Waterproofing system
APP Waterproofing Systems
APP waterproofing systems use atactic-polypropylene modified bitumen membranes with high heat resistance for exposed and protected roofs. PetroGrip APP is manufactured with polyester (and composite polyester-fiberglass grades) in multiple thicknesses and surfacings for Pakistan roof conditions.
System build-up
- Primer
- Base sheet if multi-layer
- PetroGrip APP cap or single ply as designed
- Aluminum, granular, or protected finish
Substrate
- —Concrete roof slabs
- —Compatible decks per specification
Critical details
- —Falls to outlets
- —Upstands
- —Overlap welding
Limitations
- —Plain PE both sides is for protected systems, not permanent UV exposure
Installation sequence
- Verify falls
- Prime
- Torch APP
- Detail
- Finish/protect
Related applications
- Roof Waterproofing Pakistan
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- Waterproofing Company Lahore
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Related products
- PetroGrip APP
APP-modified torch membrane—2mm to 4mm with plain, aluminum, or granular surfacing.
Related projects
Technical downloads
- PetroGrip APP Polyester Fiberglass Membrane TDS
APP-modified torch-applied membrane with composite polyester + fiberglass reinforcement — 3 mm and 4 mm plain PE film finish.
Technical guides
- APP vs SBS Bitumen Membrane: Which PetroGrip System Fits Your Project?
Compare PetroGrip APP and SBS torch-applied membranes—modifier chemistry, surfacing options, and where each system belongs in roof and below-grade build-ups across Pakistan.
- Torch-Applied Waterproofing: PetroGrip Site Practice
How PetroGrip torch-applied bitumen membranes are specified, primed, and welded on roofs and podiums—with quality checks that protect your warranty.
- APP vs SBS for Pakistan’s Climate (Roofs and Below Grade)
Heat, UV, monsoon recharge, and thermal movement—when PetroGrip APP caps beat SBS on Punjab roofs and when SBS is mandatory below grade.
- 3mm vs 4mm Waterproofing Membrane: When to Specify Each in Pakistan
Thickness selection for PetroGrip APP and SBS torch membranes—substrate condition, traffic, double-layer basements, and what 3mm or 4mm actually changes on site.
FAQ
- What thicknesses are available?
- PetroGrip APP is offered in multiple thicknesses including 3 mm and 4 mm composite polyester-fiberglass grades documented in the APP TDS.