es ▁the ▁user ▁of ▁mechanical ▁resistance ▁and ▁strength ▁of ▁the ▁structure . ▁It ▁is ▁a ▁label ▁given ▁by ▁European ▁community ▁emp ower ed ▁authorities ▁for ▁end - to - end ▁process ▁master ing ▁and ▁trace ability . ▁ ▁All ▁manufact uring ▁operations ▁are ▁being ▁monitor ed ▁and ▁recorded : ▁ ▁Supp liers ▁have ▁to ▁be ▁known ▁and ▁cert ified , ▁ ▁Raw ▁materials ▁and ▁goods ▁being ▁s our ced ▁are ▁to ▁be ▁recorded ▁by ▁batch ▁used , ▁ ▁Element ary ▁products ▁are ▁recorded ▁and ▁their ▁quality ▁is ▁monitor ed , ▁ ▁Assembly ▁quality ▁is ▁managed ▁and ▁ass essed ▁on ▁a ▁step ▁by ▁step ▁basis , ▁ ▁When ▁a ▁mod ular ▁unit ▁is ▁finished , ▁a ▁whole ▁set ▁of ▁tests ▁are ▁performed ▁and ▁if ▁quality ▁standards ▁are ▁met , ▁a ▁unique ▁number ▁and ▁EC ▁stamp ▁is ▁attached ▁to ▁and ▁on ▁the ▁unit . ▁ ▁This ▁ID ▁and ▁all ▁the ▁details ▁are ▁recorded ▁in ▁a ▁database , ▁At ▁any ▁time , ▁the ▁producer ▁has ▁to ▁be ▁able ▁to ▁answer ▁and ▁provide ▁all ▁the ▁information ▁from ▁each ▁step ▁of ▁the ▁production ▁of ▁a ▁single ▁unit , ▁The ▁EC ▁cert ification ▁gu ar ant ies ▁standards ▁in ▁terms ▁of ▁dur ability , ▁resistance ▁against ▁wind ▁and ▁earth qu akes . ▁ ▁Sur faces ▁and ▁finish es ▁Mod ular ▁buildings ▁can ▁be ▁assemble d ▁on ▁top ▁of ▁multiple ▁foundation ▁surfaces , ▁such ▁as ▁a ▁craw l ▁space , ▁st il ts ▁( for ▁areas ▁that ▁are ▁pr one ▁to ▁flo oding ), ▁full ▁bas ements ▁or ▁standard ▁sl