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Remodeling Contractor
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This should not be sealed. A clear airspace must be maintained behind the brick to vent moisture. Brick and their joints are not waterproof. However your wall seems to not be completely correct. At the bottom weep holes are left between the brick joints but are filled with a screen to prevent bugs. These may get clogged with spider webs which is one reason your builder left these open. I would suggest leaving it alone.
 

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Remodeling Contractor
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3,590 Posts
Could you post a picture? The gap at a window ledge or floor transition is sealed with caulking, not left open. Only gaps needed is what you see at the lower level (usually about the third row up from the bottom) and every third brick is about right. It is moisture that is being removed by air flow, not a wet condition. If a gap exists above any brick, excessive moisture will get into the wall. Gaps are left so they can be caulked, since the wood wall and bricks move at very different rates and these joist would otherwise crack. A foam backer rod and caulking is used. Be sure to clean first and tool joint with a back of a spoon.
 
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