13 Flashing of edge trim profiles and integrated details

13.1 Flashing of roof edge trim profiles

The flashing of alwitra roof edge trim profiles (T plus, TW 125 plus, TA, TA-4F, TAG, art-line 1) and other industrially manufactured edge trim profiles is carried out with unbacked EVALON® tapes (e. g. 25 cm or 33 cm wide).

The tapes are kept in place in the profile along one edge and seal-welded to the roof sealing at the other edge, with an overlap.

Tapes at roof trim edges, which are installed at crescent-shaped roof perimeters, should be cut to fit the curve.

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13.2 Flashing to alwitra rainwater outlets, emergency outlets and vents

» Flashing of alwitra rainwater / emergency outlets

Flashing of alwitra rainwater outlets, emergency outlets and extension pieces is carried out with a custom-fit unbacked EVALON® connecting flange. The connecting flange is fastened to the drainage element using the corresponding screw ring. Therefore, check integrity and correct position of the oval gasket below the screw ring and, prior to installing the connecting flange, apply a thin film of lubricant to the gasket including the adjacent waterproofing surfaces at the flange.

Prior to finally tightening the screw ring, apply a continuous bead of EVALON® liquid between the screw ring and the connecting flange. When tightening the screw ring by hand with the alwitra screwing aid, a small amount of EVALON® liquid must ooze out evenly all around the flange. Then the connecting flange is seal-welded along the outer edge to the fixed roof waterproofing41.

Flashing of alwitra rainwater outlets

» Flashing of alwitra vents

For easy and reliable flashing to the roof sealing, alwitra vent stacks and alwitra cold roof vents are equipped with a factory-fitted EVALON® flashing strip. The factory-fitted connecting flange is to be seal-welded along its outer edge to the fixed roof waterproofing.

After fastening the alwitra refurbishment vent to the supporting construction, the ringshaped unbacked EVALON® connecting flange, which fits the corresponding vent type, is seal-welded along the inner edge to the foamed-in EVALON® flashing strip of the alwitra refurbishment vent, and along the outer edge to the fixed roof waterproofing.


41 Position stability of integrated details must be secured.


13.3 Flashing of roof penetrations with EVALON® sleeves

Flashing of roof penetrations to the roof waterproofing (e. g. cable or lightning conductor inlets, safety barriers and other round penetrations) is carried out with preformed EVALON® sleeves.

Place the EVALON® sleeves on the roof penetration so that the flashing collar will bear on the EVALON® waterproofing membrane. Then, homogeneously weld the flashing collar with hot air at a width of at least 2 cm around the outer edge to the roof waterproofing.

Put a heat shrink sleeve approx. 5 cm on the preformed detail (EVALON® sleeve) and heat it with hot air until it solidly seats/adheres to the integrated detail and the preformed detail.

Kapitel 13.3

At roof penetrations with a diameter of approx. 8 – 10 mm (e. g. lightning conductor), prior to placing the heat shrink sleeve, the spacer (included with the parts for sleeves Ø 18 mm) must be installed between the roof penetration and the preformed detail according to the illustration.

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13.4 Flashing of roof penetrations with cut-to-size sleeve from unbacked EVALON® material, 1.5 mm thick

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Homogeneously weld the flashing collar at a width of min. 2 cm all around the outer edge to the roof waterproofing, install a stainless steel pipe clamp on the sleeve to make it rainproof.


13.5 Flashing of kerbs of alwitra rooflights and smoke and heat vents

» Kerbs with collar

In the case of kerbs with a factory-equipped EVALON® flashing collar, the tapes are directly welded to the roof waterproofing after installing the kerbs.

» Kerbs without collar

The kerbs have to be sealed to the upper edge e. g. with self-adhesive EVALON® VSKA tapes, incl. necessary forming of corners with cut-to-size EVALON® tapes or preformed corners. The flashing sheets are to be welded to the roof waterproofing.

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At the upper edge the flashing must be fixed against sliding away and covered to make it rainproof.

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» Flashing of other rooflights and natural smoke vents made of PVC

Flashing can also be carried out by welding a sufficiently wide EVALON® tape directly to the horizontal flange of the kerb. Any standard hot air gun with an angled nozzle (e. g. 40 mm) producing hot air with a welding temperature of approx. 500 °C will be suitable. While welding be sure not to damage the kerb.

» Flashing of other rooflights and smoke and heat vents (not made of PVC)

Other kerbs, if not made of PVC, must be coated up to the dome around the circumference with self-adhesive EVALON® VSKA tapes (bonded), fixed on the top edge against sliding away and covered to make them rainproof.

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 13.6 Flashing of arcade rooflights to the roof waterproofing

Flashings of arcade rooflights are either carried out like wall flashings (see chapter 11), or unbacked EVALON® tapes or self-adhesive EVALON® VSKA tapes are integrated into the arcade rooflights structure42.

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42 To be confirmed with the manufacturer of the arcade rooflights.


13.7 Gravel stop made of EVALON® coated aluminium sheets

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At roof slopes > 3° to ≤ 5°, first an unbacked EVALON® tape (> 16 cm) is welded over the whole length to the centre of the underneath of the non-perforated, 8 cm wide flange of the gravel stop profile. The edges of this tape are then welded at the required width, along the trough, to the mechanically fastened drip edge made of EVALON® coated metal sheet, and to the roof waterproofing.

At roof slopes < 3° the gravel stop profile is fixed onto the EVALON® membrane roof sealing with EVALON® liquid.

In order to prevent shear forces, the gravel stop profile must be installed over a mechanically fastened drip edge profile made of EVALON® coated metal sheet.