Hi Elvis…
I am sorry if you think the next bit is Harsh…
But your question of all shops closed for a month is really rather Stupid….
I live In Tarragona and I can assure you Everything is Open Unless there is a melt down or Public holiday even then some shops are still open!
All shops are open @ normal times…. Except for Fiestas or Bank holiday and yeap each town has there own holiday.
Tarragona Industrial Estate Were all the Big Retail Shops including Builders yards will be open normal times…
If your lucky and Go there in the middle of august and you have kids I recommend you take them to the Renault garage as next to the Garage there will be a Circus that World famous (No Animal Circus)
Good luck on your building project
Mac…