How much does it cost to replace an asbestos roof?
Worried about the asbestos in your roof? There might be a cheaper, equally safe option to replacing your asbestos roof...
How much does it cost to replace an asbestos roof?
Whether your roof is comprised of asbestos concrete cladding, asbestos tiles or you don’t know, the cost could vary. As a company we prioritise safety at all times, preferring to air on the side of caution with asbestos, but recognise that cost is a major factor too.
To assess a roof for asbestos, you should assess the overall state of the roof, generate risk assessments involved, current and future maintenance work, and abatement and how the owner or property maintenance contractor should proceed.
The following guidelines and considerations should be made to replace the roof:
- close proximity to public, workers or owners
- material frailty: prone to flakes and cracks
- asbestos fibre exposure
- crumbling, cracks or detachment
- close proximity to drainage systems
- asbestos stalactite formation
- excessive biological (fungal, plants) that accelerate breakage and decay
- high-risk areas: (hospitals, schools, homes, etc).
- independent testing has identified asbestos fibres in the surrounding air that are in excess of the acceptable limit
- recommended by HSE advisor or consultant
When and how to inspect an asbestos roof?
Our guidelines for dealing with an asbestos roof, concerning regulations and tips, are provided here. We recommend inspections are performed when the roof is dry to maximise visibility.
To arrange an inspection, contact us on 01633 250652 or send us an email here.
In general, there are two proven options when dealing with an asbestos roof:
1. Full roof replacement
Defined as the replacement of the underlying deck or support structure and complete removal of the asbestos structure:
- replacement of the roof itself (cladding, concrete asbestos) is desired for a long-term solution
- up to 25% or more of the roof is compromised (brittle, flakes easily, holes)
- the support structure (timber decking, concrete, metal) has been contaminated or compromised via water seepage
- total elimination is required (e.g. schools, hospitals, etc) to mitigate all asbestos risk
- Required by HSE
- Risk of contaminating the surrounding area
For flat roofing replacements, we recommend glass fibre or single ply and have a range of pitched roof options here. Regardless, the overall cost depends on the desired material to replace it with (metal cladding, glass fibre, single ply, etc), as well as dealing with the asbestos and the setup of the scaffolding.
Defined as the application of a water-proof and chemically-resistant coating with significant structural integrity. Simply lining the asbestos structure would cost £70/m2 (per square meter), but this does not account for the possible scaffolding and waste removal. However, coating an asbestos roof can be a fraction of the cost of a full replacement and can benefit from the huge structural integrity of a glass fibre lining system.
We recommend encapsulation when:
- the underlying support structure has not degraded
- a safe, cost-effective solution is preferred
- the roofing structure (e.g. timber decking, concrete or metal) is still maintained - degradation is negligible
- a long-term preventative solution is preferred - our GRP have proven lifetimes in excess of 30+ years
How to select an asbestos roof encapsulation system
When encapsulating a flat roof, single ply is simply glued to the roof using an adhesive, which ultimately risks peeling off over time. These types of adhesives are largely superficial and do not penetrate the asbestos structure in the way that glass fibre resins do. What is more, no standard test exists to determine the effectiveness of the asbestos-adhesive-single ply bond, since asbestos surfaces are highly variable and standardised laboratory tests do not account for this variability.
With glass fibre encapsulation, the resin is in a liquid form and is able to saturate the surface of the roof and penetrate deep into the pores, cracks and small holes. As the resin hardens or cures, it becomes one with the asbestos roofing structure. A glass fibre mat (strands of fine glass fibre fragments) saturated in the resin are used as a backbone to provide structural support to the asbestos roofing structure. This composite is widely recognised by the construction industry as a highly effective, one-time only solution with an expected lifetime exceeding 30 years. Glass fibre composites are highly effective for lining and coating multiple surfaces and for creating flat roofs.
Like single ply, spray on systems do not provide adequate protection in our opinion, meaning that impact to the roof could again expose the underlying asbestos.
What to consider when dealing with an asbestos roof
Whether you have an asbestos roof on your factory, shed or property, any project to encapsulate or replace an asbestos roof should need to budget for 4 main areas:
- Scaffolding: to allow roofing access in high-risk or hazardous areas
- Materials: glass fibre etc., used to encapsulate or replace your flat roof
- Waste disposal: asbestos is hazardous and must be disposed of in a HSE-compliant manner
- Downtime: time to completion and possible business downtime to vacate areas at risk of exposure during repair work
To find out more about what to do if you have asbestos in your roof, see our guidelines.
THINKING OF ARRANGING A SPECIALIST TO REMOVE ASBESTOS FROM YOUR ROOF?
If you think your roof or insulation contains asbestos, we recommend you contact a specialist to arrange a site visit.
As a business running since 1976, we specialise in flat and pitched roofing and asbestos removal. At Strandek® GRP Systems we're able to perform site surveys and facilitate the safe removal of asbestos materials from your roof, as well as install asbestos-free insulation and roofing installation.
Contact us today on 01633 250652 to speak to a technical specialist or send us an email.