How much does fiberglass weigh per cubic foot?

Fiberglass reinforced plastic (FRP) weighs 112 lb/ft³ (1,800 kg/m³). This makes it about 77% lighter than steel while offering comparable strength.

Is fiberglass heavier than aluminum?

Yes, fiberglass (112 lb/ft³) is lighter than aluminum (169 lb/ft³). Fiberglass is about 34% lighter than aluminum by volume, making it popular for boat hulls and panels.

How much does a fiberglass boat hull weigh?

Fiberglass boat hull weight varies by size and layup thickness. A typical 17-foot fiberglass boat hull weighs 800-1,200 lbs . Hull thickness ranges from 3/16" to 1/2" depending on the area and structural requirements.

How much does a 4×8 fiberglass panel weigh?

A 4×8 foot FRP panel weighs approximately: 1/16" thick = 15 lbs , 1/8" thick = 30 lbs, 1/4" thick = 60 lbs. Use our fiberglass calculator for custom sizes.

What is the difference between fiberglass and FRP?

FRP (Fiber Reinforced Plastic) and fiberglass are often used interchangeably. FRP is the broader term for any plastic reinforced with fibers. Fiberglass specifically uses glass fibers. Both weigh approximately 112 lb/ft³ .

How does fiberglass weight compare to carbon fiber?

Carbon fiber is slightly lighter at about 99 lb/ft³ vs 112 lb/ft³ for fiberglass — about 12% lighter. However, carbon fiber costs 10-20× more, making fiberglass the preferred choice for most applications.

How much does fiberglass insulation weigh?

Fiberglass insulation (batts/rolls) is much lighter than solid FRP, weighing only 0.5-1.5 lb/ft³ . A standard R-19 fiberglass batt for a 2×6 wall weighs about 1 lb per linear foot. This is different from solid fiberglass panels at 112 lb/ft³.