▁and ▁are ▁imm une ▁to ▁both ▁compression ▁shr inking ▁and ▁cold ▁brid ging . ▁Mod ular ▁units ▁may ▁also ▁be ▁designed ▁to ▁fit ▁in ▁with ▁external ▁a est het ics ▁of ▁any ▁existing ▁building ▁and ▁mod ular ▁units ▁once ▁assemble d ▁can ▁be ▁virt ually ▁ind ist ingu ish able ▁from ▁a ▁site - built ▁structure . ▁ ▁Im pro ved ▁Air ▁Qu ality ▁– ▁Many ▁of ▁the ▁ind oor ▁air ▁quality ▁issues ▁identified ▁in ▁new ▁construction ▁result ▁from ▁high ▁mo ist ure ▁levels ▁in ▁the ▁fr aming ▁materials . ▁Because ▁the ▁mod ular ▁structure ▁is ▁substantial ly ▁completed ▁in ▁a ▁factory - control led ▁setting ▁using ▁dry ▁materials , ▁the ▁potential ▁for ▁high ▁levels ▁of ▁mo ist ure ▁being ▁tra pped ▁in ▁the ▁new ▁construction ▁is ▁elimin ated . ▁ ▁Mod ular ▁buildings ▁can ▁also ▁contribute ▁to ▁LE ED ▁requirements ▁in ▁any ▁category ▁site - built ▁construction ▁can , ▁and ▁can ▁even ▁provide ▁an ▁advantage ▁in ▁the ▁areas ▁of ▁S ust ain able ▁S ites , ▁Energy ▁and ▁At mos phere , ▁Material s ▁and ▁Resources , ▁and ▁Ind oor ▁Environment al ▁Qu ality . ▁Mod ular ▁construction ▁can ▁also ▁provide ▁an ▁advantage ▁in ▁similar ▁categories ▁in ▁the ▁International ▁Green ▁Const ruction ▁Code . ▁ ▁Dis adv antages ▁Vol um et ric : ▁Transport ing ▁the ▁completed ▁mod ular ▁building ▁sections ▁take ▁up ▁a ▁lot ▁of ▁space . ▁ ▁F lex ibility : ▁Due ▁to ▁transport ▁and ▁sometimes ▁manufact uring ▁restrictions , ▁module ▁size ▁can ▁be ▁limited , ▁affect ing ▁room ▁sizes