Quote Originally Posted by travajante View Post
Check w/ Sika, they've a number of options. Crack Isolation Membrane(viscous liquid form), & Cementitious waterproofing among them. Unlike pool conditions where concrete won't be dehydrated nor be subjected to constant significant thermal fluctualtions due to them holding water, firewalls will require periodic attention/reapplication.
Should you want a permanent solution where possible, go for longspan prepainted roof sheets installed vertically onto your firewall. Make sure to overlay a good flashing layer to cover the area where the wall meets the roof.

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Is there an aesthetically better way of permanently waterproofing walls?