Bitumen Calculator
Calculate bitumen needed for waterproofing and roofing projects
Table of Contents
How to Use
- Enter the length and width of your surface area
- Select your preferred unit (meters or feet)
- Enter the desired bitumen layer thickness
- Click calculate to see the bitumen quantity needed
What is Bitumen?
Bitumen is a black, sticky, viscous liquid or semi-solid form of petroleum. It's commonly used in construction for waterproofing, roofing, and road paving. Bitumen provides excellent waterproofing properties, durability, and adhesion to various surfaces.
In waterproofing and roofing applications, bitumen is used as a binding agent in asphalt mixtures, as a coating for waterproof membranes, and as a sealant for joints and cracks.
Types of Bitumen for Construction
- Hot-applied bitumen - Heated to 150-220°C before application, used for built-up roofing
- Cold-applied bitumen - Ready-to-use at ambient temperature, ideal for repairs and smaller projects
- Modified bitumen (SBS/APP) - Enhanced with polymers for better elasticity and temperature resistance
- Bitumen emulsions - Water-based bitumen mixture for spray or brush application
- Bituminous membranes - Pre-manufactured sheets with bitumen coating
- Oxidized bitumen - Blown with air to increase hardness, used for industrial applications
Recommended Bitumen Thickness
| Application | Recommended Thickness | Notes |
|---|---|---|
| Waterproofing membrane | 2-4 mm | Multiple layers for enhanced protection |
| Flat roof coating | 3-5 mm | Hot-applied built-up roofing |
| Basement waterproofing | 2-3 mm | Applied externally below grade |
| Crack sealing | 5-8 mm | Fill and seal cracks in pavement |
| Prime coat | 0.5-1 mm | Primer layer before main application |
| Joint sealant | 6-10 mm | Expansion joints in concrete |
Bitumen Application Methods
- Hot mopping - Heated bitumen applied with mop or roller
- Torch application - Heat-welding bituminous membranes
- Cold application - Brush, spray, or trowel application of cold bitumen
- Self-adhering membranes - Peel-and-stick bituminous sheets
- Spraying - Pneumatic spray application for large areas
- Troweling - Hand application for small areas and repairs
Safety and Best Practices
- Wear appropriate PPE: heat-resistant gloves, safety glasses, protective clothing
- Ensure adequate ventilation when working with hot bitumen
- Never heat bitumen above manufacturer's recommended temperature
- Keep fire extinguisher nearby when working with heated materials
- Store bitumen in sealed containers away from ignition sources
- Apply in dry weather with surface temperature above 5°C (41°F)
- Allow proper curing time before exposing to water or traffic
- Follow local environmental regulations for bitumen disposal
Frequently Asked Questions
- How much bitumen do I need per square meter?
- For waterproofing applications, you typically need 1.5-2.5 kg/m² (0.3-0.5 lbs/ft²) per coat, depending on thickness and surface porosity. Built-up roofing systems usually require 3-5 coats, totaling 6-12 kg/m² (1.2-2.5 lbs/ft²). Always follow manufacturer specifications for your specific product.
- What's the difference between bitumen and asphalt?
- Bitumen is the binding agent, while asphalt is a mixture of bitumen and aggregates (sand, gravel). Bitumen is used in liquid or semi-solid form for waterproofing and roofing, whereas asphalt is used for paving roads and driveways. Both derive from petroleum.
- Can I apply bitumen in cold weather?
- Hot-applied bitumen should not be used when surface temperature is below 5°C (41°F) as it won't bond properly. Cold-applied bitumen and emulsions can work in cooler weather but check manufacturer guidelines. Ideal application temperature is 10-30°C (50-86°F) with dry conditions.
- How long does bitumen waterproofing last?
- Quality bitumen waterproofing systems can last 15-30 years when properly installed and maintained. Modified bitumen membranes with UV protection can last even longer. Lifespan depends on climate, UV exposure, foot traffic, and regular maintenance. Regular inspections and prompt repairs extend longevity.
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