Why do house brick walls have missing grout in some courses?
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Answers:
If you see somewhat consistent spacing and placement of these spots, it could be the weep vents. in some places they install weep vents or just empty joints. Its done on purpose to allow water from within the wall to escape. It helps the wall last longer. Its illustrated with a professional diagram of cross section of walls, and explained in this great webpage :
http://www.bia.org/html/frmset_thnt.htm...
then click on :
Water Penetration Resistance - Design and Detailing
7A [Dec. 2005]
If the missing spots are only in one patch and more random, including horizontal ones, then it could be mortar falling out. Thats not necessarily a bad thing either, because if you had mortar thats too stiff, then the mortar would survive and the bricks would chip or face would peel away.
Fill in any missing spots with type-N mortar, or "lime mortar 116", AS LONG AS you're not blocking any intentional mortar "weep"-vents.
wtf kind of question is that
The grout was either not mixed right and has chipped away or chipped away due to age, weather conditions, etc.
Because grout gets worn off over time by wind and rain, etc. When that happens the wall needs to be "tuckpointed" Which is basically grinding down the old grout and filling it with new grout.
Because they didn't do a very good job. If you mean the grout that is poured into a wall: If the grout is too dry, or they don't use a vibrator when pouring, or the rebar is too tight to allow grout to pass through.
If you mean the grout between the brick: this is because it often gets chipped out if it has been grouted after the wall's been built. This is why the preferred method is lay the brick then finish the joints with the mortar that is squished out. Grouting the joints afterwards is still down with fake brick and tile though.
its mortar between the brick, and its just due to weathering and freeze thaw cycles. grind the bad joints out and point with fresh mortar...its mortar between brick and grout between tile...
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