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Why flat roofs need a little extra love (and insulation)




What with the cost of living crisis and uncertainty in the economy, it’s hardly surprising that most of us are hunting for the best deal – particularly when it comes to home improvements.


However, there are downsides in always going for the cheapest option – especially when it comes to upgrading insulation on flat roof projects.

The same is true for businesses. Even when a roof survey indicates that installing a new roof is the best option, many choose not to proceed. The main reason for this is the higher project cost associated with upgrading insulation levels to meet current building regulations, which is a requirement for a new roof.


It makes sense to save a pound or two, but here's the catch: skipping out on roof insulation could end up costing you more in the long run – and certainly isn't doing the planet any favours. Building regs are part of the government’s effort to reduce our carbon footprint.


The current Building Regulations state that when refurbishing an existing roof over heated space, the minimum insulation threshold of U-value 0.35 W/m²K must be achieved to avoid the need to upgrade the roof insulation along with the waterproofing.


Upgrading roof insulation is important


Most roofs that meet this minimum value can avoid condensation issues and can be overlaid with a waterproofing membrane alone. However, if there is insufficient or no insulation in the roof build-up, the roof should, if feasible, be upgraded with roof insulation to achieve a minimum U-value of 0.18 W/m²K for commercial buildings, 0.16 for residential and 0.15 for new build residential.


Aside from the risk of leaking, failing to act might land you in hot water with insurance and mortgage companies further down the line, who want proof your roof work is up to scratch with the latest rules before handing over the cash.


Opting for a quick fix and skipping the insulation might seem like a money-saver. You get a new waterproofing membrane, a shiny BBA certificate, and some sort of guarantee.


But here's the kicker – that guarantee comes with loads of exceptions because you skipped out on the insulation part. Building owners and tenants are all about the here and now. Long-term thinking is out the window, whether it's a leaky roof or a saggy timber deck.


The cost of repairing a flat roof


Factors such as the COVID-19 pandemic, rising business rates and rentals have made companies more inclined to be nomadic, preferring to relocate rather than undertake costly repairs or refurbishments. Long-term repairing leases are becoming less popular due to business uncertainties.


So, what is the solution? Until the government establishes legislation requiring all buildings to meet a comprehensive thermal standard, roofing manufacturers must exercise caution and be extra vigilant when submitting designs.


In a perfect scenario, the importance of quality would surpass that of price, but presently, we are a long way from realising this ideal. In many instances, the lowest bid will persist in securing contracts, but one must question the actual expense involved.


It might even be worth pondering the possibility of dismantling structures that fall short of meeting the updated environmental standards, although that discussion can be saved for another occasion.


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