SBS, Torch-On and Mod-Bit Are the Same System
If you have been quoted SBS, two-ply torch-on or modified bitumen (mod-bit), those are three names for one thing — a two-ply, heat-welded modified-bitumen membrane. It is widely considered the king of flat-roof membranes, and it is used in both commercial and residential applications, from multi-level and tower construction down to residential flat sections.
Why Two-Ply Beats Single-Ply
SBS is built in two plies, so you get a redundant, fully-bonded waterproof layer instead of just one. Single-ply systems (EPDM, TPO and PVC) mainly compete on warranty length — 10, 15 or 20 years — while a properly installed two-ply SBS roof is built to last and stay leak-free. We detail every seam, flashing and penetration by hand.
How a Torch-On Install Goes
We strip to the deck and fix what we find, then install the base sheet and torch the cap sheet over it, heat-welding the two plies into one continuous membrane. Every wall, vent, drain and skylight gets hand-detailed flashing, because penetrations are where flat roofs fail. Torch work demands real training and fire discipline. Our crews are experienced, insured and WCB covered, and we finish every torch day with a fire watch before we leave the site.
Where SBS Makes Sense
SBS shines on Calgary roofs that take real abuse: commercial decks with rooftop units and foot traffic, residential flat sections over living space, and any roof where a leak means closing a business or tearing out a ceiling. If your building fits that description, two plies beat one, every time.
