Housing 2
Terms
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- What is a bigger problem carpender ants or termites
- Termites
- How did termites get to Ontario?
- Imported
- What is the difference b/w carpender ants and termites?
- Carpender ants chew wood to create a place to live and termites chew wood for food.
- Why are termites hard to detect?
- They eat the inside of the wood and leave the surface?
- How do you detect termites?
-
probe with a sharp object.
-replace wood and chemically treat - What are the indicators that a basement is dry?
- Lots of storage stuff
- What do you look for to determin if floor coverings are ok
- adhesive comming through floor
- What does eflorences used for?
-
see on walls, brick and poured concrete.
-moisture penetrates and picks up salts and carries it if there is a lot then see eflorences if not alot then stays on walls. Tells you that moisture barrier no longer working. - Give 3 problems that can be found in basements
-
-improper sloping
- foundation drainage system might not be working.
- might not have drainage system prior to 1940's
- storm water drainage system could back up. - - cutting holes in basement walls below grade creates problems how do you solve this?
- put a well and there needs to be drainage hole.
- How high do crawl spaces go to?
- around 2"
- Are crawspaces practical?
-
No
usually not finished - soil floors
plumbing visible
- heating visible - What 2 purposes does plumbing serve?
-
-removal of waste
-supply of potable water - What is potable water considerations?
-
-sufficient supply of water to each fixture
-no opportunity for the back flow of contaminated water. - What is considered when designing waste?
-
1. Quick removal with min chance for stoppare of drains or leakage.
2. Prevent entrance of vermin and sewer gas from plumbing system or sewage. - If the house is designed properly what are the only ways that vermin can enter?
-
toilet
floor drains. - What is the composition to sewer gas?
- No definite composition.
- What is causes backflow?
- cross connection (arrangement b/w 2 piping systems).
- What is the favourable pressure?
- To the potable side
- Are crossconnections legal?
- yes
- What is the intended source of a potable supply?
- Municipal treatment plant
- Give 6 systems that backflows can happen?
-
1. boiler system
2. steam systems
3. aspirators
4. autoclaves
5. chlorinators
6. swimming pools - How can you prevent cross connection back flow?
- air gap
- What is the definition of an air gap?
- distance b/w the fauscet openning and overflow rim.
- What is the min distance for air gap?
- 1"
- How can an air gap be measured?
- by 3X diameter of pipe, so 1/2 inch pipe - airgap of 1 and 1/2"
- Ideally where do you put an air gap?
- As close the source as possible
- In a surge tank what is the color of the potable side? What is the colour of the non potable side?
- Green, yellow
- Vacuum breaker?
- breaks syphanage by letting air to enter the piping system.
- Where should put the vacuum breaker?
- As close to the source of contamination as possible.
- What is a common vacuum breaker?
- Non pressure
- Vacuum breaker is place where?
- 5 cm above flood rim or more
- Where is non pressure type VB's placed?
- downstream from the valve so that water passes throught the valve to the vaccume breaker
- What is most common non pressure or vacuum breakers?
- non
- How can you tell if it is a non pressure type vacuum breaker?
- if vacuum is placed b/w valve and source of contamination
- Where are non pressure vacuum breakers found?
- Industrial and not homes
- Where are pressure type vacuum breakers found?
- upstream of valve. Requires constant water pressure
- What is the min distance to contamination?
- Can't be closer than 30cm