---
title: the first layer is the ground
canonical_url: https://ensurance.app/guide/the-first-layer-is-the-ground
markdown_url: https://ensurance.app/guide/the-first-layer-is-the-ground.md
subtitle: "deductible, primary, excess, the reinsurance behind them, and the layer under all of them"
category: nature-finance
---

# the first layer is the ground

*deductible, primary, excess, the reinsurance behind them, and the layer under all of them*

Insurance layers are the order in which money is committed to a loss. The policyholder pays first, through the deductible or retention. The primary policy pays next, up to its limit. Excess and umbrella policies pay above that. Behind the insurer, a separate reinsurance contract protects it. Under all of them is one more layer: the condition of the place.

That bottom layer acts before anyone pays anything: the soil through a dry summer, the floodplain beside the street, the forest above the houses.

:::johnson
**the first layer is the ground** — every policy in the stack waits for a loss. The condition of the place shapes the loss before it exists, against several perils at once, and nobody in the stack pays for it.

[See what an insurer can fund →](/solutions/insurers?from=guide&topic=multi-peril)
:::

![photo by Aron Schmitz (@as95) on unsplash](https://images.unsplash.com/photo-1777460370311-79182c3b45bb?w=1200&fit=crop)

## the stack, from the policyholder's side

Most homeowners meet two layers; a farm or a business may carry more. From the bottom up:

| layer | who pays | what it does | when it responds |
|---|---|---|---|
| The condition of the place | No one in the stack | Sets how often and how hard a loss arrives: soil, floodplain, forest, grass | Before the event, every season |
| Deductible or retention | You | The first part of each covered loss | From the first dollar of a claim |
| Primary policy | Your insurer | Pays covered losses above the deductible, up to its limit | Once the deductible is met |
| Excess or umbrella | Another policy, often another insurer | Pays above the primary limit | Once the primary limit is used up |

**Deductible or retention.** A deductible is the part of a covered claim you carry. A business may instead hold a self-insured retention, paying its own losses until the policy attaches. Many property policies carry separate deductibles per peril, such as wind and hail, named storm or earthquake. Flood usually sits in a separate policy with its own deductible ([the perils your policy leaves out](/guide/the-perils-your-policy-leaves-out?from=guide)).

**Primary.** The policy that responds first after the deductible: homeowners, farmowners, commercial multiple-peril, federal crop. It is where a covered claim is paid first.

**Excess and umbrella.** Excess coverage adds limit above a primary policy, usually on its terms. Large commercial property programs stack excess layers from several insurers. An umbrella adds liability limit; a personal umbrella over home and auto does not pay to rebuild your own house.

**Reinsurance is not a layer you buy.** It is a separate contract between your insurer and its reinsurer. It sits behind whatever the insurer wrote, primary or excess, and you never claim against it. The treaty side is in [the loss moved down the tower](/guide/the-loss-moved-down-the-tower?from=guide). For you, loss an insurer keeps can show up in your terms.

## the layer under all of them

Every layer above is a promise to pay after. The bottom layer is a condition that works before.

**It acts first.** A deductible responds to a claim; the ground responds to the weather. By the time a claim is filed, the place has set part of its size.

**It acts on several perils at once.** Insurance is priced and limited peril by peril, through exclusions and separate deductibles. A place is not. The same soil that holds water through a drought takes in a downpour. Across 754 rain-fed US counties, each added percentage point of soil organic matter was associated with about 36% less of the insured liability paid out under severe drought (Kane et al., 2021). Across 12 Corn Belt states, a 1% rise in cover-crop adoption was tied to nearly $40 million less in prevented-planting indemnities, the wet-field loss (Won et al., 2023). No single study measures both from one practice, but they point at the same practice family. For the crop side, see [the soil under the crop policy](/guide/the-soil-under-the-crop-policy?from=guide).

**No one in the stack funds it.** The deductible is yours; the premium buys the layers above. Agencies, landowners and conservation groups do some of that work on their own budgets, and where they stop, the condition drifts.

The ground does not set every peril. Hail, straight-line wind, freeze and earthquake are weather or geology; the land sets little of them ([secondary perils are not secondary](/guide/secondary-perils-are-not-secondary?from=guide)).

| peril | what the ground layer works on | how much say it has (our reading) |
|---|---|---|
| Drought | Soil organic matter, water held in the root zone | Real: soil organic matter associated with lower drought losses in county data (Kane); smaller in clay soils |
| Excess moisture and flood | Infiltration, floodplain room, wetland storage | Real for wet fields (Won) and coastal marsh (Narayan); river floodplains some (mechanism) |
| Wildfire | Fuel load and forest structure | Strong in treated dry western forest while the treatment lasts (Davis) |
| Erosion and landslide | Roots, cover, slope condition | Real (mechanism); mostly outside the policy |
| Hail, wind, freeze, earthquake | Little | Weak. Weather and geology dominate |

## why the bottom keeps mattering

Homeowners insurance had its worst year since at least 2000 in 2023: a $15.2 billion underwriting loss and a combined ratio of 110.9 (AM Best, 2024). The combined ratio was 105.7 in 2024 (AM Best, 2025). By 2025 the pure net loss ratio had improved by 12.5 points, to 53.5% (NAIC, 2026). Results recover; the hazard under the book does not change at renewal.

A higher deductible is one lever a carrier or a buyer reaches for when a book loses money: it lowers the premium by moving the first part of each loss back onto the owner, the layer closest to the ground.

Much loss never enters a stack. Of about $220 billion in global economic natural catastrophe losses in 2025, about 49% was insured, a record share (Swiss Re, 2026). For the uninsured half, the owner's own savings and public aid carry the loss, and the condition of the place is the only thing that shaped it beforehand. Salt marshes in Ocean County, New Jersey, cut average annual flood losses by 16%, insured or not (Narayan et al., 2017).

## why the first funding belongs on the ground

A dollar of deductible pays part of one loss, from one peril, after it happens. A dollar of premium buys a promise against the perils the policy covers, after they happen. Money spent on the condition of the place can work before any of them, and on several perils at once. We know of no study that sets a dollar of condition against a dollar of premium.

We borrow the insurance word: the primary layer is the one that responds first. The ground is not a policy and pays nothing; it acts first, on several perils, before any layer of money. In a meta-analysis of 40 studies across 11 western states, thinning plus burning, or prescribed fire alone, cut later wildfire severity by 62 to 72% against untreated stands; the effect fell by more than half after 10 years (Davis et al., 2024). Condition works, and it wears off, so it has to be kept.

**Ensurance** is how that condition gets funded before the season: a **certificate** on a named place, held as a position rather than spent as a grant ([specific ensurance](/specific?from=guide)). It is the best way we know to fund the bottom layer, because it pays for the condition rather than the loss. It does not lower your premium today. Whether a funded place changes what an underwriter sees is a question for the record and the model ([does mitigation lower insurance premiums?](/guide/does-mitigation-lower-insurance-premiums?from=guide)).

## what the policy above still does

Fund the first layer; insure the rest. The policy does what the ground cannot.

- **It pays.** The policy writes the check that rebuilds the roof. Ensurance pays no claims and indemnifies no one.
- **It satisfies the lender.** A mortgage or an operating loan needs proof of insurance. A certificate is not that, and should not be.
- **It covers what the land does not set.** Hail, wind, freeze and earthquake stay in the policy, with their deductibles.
- **It carries the largest events.** A floodplain lowers a flood; it does not stop the biggest one. Excess limits, where a program has them, and the insurer's reinsurance exist for that.

Limits: [what ensurance cannot do](/guide/what-ensurance-cannot-do?from=guide); [ensurance vs insurance](/guide/ensurance-vs-insurance?from=guide). The ground shapes the loss; the policy pays for what still arrives. When the layers above leave a zone altogether, the risk stays with whoever remains ([when the insurer leaves, the risk stays](/guide/when-the-insurer-leaves-the-risk-stays?from=guide)).

## frequently asked questions

### what are the layers of insurance?

From the bottom: the deductible or retention you carry, the primary policy, excess or umbrella policies above it, and, behind the insurer, a separate reinsurance contract. Under all of them is the condition of the place, which shapes the loss before any layer responds and which no layer funds.

### what is the difference between a deductible and a self-insured retention?

With a deductible, the insurer handles the claim and pays it less the deductible. With a self-insured retention, the insured pays, and often handles, losses up to the retention before the policy attaches.

### is umbrella insurance the same as excess insurance?

Not quite. Excess adds limit on the primary policy's terms, over property or liability. An umbrella adds liability limit and can fill some gaps; it does not repair your own house.

## next steps

- **Writing policies.** The [insurers page](/solutions/insurers?from=guide&topic=multi-peril) names two ways a carrier can fund the ground under its book: a **flood buffer investment** in wetland condition upstream of exposed homes, and a **wildfire risk corridor** of fuel treatment where the book meets the forest. Modeling your book is yours.
- **Holding the land.** If you carry the deductible, you carry the bottom of the stack. [Landowners](/solutions/landowners?from=guide&topic=multi-peril) covers a full natural capital valuation and ecosystem income without selling.
- **The how-to.** [Fund the primary layer, insure the rest](/guide/fund-the-primary-layer-insure-the-rest?from=guide) walks through it. To talk, [write to us](/contact?from=guide&topic=multi-peril) and name the place.

## sources

AM Best, via Insurance Journal (2024) — homeowners 2023 underwriting loss of $15.2 billion, combined ratio 110.9, worst since at least 2000

AM Best, via Carrier Management (2025) — homeowners 2024 combined ratio 105.7

NAIC, *U.S. P&C and Title Industries – 2025 Full Year Results* (2026) — homeowners 2025 pure net loss ratio 53.5%, improved 12.5 points

Swiss Re Institute, sigma 1/2026 — 2025 global economic natural catastrophe losses of about $220 billion, about 49% insured

Kane et al., *Environmental Research Letters* 16:044018 (2021) — soil organic matter and drought-related crop insurance payouts across 754 US counties; county-level, correlational

Won, Rejesus, Goodwin and Aglasan, *American Journal of Agricultural Economics* (2023) — cover-crop adoption and prevented-planting indemnities in 12 Corn Belt states

Davis et al., *Forest Ecology and Management* 561:121885 (2024) — meta-analysis of fuel treatments and later wildfire severity

Narayan et al., *Scientific Reports* 7:9463 (2017) — salt marshes and average annual flood losses in Ocean County, New Jersey

---

## the series

1. [what multi-peril insurance covers, and what acts first](/guide/what-multi-peril-insurance-covers?from=guide) — **Read first:** the policy bundles the payouts; the land bundles the protection
2. [the soil under the crop policy](/guide/the-soil-under-the-crop-policy?from=guide) — Multi-peril crop insurance, and the ground that answers drought and downpour both
3. [the perils your policy leaves out](/guide/the-perils-your-policy-leaves-out?from=guide) — Named perils, open perils, and the exclusions the land works on
4. [one hillside, many perils](/guide/one-hillside-many-perils?from=guide) — Fire, then flood, then debris: hazards that arrive in a sequence the policy splits apart
5. [the first layer is the ground](/guide/the-first-layer-is-the-ground?from=guide) — Deductible, primary, excess, reinsurance, and the layer under all of them
6. [fund the primary layer, insure the rest](/guide/fund-the-primary-layer-insure-the-rest?from=guide) — How to pay for the condition that acts first, and keep the policy for what still arrives


**Companion series:** [risk has an address](/guide/risk-has-an-address?from=guide) — spatial risk: the pin, the footprint and the source, for an insurer's, a lender's or a town's whole book.