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PET Core Structural Fiberglass Panels Boat Stringer Grid (Price P.S.F) - $9 (Greenacres,WA)
condition:
new
make / manufacturer:
Custom
model name / number:
PET80 HVY DTY
size / dimensions:
3 1/8" x 85 1/2" x 88 3/4"
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Ultimate Material for Marine & DIY Builds:
These panels are heavily over-engineered. They can be used as complete high-strength panels or easily ripped down into custom, heavy-duty deep stringers and floor grid structural networks for reinforcing fiberglass boat hulls. They are also ideal for structural crash bulkheads, transoms, or building high-end custom truck campers, tiny homes, ice shanties, overland builds and many other applications.
These are priced at $8.75 per square foot, with exact individual prices listed below.
The Elite Core: Armacell ArmaPET Struct GR80
Unlike standard panels that use cheap EPS, XPS, PIR or PU, these are built with an Armacell ArmaPET Struct GR80 core (8 lb/cu ft density). PET (Polyethylene Terephthalate) is the next-generation premium alternative to traditional marine cores (like Coosa or PVC) for several key reasons:
• Superior Fatigue & Vibration Resistance: It handles severe hull flexing, pounding waves, and heavy structural engine loads far better than traditional marine cores without degrading.
• Zero Water Absorption: 100% closed-cell foam. Unlike wood or cheap foam, these will never absorb water, rot, or delaminate—even if your bilge fills up.
• Thermal Stability: It can handle high-heat curing and extreme environments without expanding, contracting, or off-gassing, keeping your lamination perfectly intact.
The Structural Advantage:
• Self-Supporting Framing: These panels act as both the walls and the frame. They are structurally strong enough to be completely self-supporting, meaning you do not need to build underlying wood studs or a steel frame structure.
• Zero Thermal Bridging: Continuous, hyper-efficient insulation across the entire surface with no framing cutting through.
Specifications:
• Heavy-Duty Fiberglass Faces: Thick structural fiberglass skins on both sides weigh 1.52 lbs/sq ft alone, offering incredible puncture resistance.
• Total Weight: All-up panel weight is a solid 3.51 lbs per square foot.
• Ready to Finish: Both sides feature a smooth, glossy white finish (marine UV-resistant gel coat).
• Great Insulation: 3-1/8" total thickness provides an excellent R-13 insulation rating.
• Available Inventory & Pricing: (Selling individually)
• Qty 2: 3-1/8" x 47-7/8" x 88-3/4" — 29.5 sq ft — ~104 lbs each — $258.12 each
• Qty 3: 3-1/8" x 48" x 94-3/4" — 31.6 sq ft — ~111 lbs each — $276.50 each
• Qty 1: 3-1/8" x 85-1/2" x 88-3/4" — 52.7 sq ft — ~185 lbs — $461.12
• Qty 3: 3-1/8" x 88-3/4" x 96" — 59.2 sq ft — ~208 lbs each — $518.00 each
• Qty 3: 3-1/8" x 94-3/4" x 96" — 63.2 sq ft — ~222 lbs each — $553.00 each
Terms & Pickup:
• Price: $8.75 / sq ft (Prices per panel are firm as listed above).
• Payment: CASH ONLY.
• Pickup: Must be picked up at my residence in Spokane Valley / Greenacres (Zip Code 99016).
No shipping or delivery available.
Please call should you have questions or to arrange purchase.