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Brick Water Repellant

Brick sealant 511 

You need a water repelling product that soaks into the brick.  The repels rain water but still allows the brick to breath to let out water vapor to allow drying.

http://www.miraclesealants.com/s_511_impregnator.html

Available for about $23 per quart from:

http://www.homedepot.com/h_d1/N-5yc1vZ1xh8/R-100041465/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053 

511 Impregnator is the original penetrating sealer designed for the protection of all medium to dense porous surfaces. 511 Impregnator forms an invisible barrier that is resistant to moisture and stains while allowing vapor to escape.