i agree with travs.
we have a three-storey concrete firewall.
from the start, it would leak badly.
dad tried every waterproofing treatment in the market.
nothing worked for long.
finally, pinaku-an niya nang overlapping flat galvanized iron sheets.
ayun! after 50 years, it still don't leak.
of course, it won't win a beauty contest.
if you intend to enter a beauty contest, choose your design of metal sheet.





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