out on this one:

• Grade was wrong. The old concrete was set to old elevations. We needed a different finished height to make the new design flow right.
• You can''t fix what''s underneath if you don''t open it up. We don''t know what the soil looks like, what the compaction is, or whether something''s going to fail under there until we expose it.
• Transitions. Pavers laid on top of concrete create height issues at every doorway, threshold, and edge. It looks added-on instead of built-in.

When the old concrete comes out, we get to start with a clean canvas, set our own base, and build the whole thing to the right spec.

Steps up to the entrance, patio off to the side

Once the grade is right, the design starts to make sense. On this project the steps will run up to the entrance, and off to the side we''re building out a patio. That kind of layout, front entry, walkway, patio, all flowing together in the same material, is where pavers really shine compared to a flat slab of concrete. You get usable outdoor space and a real arrival experience instead of just a path to the door.

But none of that works if the base isn''t right. The string line, the grading, removing the old concrete, that''s what makes the finished product feel intentional instead of just installed.

What to ask your contractor

If you''re getting paver bids in Scottsdale or anywhere in the Valley, ask the contractor a few things before you sign:

• How are you setting grade? (Right answer involves string lines and a target elevation, not "we''ll figure it out as we go.")
• What''s happening with the existing concrete? (Removing it is usually the right move. Going over the top is rarely the right move.)
• What''s your base spec? (We use 4 inches of compacted ABC plus 1 inch of concrete sand. Anyone using quarter-minus or DG is cutting corners.)
• How are you handling the transitions to the house, garage, and any existing hardscape?

If they can answer those without dancing around them, you''re probably in good hands. If they can''t, keep shopping.

The bottom line

The reason a paver driveway lasts 30 years isn''t the paver. It''s everything underneath the paver. String lines, grading, base, sand, edge restraints, that''s the job. The pretty part on top is the easy part.

If you''ve got a project you''re thinking about, take a look at our estimating tool, put in your square footage and project type, and we''ll get you a proposal. Or give us a call and we''ll come walk the property with you.