Flat Roof Vents

alwitra^® cold roof vents can be welded directly to the corresponding roof waterproofing without any additional materials.

• The vent cowl, together with the weather cap, provides rainproof protection of the vent pipe
• At the lower end of the vent, a drip pan will collect any condensate, which will eventually evaporate. This is to prevent or reduce moisture penetration of the thermal insulation

The alwitra^® refurbishment vent 160 is made of CFC free PUR integral foam.

• At the factory, an EVALON^®® sealing ring is foamed into the welding flange. The sealing ring ensures permanently reliable flashing against the new roof waterproofing.
• To this end, a prefabricated EVALON®  flashing collar is homogeneously welded to the sealing ring and the adjacent roofing membrane in the same way as the seam connection of the field membranes.

The alwitra^® soil vent pipe forms the upper end of vent pipes protruding over low slope roofs with waterproofing of any constructional type up to DN 125 (OD 125).

• The soil vent pipe consisting of one single pipe extends over the roof build-up without any joints and is connected to the downpipe DN 125 (OD 125) and DN 100 (OD 110) below the roof structure by means of the included reducer.
• A corresponding reducer (125/75) is available for downpipes DN 70 (OD 75)
• The connecting flange can be made with EVALON®