Pre-Construction Termite Treatment in Media and Delaware County, PA

What a builder termite treatment is, and who needs one

A pre-treat applies a liquid termiticide to the prepared soil under a slab or basement floor, and later along the outside of the foundation after backfill. Together they form a treated zone that subterranean termites must cross to reach the framing.

Builders of new subdivisions, custom-home owners, and homeowners putting on an addition, sunroom or garage all run into the question. Your municipality's code office can tell you what termite protection it expects; the International Residential Code lists accepted approaches such as soil termiticide, baiting systems, and pressure-treated or naturally resistant wood.

The lot itself can raise the stakes. Land cleared from woods leaves buried stumps and roots that feed termite colonies, former farmland may hold old fence posts and outbuilding footings, and a nearby creek or high water table keeps the soil damp, all common conditions where new homes go up in the western and southern parts of Delaware County.

When should soil be treated on a new build?

Timing is everything. The horizontal treatment goes on after the soil under the slab is graded and compacted and the plumbing is roughed in, but before the vapor barrier and gravel go down and the concrete is poured. Treat too early and later grading moves the treated soil; treat too late and the slab is already in the way.

The vertical treatment along the outside of the foundation waits until backfill and final grade are done. Soil should be workable, not saturated: after a heavy southeastern PA downpour, the pre-treat may need to wait a day so it soaks in instead of running off.

Treatment options for new construction

Soil termiticide remains the common choice under slabs because it reaches soil that will never be accessible again. Bait systems suit sites near wells or streams, and they can be combined with a soil pre-treat. Not every option is offered for every project: call (209) 563-1650 to confirm what's available for your build before you lock in the pour date.

• Horizontal soil treatment under slabs, basement floors, porches and garage pads
• Vertical soil treatment along the inside and outside of foundation walls and around piers
• Extra attention at plumbing, conduit and utility penetrations through the slab
• Treatment of hollow block foundation voids before they're capped
• In-ground bait stations installed after landscaping as an alternative or addition
• Pressure-treated sill plates and termite-resistant framing chosen by the builder

Building codes, permits and Pennsylvania pesticide law on a new build

Two sets of rules meet on a construction site. The building side is local: Pennsylvania's Uniform Construction Code is enforced by your township or borough, or the third-party agency it uses, and that code office decides what termite protection it wants to see, often by pointing to the International Residential Code's accepted methods. Ask early whether the inspector wants a treatment record before signing off on the foundation.

The pesticide side is set by the state. The Pennsylvania Department of Agriculture (PDA) enforces the Pesticide Control Act of 1973, licensing pest control businesses and certifying the applicators who treat soil, and 7 Pa. Code § 128.31 requires the business license number on service vehicles. The label then sets the rate, the timing before the vapor barrier and the setbacks from wells and streams.

The pre-treat sequence on a slab or basement pour

1. 1

   Site visit

   Thom or one of his team reviews the plans, slab layout, porches and garage, plus any nearby well or stream.

2. 2

   Written quote

   The quote lists the areas to be treated at each stage of construction.

3. 3

   Scheduling with the builder

   Treatment is timed for after grading and rough plumbing and before the vapor barrier, usually within a day or two of the pour.

4. 4

   Horizontal treatment

   Prepared soil under the slab is treated at the label rate, with extra attention around penetrations and along footings.

5. 5

   Vertical treatment

   After backfill and final grading, soil along the outside of the foundation is treated.

6. 6

   Treatment record

   A record of the date, areas and product used is provided for the builder's or owner's files.

Do additions, sunrooms and porches need a pre-treat?

Usually, yes. An addition creates a new joint with the existing house, and that seam is a natural path for termites. If the original house was treated years ago, the addition's soil is untreated ground sitting against it. Treating the soil under the new slab and along the new footings ties the addition into protection on the rest of the house.

Older Delaware County homes getting a family-room addition or a rebuilt porch are a common case. If the existing house hasn't been checked in a while, the visit for the addition is a good time to look at its sills too.

What affects the cost of a new construction termite treatment?

The construction schedule is the biggest variable. A single basement pour with backfill a week later means two visits, while a Thornbury or Edgmont custom home with a basement, an attached garage pad, a covered porch and a later sunroom may need four or five separate trips timed to the builder's calendar.

Site conditions add to it. Lots near a stream or wetland, or on a private well, may need setbacks, a different technique near the water, or bait stations later, and a rainy spell that delays the pour can push treatment into a return visit. The written quote is laid out by construction stage, so the builder and owner see every trip and area before the first one is booked.

• Square footage of slab, basement floor, garage and porch pads
• Linear feet of foundation for the vertical treatment
• Number of separate trips the construction schedule requires
• Hollow block voids or complex footings
• Wells, streams or wetlands that limit soil treatment
• Whether bait stations are added after landscaping

After the pour: keeping the protection intact

Landscapers and later projects can undo a pre-treat. Keep mulch beds thin and away from the siding, don't let grade rise above the treated zone, and avoid stacking leftover lumber against the new foundation. Foam insulation that runs below grade deserves a yearly look because termites can tunnel inside it unseen.

Termites aren't the only wood pests on a building site. Framing left wet during a long build invites carpenter ant control calls later, and hardwood flooring that wasn't properly dried can bring in beetles that need powderpost beetle treatment. Where the soil wasn't treated before the pour, a liquid termite treatment can still be done afterward, with drilling.