T1-11 Siding: Specifications, Grades and How to Import from Brazil
T1-11 (also written T111 or Texture 1-11) is a grooved plywood siding panel that has been a staple of North American residential construction for decades. It is used on house exteriors, barns, sheds, garages, and outbuildings across the US and Canada. Brazil is one of the leading exporters of T1-11 to the US market.
What is T1-11?
T1-11 is a structural panel siding product — plywood with vertical grooves machined into the face at regular intervals. The grooves create a board-and-batten visual effect without the labour of installing individual boards. The panel is used as both structural sheathing and finished exterior cladding in one layer.
Key characteristics:
- Grooved face (vertical grooves only)
- Structural plywood panel — provides racking resistance
- WBP exterior phenolic glue bond
- Ready to prime and paint on installation
Specifications
| Specification | Standard value |
|---|---|
| Typical thickness | 9.5mm (3/8"), 11mm (7/16"), 15mm (19/32") |
| Sheet size | 1220×2440mm (4×8 ft) |
| Groove pattern | 4" o.c. (on centre) or 8" o.c. |
| Groove width | Approx. 3mm (1/8") |
| Groove depth | Approx. 6mm (1/4") |
| Species | Pinus elliottii / Pinus taeda |
| Glue bond | WBP Exterior Phenolic |
| Surface | Rough-sawn texture face (brushed or sanded options) |
| Grade standard | APA Rated Siding / PS1-09 |
Groove patterns
4" o.c.: Grooves every 4 inches across the panel width. Creates a narrower board appearance. Most popular for residential housing.
8" o.c.: Grooves every 8 inches. Creates a wider board appearance. Common for agricultural buildings and sheds.
CARB P2 and formaldehyde compliance
T1-11 exported to the US must comply with CARB P2 / TSCA Title VI formaldehyde emission standards. All T1-11 produced by our Brazilian mills for the US market is certified by an EPA-approved third-party certifier (Bureau Veritas, SGS, or Intertek).
Documentation provided:
- CARB P2 / TSCA Title VI compliance certificate
- Third-party emission test report
- Mill-specific CARB certificate
How to import T1-11 from Brazil
Lead time: 4–6 weeks production + 12–16 days transit to Gulf of Mexico ports (Houston, New Orleans).
Container loading: A standard 40'HC container holds approximately 800–1,000 sheets of 9.5mm T1-11 (4×8 ft), depending on stacking configuration.
MOQ: 1 FCL 40'HC. The 40'HC is the standard container for T1-11 due to panel size.
Pricing: FOB Paranaguá. Contact us for current pricing — rates vary with Brazilian exchange rate and production volume.
Documentation package
Every T1-11 shipment from EBP includes:
- Commercial invoice + packing list
- Bill of Lading
- Certificate of Origin (Brazil)
- Phytosanitary certificate (MAPA)
- ISPM 15 heat treatment certificate
- CARB P2 / TSCA Title VI compliance certificate
- FSC transaction certificate (if FSC grade ordered)
Related reading
T1-11 Plywood Grade Specifications · How to Source Pine Plywood from Brazil for the US Housing Market · CARB P2 Pine Plywood for US Importers · WBP vs MR Plywood · Pine Plywood
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