FL17840 – National Gypsum Company a dba of National Gypsum Services Company
Florida product approval FL17840-R4 for Roofing Products – Roofing Insulation, as listed in ProdApproval’s data as of Sep 29, 2026.
- FL#
- FL17840-R4
- Manufacturer
- National Gypsum Company a dba of National Gypsum Services Company
- Code version
- 2023 Florida Building Code
- Status in our data
- Approved
- Products
- 3
Official record on floridabuilding.org →Use on a spec sheet →
Verify approval status on floridabuilding.org before submitting.
Approved products under FL17840-R4
| Approval # | Model | Description | Design pressure | Wind-borne debris | HVHZ | Outside HVHZ |
|---|---|---|---|---|---|---|
| FL17840.1 | DEXcell Cement Roof Board | cementitious roof board with fiberglass mesh | N/A | N/A | Yes | Yes |
| FL17840.2 | DEXcell FA Glass Mat Roof Board | Glass mat faced gypsum roof board | N/A | N/A | Yes | Yes |
| FL17840.3 | DEXcell Glass Mat Roof Board | coated glass mat faced gypsum roof board | N/A | N/A | Yes | Yes |
Fill a spec sheet with FL17840
On the contractor form, go to the Roofing Products – Roofing Insulation row and type 17840 in the Florida Product Approval # box to fill the row. Walton County users can print a PDF that follows the county’s sheet; see the Walton County Product Approval Specification Sheet guide.