VD-GL
Wall abutment flashing with a drip edge for better watertightness.
Category
Wall abutment flashings
Unit
per linear metre
Category guide
The wall abutment flashing closes the junction of roof and wall: the side junction against a higher wall, the head junction below a wall, the junction with the parapet of a flat roof and the transition over clay tiles (type 1 and type 2). The smaller version serves zones with a small volume of water. The aim is that water from the wall ends up on the roof covering and not in the junction.
The sheet is steel S320GD, galvanising Z275 (275 g of zinc per m², both sides) to EN 10346, polyester coating 35 µm. It is folded on a CNC machine to a tolerance of 0.2 mm, so the profile repeats identically on every piece. The sheet standard guarantees the steel substrate and the zinc thickness, not the shape — the shape and the developed width are set by the customer.
The upper fold of the wall abutment flashing is tucked under the facade or into a chase in the wall and sealed with a permanently elastic sealant (MS polymer), while the lower part overlaps the roof covering in the direction of flow. The pieces are laid from the eaves towards the ridge with overlaps; with trapezoidal sheet the wall abutment flashing for trapezoidal sheet from the flashings category is used. The version with a drip edge is used at junctions where the wind drives the water towards the wall.
Questions and answers
The wall abutment flashing is the sheet-metal flashing at the junction of roof and wall — a chimney, a higher adjoining wall, a parapet: the upper part goes under the facade or into a chase, the lower part overlaps the roof covering, so the water from the wall runs onto the roof instead of into the junction. It is folded from galvanised steel S320GD Z275 to EN 10346 with a coating of 35 µm.
The upper fold is tucked under the facade or into a chase cut in the wall and sealed with a permanently elastic sealant for sheet metal (MS polymer), and not with acid-cure silicone, which attacks zinc. The sealant supplements the mechanical overlap, it does not replace it; the sheet is S320GD Z275 to EN 10346.
Type 2 has a wider lower fold that covers the profile of the tiles more deeply, so it is used with high-profile tiles and larger catchment areas; type 1 is the standard version. Both are folded to measure to a tolerance of 0.2 mm.