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 EVALASTIC® 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 waterproofing at the other edge, with an overlap.

Skizze zum Text

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

Skizze zum Text

13.2 Flashing of 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 EVALASTIC® 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.

Then the collar fastened with the screw ring is to be fully welded to the flange of the rainwater outlet, emergency outlet or the extension element. Subsequently, the collar is seal-welded along the outer edge to the fixed roof sealing 35.

EVALASTIC Dachabläufe

» 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 EVALASTIC® 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 EVALASTIC® connecting flange, which fits the corresponding vent type, is seal-welded along the inner edge to the foamed-in EVALASTIC® flashing strip of the alwitra refurbishment vent, and along the outer edge to the fixed roof waterproofing.

Vent stack, refurbishment vent, cold roof vent


35 Position stability of integrated details must be secured.

13.3 Flashing of roof penetrations with EVALASTIC® 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 EVALASTIC® sleeves.

Place the EVALASTIC® sleeves on the roof penetration so that the collar will bear on the EVALASTIC® waterproofing membrane. Then, homogeneously weld the 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 (EVALASTIC® sleeve) and heat it with hot air until it solidly seats / adheres to the integrated detail and the preformed detail.

two drawings (see text)

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.

8-10 mm (see text)

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

zwei Skizzen zum Text

Homogeneously weld the 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 roof lights and natural smoke vents

» Kerbs with collar

In the case of kerbs with a factory-equipped EVALASTIC® collar, the collar is directly welded to the roof waterproofing after installing the kerbs.

Sealing of kerb 1600

Sealing of kerb 3020

» Kerbs without collar

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

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

» Flashing of other rooflights and natural smoke vents

Other kerbs must be coated up to the dome around the circumference with self-adhesive EVALASTIC® VSKA tapes (bonded), fixed on the top edge against sliding away and covered to make them rainproof.

Lichtkuppeln anderer Hersteller EVALASTIC

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 EVALASTIC® tapes or self-adhesive EVALASTIC® VSKA tapes are integrated into the arcade rooflights structure 36.

Skizze zum Text


36 To be confirmed with the manufacturer of the arcade roof light.