Mastic Asphalter

A skilled hand-craft that requires applying asphalt to a variety of surfaces to create tough waterproof finishes.


The main purpose of this role is to lay mastic asphalt (a mixture of limestone and bitumen) to a wide range of structures and surfaces from flat roofs to balconies and walkways.

Mastic asphalt is a unique material laid in molten form so you’ll need to now how its correctly heated, agitated and applied to provide a smooth, seamless and waterproof finish.

This line of work is predominantly outside so prepare to be exposed to the elements and turn out in all weathers. 

You’ll also need to work as part of a team, liaising with site managers and surveyors and other constructions trades working on other parts of the building project.

Top 5 Tasks

  1. Assess a site and work out how much asphalt is needed
  2. Prepare, pour and spread the mixture to the surface and seal the joints
  3. Be responsible for ensuring you have the correct materials, tools and facilities for the project and conform to health, safety and welfare requirements.
  4. Work with specialist contractors across a range of projects
  5. Clean and prepare the area.


A newly trained mastic asphalter can earn around £17,000 – £20,000.

Trained with experience mastic asphalters can earn around £20,000 – £35,000.

Self-employed mastic asphalters can set their own rates. Salaries typically depend on location, employer and level of responsibility. 

Am I Suited?

  • Likes to work outdoors
  • Team player
  • Good with numbers
  • Practical
  • Physical
Mastic asphalt is one of the oldest construction products and was reportedly used by Sir Christopher Columbus to waterproof his ships as it provides seamless waterproofing.


Some employers may want you to have GCSEs (or equivalent such as the Welsh Baccalaureate) in English, Maths and Design and Technology or the BTEC Certificate to qualify.

Some experience of working on a building site can be useful in getting a foot in the door, but it’s not essential. If you haven’t worked in construction, think about being a labourer to start with. Then your boss may train you in asphalting.

An apprenticeship is a good way to start your career as a mastic asphalter. Entry to an apprenticeship scheme usually involves taking a selection test. As an apprentice, you study for NVQ Level 2 and 3.

The Institute of Roofing offers its own qualifications, and will be able to offer you help and advice.

Vacancies / Apprenticeships

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