Welding Bitumen

Cap sheets on roofs are usually referred to as modified bitumen. This widely used roof covering is usually comprised of sand, gravel or slate chips added to increase abrasion and UV-resistance.

Modified bitumen is either laid as a single strip on gazebos and sheds or as thicker sheets for flat roofs on large industrial buildings. Leister welding machines are a simple and safe hot air alternative to open flame welding, in particular for bitumen membranes, the thicker roofs made with modified bitumen.

This thicker type of bitumen membrane is also used for roofs on residential and commercial buildings.

Bitumen welding with hot air technology

Welding considerably thicker, modified SBS and APP bitumen sheeting with the flameless BITUMAT B2 from Leister is much safer, more cost-effective and more efficient than working with an open flame. 

Only one procedure is required by a single person, compared to working with an open flame, which requires two individuals.

Open flame vs. BITUMAT

Flameless welding with hot air gives considerably better welding results than using an open flame. The welding seam is straight and considerably narrower (also see images).

Peel test: Flame vs. BITUMAT


Working with the BITUMAT B2 also gives considerably better results in the peel test comparison between BITUMAT and open flame.