A building envelope comprising a fire resistant tape and a fire resistant barrier material, wherein the fire resistant tape seals a seam between a first sheet of the fire resistant barrier material and a second sheet of the fire resistant barrier material, wherein A) the fire resistant barrier material comprises - a metallic layer of the fire resistant barrier material which is preferably an aluminum layer having a thickness in a range between 6 μm and 100 μm, - a support layer of the fire resistant barrier material comprising • a glass fiber fabric having a specific mass in a range between 50 g/m 2 and 500 g/m 2, or • a glass fiber scrim having a specific mass in a range between 5 g/m 2 and 50 g/m 2, and - a glue layer of the fire resistant barrier material between the metallic layer and the support layer, the glue layer glue having a specific mass in a range between 0.5 g/m 2 and 15 g/m 2, and B) the fire resistant tape comprises - a metallic layer of the fire resistant tape, which is preferably an aluminum layer having a thickness in a range between 6 μm and 100 μm, - a support layer of the fire resistant tape comprising - a glass fiber fabric having a specific mass in a range between 50 g/m 2 and 500 g/m 2, or - a glass fiber scrim having a specific mass in a range between 5 g/m 2 and 50 g/m 2, - a glue layer of the fire resistant tape between the metallic layer of the fire resistant tape and the support layer of the fire resistant tape, the glue layer having a specific mass in a range between 0.5 g/m 2 and 15 g/m 2, and - an acrylic pressure sensitive adhesive coating layer on the support layer of the fire resistant tape, the acrylic pressure sensitive adhesive coating layer having a specific mass in a range between 20 g/m 2 and 200 g/m 2. A) the fire resistant barrier material comprises - a metallic layer of the fire resistant barrier material which is preferably an aluminum layer having a thickness in a range between 6 μm and 100 μm, - a support layer of the fire resistant barrier material comprising • a glass fiber fabric having a specific mass in a range between 50 g/m 2 and 500 g/m 2, or • a glass fiber scrim having a specific mass in a range between 5 g/m 2 and 50 g/m 2, and - a glue layer of the fire resistant barrier material between the metallic layer and the support layer, the glue layer glue having a specific mass in a range between 0.5 g/m 2 and 15 g/m 2, and - a metallic layer of the fire resistant barrier material which is preferably an aluminum layer having a thickness in a range between 6 μm and 100 μm, - a support layer of the fire resistant barrier material comprising • a glass fiber fabric having a specific mass in a range between 50 g/m 2 and 500 g/m 2, or • a glass fiber scrim having a specific mass in a range between 5 g/m 2 and 50 g/m 2, and • a glass fiber fabric having a specific mass in a range between 50 g/m 2 and 500 g/m 2, or • a glass fiber scrim having a specific mass in a range between 5 g/m 2 and 50 g/m 2, and - a glue layer of the fire resistant barrier material between the metallic layer and the support layer, the glue layer glue having a specific mass in a range between 0.5 g/m 2 and 15 g/m 2, and B) the fire resistant tape comprises - a metallic layer of the fire resistant tape, which is preferably an aluminum layer having a thickness in a range between 6 μm and 100 μm, - a support layer of the fire resistant tape comprising - a glass fiber fabric having a specific mass in a range between 50 g/m 2 and 500 g/m 2, or - a glass fiber scrim having a specific mass in a range between 5 g/m 2 and 50 g/m 2, - a glue layer of the fire resistant tape between the metallic layer of the fire resistant tape and the support layer of the fire resistant tape, the glue layer having a specific mass in a range between 0.5 g/m 2 and 15 g/m 2, and - an acrylic pressure sensitive adhesive coating layer on the support layer of the fire resistant tape, the acrylic pressure sensitive adhesive coating layer having a specific mass in a range between 20 g/m 2 and 200 g/m 2. - a metallic layer of the fire resistant tape, which is preferably an aluminum layer having a thickness in a range between 6 μm and 100 μm, - a support layer of the fire resistant tape comprising - a glass fiber fabric having a specific mass in a range between 50 g/m 2 and 500 g/m 2, or - a glass fiber scrim having a specific mass in a range between 5 g/m 2 and 50 g/m 2, - a glass fiber fabric having a specific mass in a range between 50 g/m 2 and 500 g/m 2, or - a glass fiber scrim having a specific mass in a range between 5 g/m 2 and 50 g/m 2, - a glue layer of the fire resistant tape between the metallic layer of the fire resistant tape and the support layer of the fire resistant tape, the glue layer having a specific mass in a range between 0.5 g/m 2 and 15 g/m 2, and - an acrylic pressure sensitive adhesive coating layer on the support layer of the fire resistant tape, the acrylic pressure sensitive adhesive coating layer having a specific mass in a range between 20 g/m 2 and 200 g/m 2.