You can Linas that is why it is hard to find in use anymore , Canadians just think it has rotted away lol
How can you tell? 10 people laying around the foundation . and a tray of brownies .
HA! Nice. 
If your mason keeps complaining about having the munches…
If your smoke alarms keeping going off during your tuckpointing job…
If there is a peace symbol mortared on the side of your house when the workers leave…
residental construction and weep holes are misunderstood in my opinion.
You rarely see them in home before 1980.
The advent of home sciences and tight building construction and weep holes are still misunderstood today.
I see more efflorescence from weep holes in brick veneer walls and window lintels.
I will get some pics this winter.
I see little need for weep holes myself.
It is up to the architect and engineer design.
JMO.
This is from today’s job.
Coincidently the replacement Windows drain directly over weep holes and water enters the wall.
Interior of the wall smells like a cat litter box.
This is a building code requirement here. Must have weep holes above and below window openings. After our last big flood, I have been finding water intrusion issues into weep holes rather than water coming out.
“but the holes are under the window ledge!”
Nobody told them that water does not necessarily flow downhill!
David I see no weeps in your picture and simply having weep holes does not mean the is a moisture barrier behind.
Do you have any better pictures?
:):):):)
I have open walls for 30 plus years now.
From the interior for renovation or the exterior for veneer works.
Weeping holes on the windows are not a practical solution for the intended result.
Loading. Live loading of weather enters any space wide enough.
A hair break bond in masonry bedding will accept water.
Under, over, beside, on top, in the exterior envelope.
Live loads, wind and weather will penetrate openings.
A wall is a bloody sail catching wind but the home does not move.
It remains stationary.
Nice IR shot.
AT night or fist thing in the morning?
When the temperature of the exterior is cooler than the interior?
What IR camera?
Actually high noon, indoor outdoor temps the same!
Flir T-400
Bob, There are holes under the window ledge (just didn’t want to load that big pictures.
I post others later if you want.
I’m busy with a 20,000 sf HI proposal right now.
Holes are great with flashing…imo.
Not sure it is much different from parapet wall coping.
Temp is the same.
I will look at the Camera.
Thanks.
Doing research on IR.
Good luck with your proposal.
Brick veneer walls, if correctly installed, provide the best protection from rain penetration. http://www.capbrick.com/proper_brick_construction.htm
In order to properly drain any water collected on the flashing, weeps are required immediately above the flashing at all locations.
http://www.gobrick.com/Portals/25/docs/Technical%20Notes/TN7.pdf
Claude I have never seen flashing installed on foundation bick shelf except for commercial applications and high end homes.
Mostly airtight units.
I agree with the theory and practicality of the flashing’s,( the lest understood of all capillary and wind breaks), its the weep hole insert design that must be improved upon.
Like a VDB a one way exhaust system.
Maybe there are but I have yet to observer them visually.
Nice links Claude.
(Brick Veneer)Any building constructed since 1970 should have rubber, plastic or metallic “flashing,” a protective skirt that curves around joints to protect against moisture. When water does get through a wall, it collects on the flashing and is released through “weep holes,” small openings in the masonry. These holes are most obvious at the top of the foundation wall.
3/16-inch-diameter weep holes every 33 inches at minimum, just above the flashing . Flashing, in turn, is recommended under the first course of masonry at ground level, above windows and doors, below window sills, and at any lintels and shelf angles
masonry units names and other references.
http://free-ed.net/free-ed/Resources/Trades/carpentry/Building01/default.asp?iNum=0704
weep hole pattens.
http://www.google.com/patents?id=ez9hAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false
Weep holes get clogged with mortar.
When you comb your furrows the excess mortar spills backwards and falls on the shelf.
New materials used to create a pathway.
http://www.google.com/imgres?q=why+weep+holes+get+blocked+with+masons+mortar&hl=en&sa=X&biw=1920&bih=971&tbm=isch&tbnid=eqyJ1fNLURdQJM:&imgrefurl=http://www.aecinfo.com/1/pdcnewsitem/01/41/35/index_1.html&docid=6qnHDfCe4QA9OM&imgurl=http://www.aecinfo.com/1/pdcnewsitem/01/41/35/mortarnet.jpg&w=184&h=200&ei=BbSDT4TADc34ggflodHHBw&zoom=1&iact=hc&vpx=1715&vpy=495&dur=3621&hovh=160&hovw=147&tx=73&ty=84&sig=106655171459031883880&page=1&tbnh=149&tbnw=136&start=0&ndsp=48&ved=1t:429,r:29,s:0,i:134
Now the mud flies when you are doing 12 to 1400 a day. Lots drops in between the hollow space. By By weep holes.
Look at where most brickies drop the excess masonry. In the back void.
I understand that buildup is called snot according to Will .
http://www.gobrick.com/Portals/25/docs/Builders/NAHBRC_Moisture.pdf
Exec. Summary: This year-long field moisture study, which appends previous research conducted in 2008, examined the moisture performance of a brick wall assembly relative to seven other common wall assemblies. While the study focuses on the performance of the brick wall system, graphical results are included for all 8 wall assemblies and comparative results are presented as appropriate.
Claude.
The study was done under prefect conditions on southern facing walls.
Residential building walls were monitored for construction practices also.
Only southerly exposed and monitored.
If you look at the walled structure with the 4 different application of veneer facade it missing so many elements of real building condition.
Wall openings being one.Wall penetrations being another.
Eave overhang to wind sheer.
Through in planting, large shrubs and trees, window installations, improper building practices and we have a more legitimized study in my opinion.
Text book is OK for theory and applied application analyses.
IE: Job oversight conditions applied.
The job was monitored for the prefect conditions.
Text applied, by the book, building habits to manufactured material installations.
80% of buildings ( I say higher) are not built this way.
Figure 1: South-facing walls of test structures (building 1 right, building 2 left) … 10
Figure 2: Interior face of one wall showing dosing tubes, … 11
Figure 3. Wireless temperature, humidity, and wood moisture sensor … 15
Figure 4. Sensor placement and wall framing … 16
Figure 5. Hourly solar radiation on vertical wall surfaces … 17
Figure 6. Monthly average stud moisture content, southern exposure … 18
Figure 7. Monthly average stud moisture content, northern exposure … 18
Figure 8. Weekly average sheathing moisture content on south-facing wall … 19
Figure 9. Weekly average sheathing moisture content on north-facing wall … 20
Figure 10. Monthly averaging all sensors temperature south … 20
Figure 11. Monthly average stud bay temperatures … 21
Figure 12. Relative Humidity south monthly averaging all sensors … 22
Figure 13. Monthly Average Stud Bay Relative Humidity … 22
Figure 14. North wall moisture response, August 2009 bulk water injections … 24
Figure 15. South wall moisture response, August 2009 bulk water injections …
- Southern facing walls.
Southern exposures get the morning sun. - Closed tubs. The best of the venting mediums if they are talking about tub venting. They have a 45% beveled face. Could be wrong on the %degree of the bevel.
The bevel blocks a high percentage of wind sheer conditional weather, blown in weather, and moisture from gravity (downward flowing) water runoff from entering the walled cavity tubing. - Wireless sensors. Gees I forget to install them when I built my last , well what am I saying, I never installed them. Cigaret butts and masonry ozz that feel into the cavity got trapped between the exterior and interior walled surfaces. . Gees the oversight observers (white hats that can be paid to look the other way) are also-not on residential jobs in my area. The RBQ or CCQ.
- Sensor placement. Under study conditions to draw a theory or start hypothesizing on method, condition, placement,fora characteristic research study on brick veneer venting and placement habits are a little bias in my opinion.
I applaud the study but find it too controlled for real world conditions.
That is great never the less.
Lets see if it is maintained as a real study for xx number of years Claude.
Thanks for the link.
Hope all is well C.
Well similar studies have been completed. Here’s an example - http://www.nrc-cnrc.gc.ca/eng/ibp/irc/cbd/building-digest-40.html from 1963.
A few notable quotes:
“Rain penetration of building walls occurs all too frequently despite advances in building technology. Through-wall or complete penetration may damage building contents as well as cause stains and deterioration of interior finishes; uncontrolled partial penetration, which is less frequently recognized, can permit undesirable quantities of water within the wall.”
“It is not conceivable that a building designer can prevent the exterior surface of a wall from getting wet nor that he can guarantee that no openings will develop to permit the passage of water.”
“The advantages inherent in designs based on the open rain screen principle go far beyond those associated with rain penetration control.”
Thanks for the link Claude.