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There's a few bricks around my house about 40cm up from ground level where the vertical mortar between the bricks has completely fallen out / eroded away.

In a few spots, there's insects going into it and making a home.

I think I should fill it in, but I'm not sure of the best way to do it.

Mix up some mortar? Just use caulking?

I'm in SWO, Canada, so whatever I do has to be weather resilient.

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As noted, if they are weep holes, you likely don't want to fill them in. Otherwise, what you are wanting to do is called 'tuck pointing' and there are several ways to do it. Googling it should turn up some tutorials/videos for you. –  DA01 Aug 1 '12 at 17:22
    
You can get pointing compound in a tube like caulk. Much easier to use. –  Chris Cudmore Aug 1 '12 at 17:30

2 Answers 2

up vote 7 down vote accepted

Is it the bottom row of bricks, and are they regularly spaced? (I guess that's only possible if your foundation comes up 40cm.) Because if that's the case, they're weep holes, and shouldn't be filled in. Otherwise, I'd go with @Tester101's answer.

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Sure sounds like weep holes. If so, don't fill them! If you are worried about insects, get an insecticide or use a pest control specialist. –  Brandy Scott Aug 11 '10 at 18:50
    
you can also stuff the weep hole with a bit of steel wool. That way it still vents but makes it tougher for bugs to get in. –  DA01 Aug 1 '12 at 17:22
  • Make sure you clean the joint very well (with a stiff bristle brush) making sure you remove all dust and debris from the crack.
  • Mix up some mortar and put it in something similar to a pastry bag (the thing bakers use to decorate with). A large Zip-Lock bag with a nipped corner should work.
  • Squeeze the bag so the mortar fills the gap making sure the mortar goes as deep as possible.
  • Wipe off any excess mortar.
  • Wait for the mortar to dry slightly and then tool the joint to match existing joints.
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