Driver’s cab:
Functioning, smoothness and free movement of instruments and operating equipment as well as the stability of supporting parts must not be impaired by modifications performed at the cab. If the cab is to be built over, the permitted centre-of-mass position and the permitted front-axle load is to be considered.

Roof loads/roof racks:

Box-type delivery vans and station wagons:

• Max. 300 kg (vehicles with high roof: 150 kg) if the load is uniformly distributed over the entire roof surface.
• A stabilizer bar must be installed at the front axle.
• The roof rack must have at least 5 sustainers (with a roof of 300 kg) or 4 sustainers (with a roof of 150 kg). The sustainers are to be evenly positioned.
• If the roof rack is shorter, the loading has to be reduced proportionally.

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Vehicles with cab or double cab:

• Max. 100 kg if the load is uniformly distributed over the entire roof surface.

Note: The installation instructions only apply to box-type delivery vans and station wagons.

Roof heightening (plastic roof):

• Install a stabilizer bar at the front axle
• If roof cladding and roof bow are separated and if no continuous profile frame is possible, additional roof bows are required.
  
  Number:
  4 Bow with wheel base 3.000 mm
  5 Bow with wheel base 3.550 mm
  6 Bow with wheel base 4.025 mm
  
  Arrangement
  1. behind the driver’s cab doors (B-pillar)
  2. in the middle of the sliding door (between B-pillar and C-pillar)
  3. in the middle of the vehicle behind the sliding door (C-pillar)
  4. to 6. between C-pillar and rear pillar
  
  
• The connection between bows and side walls must be laid out in such a way that a locked-force connection is ensured (flex-resistant connection of bow and roof chassis). The new roof structure must correspond to the standard roof relating to stiffness. The required minimum moment of inertia (Ix) of the roof bows can be taken from the following table.
  
  
• Roof height Moment of inertia (Ix), per bow 250 mm 40.000 mm4 400 mm 65.000 mm4 550 mm 86.000 mm4 These specifications are based on an e-modulus of the plastic roof of 7,000 N/mm2 and a wall thickness of 4 mm.

Roof height	Moment of inertia (Ix), per bow
250 mm	40.000 mm4
400 mm	65.000 mm4
550 mm	86.000 mm4
These specifications are based on an e-modulus of the plastic roof of 7,000 N/mm2 and a wall thickness of 4 mm.

• In case of deviations, it is required to ask the responsible department for a permission.

Notes:

• Plastic roofs are only suitable to a limited extent for mounting roof lamps.
• The roof load is limited.

Rising roof

• If a rising roof is to be mounted, at least two thirds of the original roof surface must be maintained.
• Do not remove any cross-beams or supporting parts.

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Air baffles: Air baffles on the cab roof may only be attached with retainers at the door frame or at the rear welding flange (back wall of roof). Bores in the cab roof are not permitted for attaching components. If other roof attachments (e.g. air-conditioning system) are to be installed, it is required to ask for the permission of Volkswagen AG.