house. Upon further investigation, it seemed to go down pretty deep and run under the driveway. I know it is unscientific, but he stomped on the driveway to show me that it sounded hollow for about a 2 - 3 foot radius from the edge of the driveway where the hole starts, seemingly indicating the ground is gone underneath. The mother in me instantly got visions of my son driving up his side of the driveway and his car disappearing into a sinkhole before he makes it into the garage! My question is ... how serious is this (this is all I know right now) and how quickly should I have someone look at it? Is it ok to wait until the Spring? Who should look at it? A concrete specialist?

A couple of things to point ou; it is near the run off from my gutter, although the water runs along the concrete, not the ground. And I have sinkholes all over my backyard - so do my neighbors - haven't heard of anyone having a sinkhole problem in the front yards though.

bathroom before they remodeled in the 50's. We had it refinished and it's very exciting to see it in the bathroom now:)

Pavers are actually quite easy to install and really only require one tool to be rented, a plate compactor. The heavy work is in excavating the area to about 6 and 1/2 inches below grade and moving the dirt. Then you build up the base with crusherun/crush&run which is a crushed stone. Build it up in 2 layers running the compactor over the area. A homeowner can use a 4 foot level and a 2x4 board to help get the crushed stone base to a proper pitch and close to even. Remember that the base should extend about 6" beyond the last paver.

The exact level surface is then done using 3/4" iron pipes. You will need at least 2 pipes. Lay the pipes across the base and check with a level to see if you have the proper grade. Use a little sand to adjust the pipes. With the pipes set, you begin shoveling the sand into the area and with a straight board, you screed (drag) the sand. You are left with a perfectly level surface of sand. As you move along, remove the pipes and fill the gaps with sand. Remember to not walk on the sand once it is screeded.

For a larger patio, we usually work in sections laying pavers as we go so that we can then work off of the already laid pavers. The chosen pattern will dictate any cutting. For a few cuts, a grinding wheel on a circular saw will suffice. For lots of cuts or cutting curves on a patio, a large gas powered cut-off saw with a grinding wheel or diamond wheel is necessary. We also use a large sliding table tile saw to custom cut some pavers.

Once the pavers are all laid, install the edging strips. Then, run the compactor over the pavers to bed the pavers in the sand. You will have a perfectly level and smooth paver patio/walk. It does not require setting each paver individually. While compacting, you will sweep regular sand or polymeric sand into the joints. If polymeric sand, follow the manufacturer instructions on sweeping, compacting, and wetting.

See the following photos for the process. As an example of how fast pavers can be installed, 3 of us installed the paver walkway seen in the photos in one day. We followed the same path of an existing paver walkway that was improperly installed. The one day included all excavation and all installation and clean-up.