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Rainwater part 2


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Rainwater part 2

  1. 1. Part 2 Practice Plumbing Exams © 2016
  2. 2. • Regulations cover all aspects of the plumbing industry here we look at what covers rainwater: Building regulations part H Drainage and waste disposal BS EN 12056 parts 1–5 Gravity drainage systems – Inside buildings Practice Plumbing Exams © 2016
  3. 3. • PVCu guttering- most commonly used in domestic installations sizes from 75mm to 150mm is used on domestic installations • Cast iron- found on older and listed buildings • Extruded aluminum- common in commercial and industrial installations - guttering over 150mm is not normally installed on domestic properties and is used for commercial • NOTE - you must be aware that asbestos was used in the past to manufacture guttering and downpipes, this should be removed by a licensed contractor and replaced with plastic Practice Plumbing Exams © 2016
  4. 4. • Plastic has a high coefficient of linear expansion (0.00018) . This means if a gutter is not installed with the correct expansion allowance it will buckle and brake in hot weather. In cold weather guttering becomes brittle • PVCu guttering should be clipped at 1m apart max, more clips would be required for support if large amounts of snow can fall • Joining plastic guttering is done by a push fit system with a rubber seal in the fitting, the fittings also allow for expansion • PVCu is : • Lightweight and easy to use • Does not corrode and has a long life expectancy • It is cheep and economical Practice Plumbing Exams © 2016
  5. 5. • This is the standard shape for domestic installations, and is called half round • This is called deep flow and is similar to half round but can take a higher capacity of water • This is called ogee and is used to simulate the guttering on older buildings, giving it a look of original guttering found on listed buildings. • This is square line guttering and is used with square down pipes Practice Plumbing Exams © 2016
  6. 6. • Cast iron was used in installations before plastic was widely available it would be found on older and listed buildings you can get a gutter connection to convert from cast iron to plastic, this will keep the original look but give you the properties of plastic • On listed buildings you must replace like for like, you would not be allowed to convert to plastic Practice Plumbing Exams © 2016
  7. 7. • Cast iron is strong and durable but its disadvantages over weighs its advantages • Cast iron is : • Expensive, heavy, high maintenance, normally requires 2 people to install and is time consuming • Jointing cast iron together can be done by a bolt or oil based putty • A 50 teeth per inch tungsten tipped saw blade should be used to cut cast iron Practice Plumbing Exams © 2016
  8. 8. • This is the most recant material to be used in guttering systems used mainly on commercial and industrial buildings. Aluminium guttering can be formed in long lengths of up to 30m. The aluminium is formed with a extruding machine from the back of a van this means the guttering can be maid to fit on site it offers lightweight, seamless and corrosive resistant lengths • Joining aluminum together is done by using a non-setting mastic Practice Plumbing Exams © 2016
  9. 9. • Rainwater down pipe comes in round of square it is to be clipped ever 1.5m or less the standard size is 68mm Practice Plumbing Exams © 2016
  10. 10. Practice Plumbing Exams © 2016