Exposed Surface / Exposure - Anodize

Linetec defines an exposed surface/exposure as: 

• The surface area indicated on a material shape that requires finish coverage, paint or anodize
  • Typically a surface area, which when assembled into  doors, windows, or other assemblies, is either viewable, or is in direct contact to environmental weathering.

Significance of exposed surface/exposure indications:

• When Linetec anodizes material, accurate exposed surfaces must be supplied for the following reasons:

o        Whenever possible, material is clamped, racked, or welded on surfaces that are not exposed.

o        Material is racked at an angle that helps prevent gas-out onto exposed surfaces.

Square Footage

Square footage is calculated based on a shapes total exterior* perimeter

• Square footage is determined using a shapes exterior perimeter, when available

• Square footage is used to determine the time required in the anodize tanks to achieve a specific color

  • Inaccurate square footage can cause partial or complete job discoloration, which would require another production run and could decrease overall material thickness

* see information below on hollow material

Calculation of Exposure

Anodized exposure, per lineal foot, is calculated using the total exterior perimeter of the shape.

For non-extruded shapes, all exterior surface dimensions are manually summed to determine an approximate exterior perimeter. To minimize additions, dimensions for 1 side of the shape can be summed, and the sum multiplied by 2 for the complete exterior total  

• Exposure = exterior perimeter inch sum / 12
• Exposure calculations are subject to established minimums

Calculation of Square Footage (per piece)

Square footage is calculated by multiplying the exposure by the total lineal footage of the profile. 

·          Square footage = exposure X lineal foot length

HOLLOW MATERIAL

Exposure and square footage calculations are based on a shapes complete exterior surface.

• Interior of hollow surfaces are not included in the exposure / square footage calculated.
  • This is because the electrical current does not pass inside the hollow, so it is not calculated in the billed square footage.