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Weep Holes

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Sure thing Mr. T.

Another thing that might be helpful to understand, is that stone mortar is nowhere near as dense as brick mortar. Stone mortar is merely sand and Portland cement mixed just damp enough to clump when compressed. So, it's pretty porous. The exterior of the joint is rarely tooled, but is typically brushed, which does create a bit of a finish. Consequently, moisture will wick out of stonework pretty readily.

Brick mortar, on the other hand, is quite dense, due to the plasticizers (lime, etc.) The real purpose of those materials are to make the mortar much more workable. They make it so a mason can spread a trowel full of mortar along three to five bricks at once. They also make it so the mortar will easily squeeze out from between the bricks as they are installed. The plasticizers fill most of the voids between the sand and cement particles making brick mortar dense. So, brick mortar holds water for a much longer period of time.

I imagine that, a drainage system isn't quite as critical with stone veneer, but that's just a guess.

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