Common build schedule for surfboard

High performance: (2x) 4oz on top and (1x) 4oz bottom

Use this construction on a high-performance shortboard, fish, and small twin.

Strength and durability: (1x) 4oz + (1x) 6oz on top and (1x) 6oz bottom

Use this construction on long fish, midlength or longboard.

E-glass

Also known as electrical glass—is the standard glass composition used for most glass fibers. It is made from the oxides of silicon, aluminum, calcium, magnesium, and boron. It exhibits the following mechanical properties:

Density: 2.54 g/cm³ (158.6 lb/ft³)
Tensile strength: 3,400 MPa (490 ksi)
Modulus of elasticity: 72 GPa (10,440 ksi)
Percent elongation: 4.7

S-glass

Is a high performance glass fiber, distinguished from E-glass primarily by its higher silica content. S-glass typically contains the oxides of silicon, aluminum, and magnesium with the following mechanical properties:

Density: 2.53 g/cm³ (157.9 lb/ft³)
Tensile strength: 4,600 MPa (670 ksi)
Modulus of elasticity: 89 GPa (12,910 ksi)
Percent elongation: 5.2

Fiberglass (JPS Composite)