Third Coast provides products that comply to the strict insurance requirements in coastal areas where additional design features are needed in order to meet the insurance and city codes. Third Coast can provide drawings to your engineer certifying the doors windload specifications.
Buying Decision
Product
Product Specification
Features
Best
Operation
Sectional Door
Torsion spring (high cycle available)
Applications: Standard lift, high lift or full vertical lift, depending on head room
Door is balanced throughout the door travel; typically less than 30 pounds of force required throughout the door travel
Spring exposed
Rolling Door
Torsion spring (high cycle available)
Door curtain slides between heavy angle iron guides using end guide wear plates; curtain rolls into a "barrel" above door opening.
Door balance differs throughout the door travel.
Out of balance typically adjusted by operator mechanism (gearing changed for doors that are more out of balance)
Designed for not more than 25 pounds of force
Only small doors use manual push-up operation
Able to configure large "special" doors for special applications
Sheet Door
Torsion spring
Balance differs throughout the door travel
Out of balance typically adjusted by operator mechanism
Designed for not more than 25 pounds of force
Doors are lighter than the rolling doors, therefore a larger range available in manual push-up
Over 10' x 10' use chain hoist
Appearance
Sectional Door
Typically 24" high sections hinged together
Very flexible in material (steel and aluminum) and steel gauges
Colors: baked-on enamel or custom finish
Multiple exterior appearances (raised panel, flush sections, ribbed, full view glass), various window configurations
Various options of insulation type and values
Rolling Door
Typically 2-5/8" high slats hemmed together
Available in a variety of gauges and materials including aluminum and stainless steel
1 or 2 slat profiles; uniform curtain thickness
Foamed-in-place urethane insulation; R-values typically less than 8
Perforated slats allow for air flow while still providing security
Windows are riveted in place; typically 2" x 10"
Sheet Door
Typically 24" high sections hemmed together
Typically 26 gauge sheets; available in a variety of colors; best paint warranty in the industry (25-year)
Small windows
Foil covered "blanket" insulation available; R-value 3
Durability
Sectional Door
More components
Ball bearing rollers designed for size and weight of door
Torsion springs power unit open; easily lubricated
Lift cables designed for 7:1 safety factor
Rolling Door
Components comprise curtain, springs, guides and operator
Guides are heavy structural steel
Springs are enclosed in barrel and hood (not visible)
Curtain has continuous hinge (length of section); longer wear point
Sheet Door
Typically 24" high sections hemmed together; components similar to rolling door
Roll-formed guides
Enclosed barrel makes spring lubrication difficult
Cost of Maintenance
Sectional Door
More components
Rolling Door
Components comprise curtain, springs, guides and operator
Guides are heavy structural steel; typically no maintenance required
Springs are enclosed in barrel and hood (not visible) and difficult to change / maintain if one breaks
Notched guide enables change of slat; difficult to remove and replace damaged slats.
Sheet Door
Typically 24" high sections hemmed together; components similar to rolling door
Typically replace entire door sheet
Exchange entire barrel if spring is broken
Energy Efficiency
Sectional Door
Expanded polystyrene; CFC-free urethane
R-values up to 17.2
U-values enabling government energy tax credits
Vary by section thickness
Rolling Door
CFC-free urethane insulation or mineral wood insulation in fire doors
Foamed-in-place between inside and outside slat cover; no thermal break
R-value up to 8.1
Mineral wool R-value up to 3
Sheet Door
Loose-fitting foil covered "blanket" of mineral wood
Foil covered mineral wool "blanket" held in place by "stays"
Rolls onto curtain barrel; not protected from the environment on inside of door
Initial Cost
Sectional Door
Modest initial material cost; modest installation cost
Depending on size of door, installation time and cost slightly higher than rolling steel or sheet doors because of the number of components and varying applications
Rolling Door
Initial cost higher; installation time and expense depends on size of door
Different options determine initial cost of product; typically slightly higher than section and sheet doors
Depending on size of door, installation time and costs slightly higher than sheet doors; weight of the door necessitates heavier equipment
Sheet Door
Initial cost similar to sectional door; installation time and expertise required typically least in the industry
Different options determine initial cost of product; typically slightly less than sectional door
Depending on size of door, installation time and costs less than sectional doors.
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