R-value (insulation) contain no trapped CFCs or HFCs (e.g., half-pound low density foams). On certain brands, twenty-year tests have shown no shrinkage or reduction in insulating value. This has led to controversy as how to rate the insulation of these products. Many manufacturers will rate the R-value at the time of manufacture; critics argue that a more fair assessment would be its settled value. The foam industry adopted the LTTR (Long-Term Thermal Resistance) method, which rates the R-value based on a 15-year weighted average. However, the LTTR effectively provides only an eight-year aged R-value, short in the scale of a building that
Construction industry of the United Kingdom £15 billion projected cost. Prospective major construction projects include either expansion of London Heathrow Airport or expansion of Gatwick Airport, construction of the High Speed 2 rail line between London and the West Midlands, and construction of the Crossrail 2 rail line in London. The industry was pushed into a period of turmoil following the Brexit vote in June 2016. Fears of a lack of EU labour post-Brexit were cited as a key reason for the uncertainty. Despite this, the industry has been performing better than expected in the months since, leading to cautious optimism in some quarters. Construction industry