Addendum O: Insulation Disclosure
Florida Addendum O documents the insulation installed—or planned for installation—in a new residence. It identifies where the insulation belongs, what material will be used, its thickness, its manufacturer, and its R-value.
What does Addendum O do?
Addendum O creates a written insulation schedule for a new home. It tells the buyer which areas will be insulated and records the type, thickness, manufacturer, and R-value of the insulation used in each listed area.
This rider is not intended for every resale
Addendum O is titled “Insulation Disclosure for New Residence.” Its purpose is to place specific insulation information into the contractual paperwork for a newly constructed home.
Newly completed homes
The residence may already be complete when the contract is signed, allowing the installed insulation information to be identified.
Homes under construction
The rider can disclose insulation that will be installed as the builder completes the home.
Pre-construction contracts
If exact insulation information is not yet known, federal rules address when the information must be supplied after it becomes available.
Not a resale inspection form
The rider does not require a seller of an ordinary existing home to open walls or independently determine hidden insulation.
It records insulation specifications. It does not independently give the buyer a right to perform destructive testing, demand upgrades, cancel the contract, or require the seller to improve existing insulation unless another contract provision creates that right.
Four pieces of information describe each installation
Type
The general insulation product or system, such as fiberglass, cellulose, spray foam, rigid foam, or another specified material.
Thickness
The installed or intended depth of the material. Thickness can affect performance, but thickness alone does not state the insulation’s full thermal resistance.
Manufacturer
The company responsible for the specified insulation product, helping connect the disclosure to product literature and installation requirements.
R-value
A measure of resistance to heat flow. R-value is tied to the specified material and installation—not merely a generic promise that the home will be energy efficient.
What does R-value mean?
Higher resistance does not tell the entire story
R-value measures how well an insulation material resists conductive heat flow. Generally, a higher R-value means greater resistance under the applicable test and installation conditions.
But the number cannot be evaluated in isolation. Performance can also be affected by installation quality, compression, gaps, air leakage, moisture, framing, windows, doors, ductwork, roof design, orientation, and the home’s mechanical systems.
The insulation schedule, translated
The form organizes the information by location so buyers can see that different parts of the home may use different products, thicknesses, and R-values.
The information may be unavailable, omitted, inapplicable, or covered elsewhere in the construction specifications. Buyers should ask for clarification instead of guessing what an empty field means.
Why insulation information belongs in a new-home contract
§460.16 Federal R-Value Rule
New-home sellers must disclose insulation specifications
Federal regulation generally requires a new-home seller to include the type, thickness, and R-value of the insulation that will be installed in each part of the house in every sales contract.
When a buyer signs before the seller knows the insulation details, or when the insulation plan changes, the federal rule provides a process for supplying the information once it becomes known. Addendum O offers a structured place to document the relevant information within the Florida transaction.
Read 16 CFR §460.16 →Builders may use Florida Realtors forms, proprietary builder contracts, construction specifications, addenda, product sheets, or other disclosures. Buyers should review how the required insulation information is incorporated into their particular agreement.
What Addendum O does not guarantee
Specific utility bills
Energy costs depend on rates, thermostat settings, occupancy, weather, appliances, pool equipment, home size, and many other factors.
Perfect installation
A written specification does not independently verify that every cavity was filled, the correct depth was achieved, or installation defects do not exist.
Whole-home efficiency
Insulation is only one component. Windows, doors, ducts, air sealing, HVAC equipment, orientation, and solar exposure also influence performance.
Soundproofing
Thermal insulation may influence sound transmission, but an R-value disclosure is not a promise of acoustic performance.
Code compliance by itself
The form records insulation information. Building officials, approved plans, inspections, and applicable codes determine compliance.
A cancellation right
Addendum O is not itself written as an inspection or energy-cost contingency. Any buyer remedy depends on the contract and facts.
Compare the promised specification with the construction record
Review the written specification
- Addendum O and the sales contract
- Approved construction plans
- Builder selection sheets
- Energy-code documentation
- Product literature and proposed substitutions
Preserve the installation record
- Photographs before drywall installation
- Insulation contractor invoices
- Product labels or certificates
- Inspection and permit records
- Written documentation of approved changes
Once wallboard and finishes are installed, many insulation areas are hidden. When permitted by the builder and construction schedule, photographs and appropriate inspections can help document what was visible before those assemblies were closed.
Florida Addendum O FAQ
Does Addendum O apply to every Florida home sale?
No. Addendum O is an insulation disclosure for a new residence. It is not designed as a general insulation inspection form for every existing-home resale.
What information does Addendum O disclose?
The rider identifies the insulation location, type, thickness, manufacturer, and R-value for listed portions of the new residence.
What does R-value measure?
R-value measures resistance to conductive heat flow. Generally, a higher R-value represents greater resistance under the applicable product and installation conditions.
Does a higher R-value guarantee lower utility bills?
No. Utility bills also depend on home size, climate, air leakage, windows, doors, ductwork, equipment efficiency, thermostat settings, occupancy, energy rates, and personal habits.
What if the insulation is not known when the contract is signed?
Federal rules provide a process for delivering the required insulation information once it becomes known when the contract was signed before the details were available or the insulation plan changes. Buyers should preserve the final written disclosure.
Can different parts of the home have different R-values?
Yes. Walls, flat ceilings, sloped ceilings, garage separation walls, and other assemblies may use different materials, thicknesses, and R-values.
Does the rider prove the insulation was installed correctly?
No. It records the insulation specification. Installation quality may require construction records, inspections, photographs, product documentation, and qualified professional evaluation.
Does Addendum O create a buyer cancellation right?
Addendum O is primarily a disclosure form, not an inspection or energy-performance contingency. Any cancellation or remedy must come from the applicable contract language, law, or other agreement.
Review the insulation-disclosure requirements
The details hidden behind the walls belong in writing.
DW&Co. helps Central Florida new-construction buyers compare builder promises, contract specifications, incentives, inspections, and the practical details that can affect the completed home.
Connect With DW&Co.This page is provided for general educational purposes and is not legal, engineering, energy-audit, building-code, inspection, or contracting advice. Products, construction methods, codes, federal rules, and contract forms may change. Buyers and sellers should review the documents used in their transaction and consult qualified professionals regarding the specific residence.