Box gutter

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Box gutter joints with 1 special adhesive cartridge

To create the most precise box gutter joint possible, we recommend that you use the PREFA gutter bead opener to unscrew the overtightened box gutter bead (Fig. 1).
Roughen the glued surface with sanding paper. Then clean the ends of the box gutter with the provided cleaner. Wait for the cleaner to evaporate for about 5 min. (Fig. 2).
With PREFA special adhesive apply 1 bead (approx. 8 mm thick) approx. 50 mm before the end of the gutter (Fig. 3).
Overlap box gutter approx. 80 mm and twist together, place a rivet on the box gutter bead (Fig. 4).
Close rear edge. If the joint has been carried out correctly the glue should be bulging from the inside (Fig. 5).

To create the most precise box gutter joint possible, we recommend that you use the PREFA gutter bead opener to unscrew the overtightened box gutter bead above it (Fig. 1).
Apply a bead (approx. 8 mm thick) of PREFA special adhesive to the prepared gutter approx. 50 mm from the end (Fig. 2).
Overlap box gutter approx. 80 mm and twist together, place a rivet on the box gutter bead (Fig. 3).
Close rear edge (Fig. 4).
Rivet with PREFA patent rivets 4 x 9.5 mm in a cross stitch (Fig. 5).
- Box gutter 250: 6 pcs. Rivets per joint
- Box gutter 333: 8 pcs. Rivets per joint
- Box gutter 400: 10 pcs. Rivets per joint
- Box gutter 500: 12 pcs. Rivets per joint

In order to be able to make the joint without a gutter bead opener, the box gutter bead underneath is notched by 60 mm (Fig. 1 and 2).
The bead of the overlapping box gutter is opened 20 mm with round-nose pliers (Fig. 3).
The rear edge is to be opened with folding pliers approx. 80 mm along its length (Fig. 4).
Seal the gutter joint using PREFA special adhesive or PREFA special silicone. The box gutter is then twist into one another with an 80 mm overlap (Fig. 5) and the rear edge is closed again (Fig. 6).

Note

The variant is to be used without a gutter bead opener to connect the box gutter with a box gutter angle.

Prepare box gutter expansion joint installation: Push the gutter bead onto the box gutter and open the rear edge (Fig. 1).
Roughen the glued surface with sanding paper and clean with provided cleaner. Wait for the cleaner to evaporate for about 5 min. (Fig. 2).
Apply a bead of adhesive (approx. 8 mm thick) to both box gutter ends with PREFA special adhesive (Fig. 3).
Turn in the expansion joint and close the rear edge (Fig. 4).
Position the gutter bead and secure it with a rivet (Fig. 5).

Attention

Do not rivet the gutter bead on both sides, otherwise it will be unable to expand.

Note

The joint could be executed as a bonded and riveted version.

Crimp the metal about 4 mm outwards, gutter should overhang appr. 30 mm (Fig. 1).
Sweep to 90° with the hammer and seaming iron (Fig. 2).
Fold up the box gutter stop end and seal with PREFA special silicone or special adhesive (Fig. 3).
Fully assembled gutter end cap (Figure 4).

Gluing box gutter joints