FL42439 – National Nail Corp
Florida product approval FL42439-R1 for Roofing Products – Underlayments, as listed in ProdApproval’s data as of Sep 29, 2026.
- FL#
- FL42439-R1
- Manufacturer
- National Nail Corp
- Code version
- 2023 Florida Building Code
- Status in our data
- Approved
- Products
- 1
Official record on floridabuilding.org →Use on a spec sheet →
Verify approval status on floridabuilding.org before submitting.
Approved products under FL42439-R1
| Approval # | Model | Description | Design pressure | Wind-borne debris | HVHZ | Outside HVHZ |
|---|---|---|---|---|---|---|
| FL42439.1 | EXO25, EXO35, and EXO50 Synthetic Roofing Underlayment | Synthetic Roofing Underlayments - See CCRR for full product descriptions | N/A | N/A | Yes | Yes |
Fill a spec sheet with FL42439
On the contractor form, go to the Roofing Products – Underlayments row and type 42439 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.