Search results
Results from the WOW.Com Content Network
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]
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.
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]
The area is defined as 'area to mean high water excluding inland water'. [ 2 ] The list consists of 164 non-metropolitan districts , 32 London boroughs , 36 metropolitan boroughs , 62 unitary authorities , and two sui generis authorities (the City of London and the Isles of Scilly ).
Flat roofs, or "low-slope" roofs, are also commonly found on commercial buildings throughout the world. The U.S.-based National Roofing Contractors Association defines a low-slope roof as having a slope of 3 in 12 (1:4) or less. [2] Flat roofs exist all over the world, and each area has its own tradition or preference for materials used.
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 ...
A roof (pl.: roofs or rooves) is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. [1] A roof is part of the building envelope.
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]