A Common Question Many Customers are Asking...

Schweiss Bifold and Hydraulic doors


"The choice is yours. Each door offers something different. Each has specific advantages. Tell us your situation
so we can better advise you. The bottom line, its the customers choice. Only Schweiss Doors gives you that
advantage. Schweiss Doors already has a long history in the door world. We are the first choice for thousands of
customers and our Hydraulic Doors are creating great interest. With either door, you get Schweiss Quality. Talk
with us first and we can make your decision easier... Hydraulic or Bifold!"

"You decide which door works for you."

Door Parking Comparison

Hydraulic or Bifold, Swings out or lifts up


The One-Piece® hydraulic door acts as a large moving wall that swings outward when opening, requiring extra
space as the door travels outward to the open position.


To avoid possible damage to equipment, vehicles and airplanes, clearly label the doorway or ramp area
"No Parking Area". By clearly marking the "No Parking Area" there will be minimal loss of valuable parking
space in front of your hangar/fly-in home/shop/warehouse/storage building.

caution moving door swings outward


At airports with hangars located on each side of the taxiway, keep the
door open or closed (not half open) to avoid damaging wings as planes
taxi by the front of your hangar door.


Schweiss recommends that all One-Piece® hydraulic doors have
windows in the door frames. Windows will make any obstructions
in front of the door visible to the operator before opening the door.


When operating the One-Piece® hydraulic door, you must clearly
warn people. The door swings outward when moving. No parking
in the doorway. Personal injury and property damage can result
from a moving door. WARNING: Schweiss does not recommend
using the space under the door as an extended work area or for
parking your expensive equipment or airplane. Your door is the
largest piece of moving equipment on your building and can be
dangerous. Keep the doorway clear.

no parking zone distance - bifold vs. hydraulic


Important to Install a window to view the
door travel area

Door swing outward when opening. The doors need extra room to travel when opening.

You must keep the doorway clear of people, vehicles and objects

Caution! No parking on the Ramp or Driveway!

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Parking in front of
your door video


Bifold doors have a huge advantage when opening. They start by raising upward, not out ward. They requiring less operating space in the front of your building. The area in front of your large door opening is very valuable space. The two piece bifold allows more usable space in front of your door opening. Bifold doors are a real space saver.


The fact that bifold doors fold in half instead of just swinging out, allows for more open ramp/ vehicle space in front of the hangar. It also allows the full use of the width of the hangar, making the entire end wall a door.



Grease Zerks On All Hinges . . . STANDARD ON EVERY DOOR!

Greasable Hinge Comparison

Customers Welcome Greasable Hinges!


Where you hang the door matters!

Hydraulic vs. Bifold Clear Opening - Where you hang the door matters

Less Headroom Required

A hydraulic door is ideal in situations where
maximum clear opening must be maintained.

The hydraulic door swings out and away from
the building

There is no loss of headroom.

There is no headroom lost inside the building.

Lose No Headroom

Bifolds doors mount up and above the clear opening on
the outside of the building structure.

The bifold doors lifts up and out from the building

No need to make the building taller

There is also no headroom lost inside the building.

Where you attach the door makes all the difference...

No need to make the building taller!

Door Slope Comparison

Hydraulic Doors

lie flat 90° when in the full open position.
Water and snow can build up when left fully open!

Caution: precipitation resting on fully opened door may cause damage to the fully opened door

Hydraulic Doors

lie flat 90° when in the full open position.
Water and snow can build up when left fully open!

When Open Lay Flat

The One-Piece® hydraulic door will be at
90° from the building when fully open.
External trusses are standard on hydraulic
doors. Optional Internal Trusses are available.

Slight Slope Recommended

One-Piece® doors should have a slight
downward slope when open to direct
moisture and water off the door sheeting.
This prevents moisture and water from
seeping under the door sheeting and ruining
the interior door insulation.

One easy way to get slope on your hydraulic doors is to open the door
to allow your vehicle/machinery in, then lower the door to create a slight
slope for moisture to run off.

CAUTION: Remember to open the door again when moving
your vehicle/machinery in or out of the building.

OR Order the Door with a built in slope !

Request a taller door frame that allows you to open your door to the full clearance while still
having a slight slope to the door in the full open position allowing proper drainage.

Bifold Doors have a natural slope



Bifold doors have a 1:12 natural slope
when in the open position.

The sheeting on bifold doors are flashed
to allow water to easily drain off the door.

Water and snow run off in any position!

Internal trusses are Standard.
No external truss required on bifolds

Door Travel Comparison

Why I went with a Hydraulic Door

I like the shade when open !

Swing out when opening

Door Travel Comparison-Swing out vs. Lift Up

Why I went with a Bifold Door

We needed all the parking space we could get

Lift up when opening

Why I went with a Hydraulic Door

I like the shade when open !

Swing out when opening


Hydraulic Doors swing outwards when opening.
Hydraulic doors require more/greater space in
front of the doorway for the door to travel outward.


The fact that bifold doors fold in half instead of
just swinging out, allows for more open ramp/
vehicle space in front of the hangar. It also allows
the full use of the width of the hangar, making
the entire end wall a door.

Safety . . . Hydraulic

Hydraulic Safety

hydraulic door - two lift points

Lift Points

Two lift points

Hydraulic Cylinder
on each end of the
door frame

Lift Mechanism

Two Large hydraulic
cylinders with
spherical bearings

Powerful Hydraulic
Power Unit

Cylinder diagram with callouts


Soft shift valves located
on the hydraulic pump
allow Schweiss Hydraulic
Doors to open and close
smoothly preventing any
jerky motion when
operating your hydraulic
door. Schweiss doors are built
with safety in mind!

Schweiss hydraulic doors have built in safety

Hydraulic pump picture

In the event of a hydraulic failure

Like a Hose breaking

Like a Hydraulic line breaking

Like a Fitting failure

Large hydraulic overhead doors must STOP ! ! !


If a hydraulic hose should ever break . . . Schweiss Doors includes velocity fuses that lock up the cylinders that STOPS The Door

Door WILL STOP immediately!



Not a Schweiss Door almost destroys plane

If there is a failure of a hydraulic component on a large overhead door, It needs to...

STOP immediately!

Restrictors / ORIFICE . . .

Have been used by some manufacturers as a safety feature

They may be setting you up for slow motion
disaster, Your worst nightmare!

There's nothing safe about a door slowly, gently
coming down on top of a plane or vehice at a
"controlled rate of speed."

Does your door use restrictors/orifice? Hope not.

Phrases like these are being used to describe the safety of a door.

Gently coming all the way down...

Coasting down...

Controlled rate of decent...

Preventing the door from slamming down...

If the door WON'T STOP it can be
your worst nightmare!
When Purchasing a door find out if your getting
restrictors /orifice . . .
Ask yourself . . . How safe can that be?


Ask your neighbors what they have?

Manufacturers that use Restrictors

decorative image

The Fact is . . . The Door Will Not STOP !

Cylinders that have . . .


No safety built in

Door will come all the way down if theres a failure, no matter what.

No way of stopping the door from coming all the way down

Slow motion disaster

Your worst nightmare

This is an unsafe design

Not A Schweiss Design

Safety . . . Bifold

Safety . . . Bifold - Multiple Lift Points



Wider the door the more lift straps that are used.

More lift points evenly distributes the weight of the door.

More lift points increases the doors safety factor.


Motor - GearBox - Electric Brake.

Jackshaft Assembly - Dual Chain & Sprockets.

Stresses on the Building Structure

Clear Opening Height - Hydraulic Vs. Bifold

Hydraulic doors and subframes attach to the
building structure and exert considerable
horizontal and vertical loads to it.
The building must be prepared to support the
forces of your door in all positions.

The longer or further a door frame sticks out
from the building at a 90°, the more torque and
stresses it adds to the building structure and

Hydraulic doors swing out when opening and
cantilever out from your building, pulling away
from the building structure at the hinge line and
exerting additional forces on building header.

Bifold doors fold in half when opening, putting less
stress on the building structure

Bifold doors fold in half when opening and create
a slight slope to allow water to run off.

Bifold door frames attach to the building structure,
exerting forces and vertical loads to the building

The building must be prepared to support the
forces of your bifold door in all positions.

A One-Piece® door hangs out twice as far from the building as a bifold

Wind Effects . . . On a Door in the Open Position

Clear Opening Height and how far door extends out

Is it safe to leave the door open in Windy Conditions?

Here are some facts to consider...

All doors attach to the building and exert forces onto your building structure.

A one piece hydraulic doors has more surface area protruding 90 degrees off the end of your
building structure

Adding windy conditions to a door in the full open position will cause it to act like an airplane wing
or a parachute, carrying the powerful wind forces back into the building structure.

No matter what size door you have, all the weight and forces are transferred back to your building.

Hydraulic doors are more susceptible to wind problems when open than a bifold door.

More surface area for the wind to catch.

SCHWEISS doors will hold up . . . but will your building?

Schweiss has recommended safe operating parameters.

Door Truss Comparison

External Truss Door -- Hydraulic

DOOR Truss's can be placed on the exterior of the door or on the interior . . . Customer's choice

External Truss - Standard

An external truss is located on the outside of the One-Piece® hydraulic door frame three inches off the
floor/ground level. The external truss is pre-built to provide added strength and rigidity. Very important in
high-wind conditions. Hydraulic doors are manufactured with a support truss to provide strength and proper
wind loading to the door. It also minimizes the door sagging in the open position.

EXTERNAL Trusses - DESIGN Options

Custom painted external truss - to match your building

Custom enclosed & flash the external truss give it a neat appearance.

Custom designed trusses to match the look of your building structure.

Raised external truss... keep people/equipment/snow away from bottom truss

NO Truss

"No Truss" on smaller size doors. The "No Truss" look gains valuable headroom and gives
you a clean look both outside and inside the door frame.

Internal Truss Door -- Bifold

Internal Truss - (Standard on Bifold Doors)

Bifold doors are manufactured with an internal truss for support to provide strength and proper wind loading
on the door. Bifold doors come standard with an interior truss that mounts to the inside of the door frame.

Nice clean look outside the door.

Located on the inside of the door frame.

Located out of the weather elements, protected.

No lost headroom.

Internal truss allows you to match your door covering to the building structure's.

It will appear as one continuous wall - with the look of your choice!

Benefits of an Internal Truss

Up and out of the way of people walking by or in the area.

Snow plows won't run into it.

Won't collect debris or snow.

Provides extra strength to the door frame.

Allows proper drainage of the door in the open position without a truss to get in the way.


Internal trusses are available on your hydraulic door, but you sacrifice headroom space!

Advantages of an interior steel truss is it will not be exposed to the weather elements.

No place for the leaves, debris or snow to collect or for the snowplow to hit!

When you go with an internal truss you lose headroom unless you mount your door higher.

AVAILABLE . . . External Truss for Bifold Doors

Located at the center of the door.

Will not collect snow when the door is in the opened or closed position.

When extra strength is needed, Schweiss also offers an external truss.

Hydraulic Door Frame

Hydraulic Door Frame

Hydraulic door comes pre-assembled, pre-welded and delivered pre-hung within their own subframe for easy
installation, giving the buyer or builder tremendous flexibility as well as saving time and money!

Door Frame

Double push tube door frame comes pre-assembled, pre-welded and pre-hung to its own subframe
header Tube.

Schweiss vertical door members are stronger and are spaced closer than other's for more strength.

Schweiss does not allow wood on any of it's door frames. Safer!

Schweiss One-Piece Hydraulic Doorframe

Hydraulic Door And Subframe Assembly

Attach to the Building Structure

Subframe Header Tube . . . Horizontal MEMBER

Provides added support for the door and the building structure.

Heavy-duty greasable hinges are pre-located, pre-welded and pre-hung to the subframe header tube.

Mounts to the building structure with heavy-duty mounting brackets and bolts for easy installation.

Subframe Side Columns Legs . . . Vertical MEMBER

Side column legs come with cylinder brackets that are pre-assembled, pre-welded and pre-hung at
the factory to secure each hydraulic cylinder.

Comes with pre-drilled mounting holes so through bolts can be easily attached to the building columns
to help secure the door assembly to the building structure.


Pre-locates the hinges for the doorframe.

Easy installation.

Pre-locates the upper hydraulic cylinder brackets.

Extra Strength.

Provides additional structural support.

Myths That Can't be ignored when buying a hydraulic door:

Others may lead you to believe that because of the doors subframe . . .

Building does not have to be made stronger.

Building does not have to be modified to hold a door.

Building does not have to be engineered with extra reinforcement to accept a door.

Customer does not need to do anything to the building.

Door does not hang on your building.

Question 1

Will you be attaching the doors subframe header to our building structure in any way or will it stand alone by it's self?

Question 2

Will you be securing the vertical subframe side columns legs, that the cylinders are attached to, to the building structure or will they stand alone?

Schweiss's Statement

With all the myths listed above, it sounds like no one is relying
on the buildings structure for added support... I DOUBT IT!

Here's how it actually works

The horizontal subframe header tube is bolted / connected to the building's structural header.

The cylinders are attached to the verticle subframe columns and bolted / connected to the
building's side columns.

The cylinders are attached to the moving door frame while being fixed to the subframe side
columns legs, which are directly bolted / connected to the building structure.

The subframe and door rely on the building for support!


The subframe is an important part of delivering a pre-assembled
hydraulic door with the pre-located cylinder brackets and hinges for
ease of installation!

Telling your customers . . . "There is no need to do anything to the building
to accept a hydraulic door . . ." could be far from the truth or even unsafe!

Schweiss spec sheets call out the forces the
door exerts on the building structure

The building manufacturer / contractor / owner is responsible
to ensure that the building's structural design is capable of
handling all the imposed loads that the door exerts to your
door header, end wall, and building.

Your building header/column design must meet standard
deflection and strength criteria, both in vertical and horizontal
directions to support the Hydraulic door in all positions.

Schweiss provides easy-to-read, necessary specs sheets with
each door showing all the forces and building header

Spec Sheet image Schweiss Doors two styles to choose between
Schweiss Manufactures both styles of Doors. YOU can decide what is best for you!
Schweiss Bifold and Hydraulic Door Comparison

Schweiss offers both styles of doors

The Choice is yours!

Look for quality, look for price, you'll buy Schweiss.