Torch-On Membranes
Heated and applied directly to the primed surface using a torch, creating a strong seamless bond — the standard for flat concrete roofs and many reservoir repairs in South Africa.
Roofs · Foundations · Reservoirs
Bitumen Waterproofing for Roofs, Foundations & Reservoirs
Torch-on, self-adhesive and liquid bitumen waterproofing for roofs, foundations, retaining walls and reservoirs — installed by Damtech specialists across South Africa.
Heavy summer storms, temperature swings and years of UV exposure take a toll on roofs, slabs and retaining structures across South Africa. Bitumen waterproofing remains one of the most dependable ways to stop water ingress on concrete, metal and masonry — when the membrane is specified correctly and installed by trained applicators.
Where Bitumen Waterproofing Is Used
We apply torch-on, self-adhesive and liquid bitumen systems on flat concrete slab roofs, metal roof laps and flashings, basement and foundation walls, retaining walls, and water-retaining structures including reservoirs and canals. On farms and commercial sites, common jobs include leaking store roofs, damp rising through foundation walls, and reservoir repairs where a flexible membrane outperforms rigid coatings.
- Roofs (cement slabs and metal roofs)
- Foundations and basements
- Retaining walls
- Ponds and reservoirs
- Agricultural packhouses and stores
- Parapets, flashings and roof outlets
Waterproofing System Options
Compare bitumen systems
| System | Application | Best for |
|---|---|---|
| Torch-on membrane | Heat-welded sheets on primed surfaces | Flat roofs, reservoirs, large areas |
| Self-adhesive membrane | Peel-and-stick without open flame | Confined sites, parapets, detail zones |
| Liquid bitumen coating | Brush or roller applied | Corners, pipes, irregular shapes |
Self-Adhesive Membranes
Pre-applied adhesive backing for faster installation without open flame — useful on confined sites, parapet details and areas where hot work is restricted.
Bitumen Coatings
Liquid coatings applied with brushes or rollers for corners, pipe penetrations and irregular surfaces before wider membrane sheets are laid.
How Bitumen Membranes Perform in Local Conditions
Modified bitumen sheets are designed to flex with structural movement and resist ponding water on flat roofs. Torch-on installation melts the underside of the membrane so it bonds to the primed substrate — critical on concrete where adhesion failures cause the blisters and peeling many property owners describe. Self-adhesive variants suit confined areas where open flame is restricted.
Liquid bitumen coatings help for detailing around pipes, corners and irregular surfaces before wider membrane runs are laid. In high-UV zones we recommend protected membranes or appropriate surface finishes where the system will be exposed long term.
Leak Repair and Preventative Maintenance
Not every roof or wall needs a full strip-and-replace. We inspect first — checking for failed laps, blocked outlets, cracked parapets and trapped moisture under old paint — then propose repair or overlay options that match the budget and remaining life of the structure. Preventative maintenance programmes include scheduled inspections and spot repairs before minor leaks become structural damage or stock losses.
For agricultural and industrial clients, fixing a leaking roof before maize season or production ramps up avoids downtime and protects equipment stored underneath.
Bitumen vs Paint-Only or DIY Solutions
Acrylic roof paints can work as a reflective top coat on sound substrates but rarely fix active leaks on their own. Bubbles and flaking usually mean moisture is moving beneath the coating. Bitumen membranes address the waterproofing layer itself; they are not a cosmetic cover-up. Our technicians are trained in surface preparation, primer selection and lap widths — steps that determine whether a system lasts five years or twenty.
Why Damtech is Your Best Choice
- Free site inspection
- Satisfaction guarantee
- Expert advice at no cost
- Certified installation technicians
- Premium bitumen materials
- Competitive, transparent pricing
Book a free roof or dam inspection
We assess leaks, failed paint systems and membrane condition before quoting repair or overlay work.