Five Questions Every Insurance Tower Should Answer

A tower can contain every intended layer and represent the program's vertical structure accurately while still leaving a risk professional unable to answer the questions that come up in practice. A more useful test is whether that view lets a risk team answer the questions that recur across renewals, program reviews, and carrier discussions.

An effective insurance tower answers decision-relevant questions about attachment points, limits, carriers, participation, and premiums across the program, which reframes the tower as a decision framework rather than a static drawing.

Question 1: Where Does Each Layer Attach?

Attachment points mark where one layer ends and responsibility shifts to the next, defining the vertical position of every layer in the tower. That positioning is foundational to reading the tower correctly, since nothing else about a layer means much until its place in the sequence is clear.

An attachment point reviewed on its own is just a number. The same figure becomes far more useful once it sits alongside its layer, limit, and carrier, since that context is what lets a risk professional reason about the program rather than memorize a threshold. This view matters most when:

• Reviewing program construction before renewal

• Explaining the tower internally

• Comparing the structure of different parts of the program

Question 2: How Much Limit Is Available at Each Layer?

A limit by itself answers a narrow question. Its usefulness grows once its relationship to the attachment point, the layer, and the surrounding coverage becomes visible, since a limit only means something in relation to what sits above and below it.

Limits and attachment points together are what let a risk team understand how the tower is assembled, layer by layer, from the primary position up through the highest excess. IRMI describes this construction as layering, building a program of coverage through the excess of loss approach, with each insurer writing coverage above the limits written by the insurers below it. Whether the limits themselves are appropriate is a separate question the tower does not answer on its own, since the tower's job is simply to make that layered structure legible.

Question 3: Which Carriers Participate Across the Tower?

The basic relationship among carrier, layer, limit, and attachment point is where carrier visibility starts. A risk team should be able to see, at minimum, who sits at each position in the program.

The same carrier often shows up in more than one part of a tower, and that repetition creates a relationship worth evaluating at the program level rather than the layer level. Repeated participation is simply a pattern that deserves visibility, letting the risk team decide what it means for their own program, and it shifts the useful question from who is on this layer to where and how a given carrier participates across the program.

LineSlip's Program Schematic surfaces that cross-layer view directly, extracting, classifying, and surfacing carrier participation through an aggregation bar that ranks each carrier by total exposure across every layer, so the pattern is visible without manually scanning the tower line by line.

Question 4: How Is Premium Distributed Across the Program?

Premium shown on its own, disconnected from the layer, carrier, and limit it supports, offers a fairly limited view. The number becomes more useful once it sits next to the coverage it is buying.

A tower that connects premium to program structure lets a risk team consider premium by layer, premium by carrier, premium relative to the limit it supports, and, where historical information is available, how that distribution has shifted over time. The tower puts pricing where a risk professional can reason about it, without determining on its own whether that pricing is appropriate or competitive.

Seeing premium in context can point a risk professional toward areas worth a closer look, without claiming the visualization itself performs the underlying pricing or coverage analysis. The tower raises the right questions. Answering them still depends on insurance judgment.

Question 5: What Happens When a Loss Moves Through the Tower?

A given loss amount implicates different layers depending on where it falls relative to each attachment point and limit. Understanding that relationship conceptually is a matter of visualization and program understanding, not claims adjustment or coverage determination.

Seeing which portions of the tower may respond to a loss is far easier when attachment points, limits, layers, and participating carriers are all visible at once rather than reconstructed separately. LineSlip's Loss Penetration Simulation lets a risk team model how a loss of a given size would move through the tower and see which layers respond, making carrier exposure visible before an event occurs rather than after.

That kind of visibility is useful well beyond a single what-if question. It supports program reviews, renewal strategy discussions, internal explanations of tower structure, and a clearer picture of carrier participation at different loss levels.

The Five Questions Work Together

The value of this framework comes from seeing how the answers intersect across the program.

1. Where does each layer attach?

2. How much limit is available at each layer?

3. Which carriers participate across the tower?

4. How is premium distributed across the program?

5. What happens when a loss moves through the tower?

A carrier participates within a layer. That layer begins at an attachment point. It provides a defined limit. The participation carries a premium. And the structure determines how different portions of the tower may become relevant at different loss levels. A useful insurance tower should let a risk team see those relationships together rather than treating each as a separate field to look up individually.

How Much Can You See from Your Current Tower?

Take the Insurance Tower Visibility Check to evaluate how clearly your current approach surfaces key relationships across your insurance program.