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38 Cards in this Set

  • Front
  • Back
What is a bigger problem carpender ants or termites
How did termites get to Ontario?
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?
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?
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?
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?
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?
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