Aurora Hot Tub Pads

Tell us where the spa is going and we can usually guess the decade the house was built. In the established parts of Sterling Hills and Murphy Creek, tubs end up on a corner of an existing patio or on a strip of side yard, because those backyards were laid out before anybody planned for one. Out in Southshore, Saddle Rock, and Tallyn's Reach the lot was graded with outdoor living in mind, and the real question becomes whether the pad lands on native ground or on fill the builder brought in.

Different yards, same slab underneath. A full spa presses hundreds of gallons plus a cabinet plus the people in it through a few square feet, and it holds that load permanently. Nothing else on your property works that way. A car rolls across a driveway and spreads out. A tub leans on the same dirt for fifteen years.

Older backyards, newer backyards, one load

Retrofits into an existing patio are the common call from the earlier neighborhoods. We saw out a clean section, dig to firm material, and pour a thicker pad joined to the old concrete so the two can move independently. First we check what that slab actually is, because plenty of thirty-year-old patios are three inches over dirt with nothing to build against.

On the newer side the problem flips. Concrete is fine, dirt is the unknown. Graded lots often carry feet of imported fill on the downhill half and undisturbed ground on the uphill half, and a pad straddling that boundary is the arrangement that cracks. So we dig and look, and where the pad crosses a seam we run steel straight through and build base in compacted lifts on both sides.

Access shapes the day either way. A wide side yard means a buggy and a two-hour pour. A narrow gate means wheelbarrows and a longer morning, and we'd rather say so up front.

Four places people put a spa, and what each one asks for

Water leaving, snow arriving

The slab has to shed water away from the cabinet, and that's easy to get backwards. Splash-out, rain, and snowmelt all land around a tub, and if the pad is dead flat with a wall on one side, that water sits under the skirt and freezes. We build a slight fall away from the equipment side and shape the grade so runoff has an exit.

Conduit goes in before concrete. Spas run a dedicated circuit to a disconnect, and that wire has to travel from the house somehow. We sleeve it under the pad, stub it where the electrician asks, and cap it so nothing packs with mud. Ten minutes on form day saves somebody sawing a channel through a three-week-old slab.

Pour season runs April into October, and late September may be the best date of all for a spa pad: cool nights, no rush, a slab fully cured before the first cold-evening soak. Winter pours work on something this small with heated water, a non-chloride accelerator, and blankets. Frozen subgrade is the hard stop.

Every spa pad we get called back to fix went low at one corner, and every one of those was poured on ground nobody dug into. You cannot see engineered fill from the surface. You find it with a shovel, which takes twenty minutes, or you find it three winters later, which takes a crane.From the crew lead on these jobs

What goes into every spa pad on our schedule

• Dimensions taken off the actual spa model, plus room at the equipment door
• Excavation down to firm material, then road base compacted in lifts
• Steel tied and chaired so the bar sits inside the slab rather than under it
• A capped sleeve run for the disconnect wiring before concrete shows up
• Air-entrained exterior mix rated for freeze and thaw at this elevation
• Both diagonals laser checked while the surface is still workable
• Broom texture for wet feet, edges tooled, control joints sawed that afternoon
• Surrounding dirt shaped so melt runs off instead of collecting under the cabinet