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The average payback time for residential solar PV in the UK was 11.4 years as of 2015, [30] but subsequent increases in the price of domestic energy have significantly decreased this. The April 2022 rise in the price cap saw payback times reduced on average by 2.5 years. [32]
5 July 2016: The 5 millionth image was submitted [12] 9 June 2014: The 4 millionth image was submitted [13] August 2012: 80% coverage of Great Britain & Ireland; 29 June 2012: The 3 millionth image was submitted [14] 14 August 2010: The 2 millionth image was submitted [15] 15 October 2008: Millionth image [8] 8 April 2008: 750,000 images [16]
A properly designed and installed extensive green-roof system can cost $108–$248/m 2 ($10–$23/sq ft) while an intensive green roof costs $355–$2,368/m 2 ($33–$220/sq ft) However, since most of the materials used to build the green roof can be salvaged, it is estimated that the cost of replacing a green roof is generally one third of the ...
The total land area of England, excluding inland water, is 130,310 km 2 (50,313 sq mi). [1] Crops and fallow land accounts for 30% of the land area, grasses and rough grazing 36%, other agricultural land 5%, forest and woodland 8%, and urban development 21%.
A flat roof includes pitches as low as 1 ⁄ 2:12 to 2:12 (1 in 24 to 1 in 6), which are barely capable of properly shedding water. Such low-slope roofs (up to 4:12 (1 in 3)) require special materials and techniques to avoid leaks. [4] Conventional describes pitches from 4:12 (1 in 3) to 9:12 (3 in 4). [4]
the definition follows a ‘bricks and mortar’ approach, with areas defined as built-up land with a minimum area of 20 hectares (200,000 m 2), while settlements within 200 metres of each other are linked. Built-up area sub-divisions are also identified to provide greater detail in the data, especially in the larger conurbations. [1]
Project Sunroof was created by Google engineer Carl Elkin as a 20% time project. While initially launching only in the cities of Boston, San Francisco, and Fresno, [3] the project now displays solar potential for 43 million homes in the US. [4]
Building codes in the U.S. specify ventilation rates as a minimum of 1 sq ft (0.093 m 2) of opening per 150 sq ft (14 m 2) (1:150) with a ratio of 1:300 in some conditions. [8] Warm air rises, so ceiling insulation is designed to have a higher r-value and the insulation is often installed between the ceiling joists or rafters.
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