1:5:10:365 EcoTip Blog

May 3, 2008

:124 Window Leaks

Filed under: :124 Window Leaks — Tags: , , , , , , — John Banta @ 12:25 am

Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet.

1:5:10:124 Tip: Windows can leak in ways that aren’t obvious. Today’s tip is to temporarily block those weep holes I talked about yesterday with some soft putty and fill the bottom track with water. Watch to see if the water visibly leaks out or the water level drops. If so – then fix the leaks. Don’t forget to unblock the weep holes when you are finished with the test. Plan on letting the water stand in the track for about an hour. If you can see the water level dropping then stop the test early by opening up the weep holes and letting the track drain. Long term water leaking into wall cavities through window leaks can cause mold growth in the wall cavity. So these types of problems need to be discovered and fixed early. The amount of water that might go into the wall from the test is small enough that it shouldn’t cause a problem by itself – but depending on how long the leak has been present – there may have already been enough water entry to cause a mold problem. When in doubt – its best to call in a professional to confirm the nature of the leaks and make repairs.


 Additional Information

Suggested Review – 123

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April 20, 2008

:111 Fill a Bag – Checking HVAC Flow

 Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet.

1:5:10:111 EcoTip: In order for central air conditioning systems to function efficiently, it is necessary for them to be free of significant leaks and be balanced. This means that the air supply is flowing somewhat equally throughout the system. In an unbalanced system you might have too much air going to one area and not enough in others. There are sophisticated duct balancing systems that can be used to professionally perform these checks, but an inexpensive simple do-it-yourself method was developed by the Canadian Mortgage and Housing Administration using a plastic garbage bag, coat hanger, duct-tape and a timer.

image credit: Lawrence Berkeley National Laboratory


Additional Information

Suggested Review – :110

The CMHC says to use a Glad 66 cm x 91 cm garbage bag. Which is about 2ft X 3ft when it is laid out flat. The coat hanger is bent into a circle, shape that will fit all the way around the heating and cooling supply registers you have in your home. You may need to reshape it for different openings. Tape the edge of the plastic bag to the coat hanger.

To test your duct system – turn your HVAC fan unit to on. It is not necessary to have it actually heating or cooling  –  just blowing. Place the completely deflated garbage bag over a supply register and time how long it takes the bag to inflate completely. Record this time for all the supply registers. Now place the fully inflated garbage bag over each return register record how long it takes for the bag to deflate.

The total inflation time for the supply registers should equal the total deflation time for the return registers. If there is only one return register, you may find it deflates too quickly to measure accurately. In this case you might try using two bags simultaneously over the return register.

If it takes 2 seconds for bag to inflate that is approximately 75 cubic feet of air per minute coming into the room. This is pretty good for a standard size room. Same size rooms should have approximately the same amount of air delivered to them. Half size rooms should have about half the air. Serious deviations should be checked. A duct may have come loose or the system may not have been designed properly.

The following table from CHMC shows ratio between inflation times and airflow rates.

Time to inflate a plastic trash bag (66 cm x 91 cm [26 in. x 36 in.]


Approximate time to inflate bag

5 L/s (10 cfm)

13 seconds

10 L/s (20 cfm)

8 seconds

15 L/s (30 cfm)

5 seconds

25 L/s (50 cfm)

3 seconds

If more air is required, adjust the grille openings at the supply register in the room. Keep in mind that bedrooms require more fresh air when occupied by more than one person. http://www.oee.nrcan.gc.ca/Publications/infosource/Pub/hrv/hrvsystem.cfm?text=N&printview=N#airflow



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