Check for building material increase (13)
I believe the answer is:
reinforcement
'increase' is the definition.
(thesaurus)
'check for building material' is the wordplay.
'check' becomes 'rein' (both can mean to control or limit).
'building material' becomes 'cement' (cement is a kind of building material).
'rein'+'for'+'cement'='REINFORCEMENT'
(Other definitions for reinforcement that I've seen before include "supporting structure" , "Augmentation" , "Strengthening" , "Back-up" , "additional support" .)