Flat Roof Vents
![Cold Roof Vents](https://www.alwitra.co.uk/media/images/uploaded/products/31/cold-roof-vents.120.full.jpg)
Cold 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
![Refurbishment Vents](https://www.alwitra.co.uk/media/images/uploaded/products/30/refurbishment-vents.121.full.jpg)
Refurbishment Vents
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.
![Soil Vent Pipes](https://www.alwitra.co.uk/media/images/uploaded/products/29/soil-vent-pipes.122.full.jpg)
Soil Vent Pipes
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®