Replacing a roof? It may contain asbestos cement.
Asbestos cement roofing, corrugated sheets, slates, and flat panels, was one of the most widely used building materials of the 20th century. Millions of buildings worldwide still have asbestos cement roofs, many of which are now reaching the end of their service life.
You cannot simply replace an asbestos roof as you would a conventional one. The material must be removed intact by licensed contractors following strict containment procedures to prevent fibre release. Breaking, cutting, or pressure-washing asbestos cement is illegal and extremely dangerous.
After removal, the asbestos waste must be transported and disposed of at licensed facilities with proper documentation. Only then can the new roofing be installed.
The Problem
Commercial buildings with flat roofs, low-pitch roofs, or corrugated roofing from before 2000 have a high probability of asbestos cement. Roof leaks, weathering damage, or energy efficiency upgrades often trigger replacement projects that must account for asbestos.
Commercial roof replacement while the building remains occupied requires careful containment planning. The business continuity impact of asbestos removal must be planned alongside the construction programme to minimise disruption to operations.
What You Need
Frequently Asked Questions
How long after asbestos removal is it safe?
After professional removal, a 4-stage clearance procedure is followed, including a visual inspection and air monitoring. The area is only certified safe when airborne fibre levels fall below 0.01 fibres per millilitre.
Is it okay to scrape moss off an asbestos roof?
No, scraping or pressure-washing an asbestos cement roof releases fibres and accelerates deterioration. Use a specialist biocide treatment applied gently, or consult a licensed contractor about safe cleaning methods.
Can you jet wash an asbestos roof?
No, jet washing or pressure washing asbestos cement roofing is strongly discouraged as it damages the surface and releases fibres. Chemical moss treatments that do not require abrasion are the recommended alternative.
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