The Foam Works Perfectly When The Cracks are Sealed, The Width of Which Is at Least 1 Cm and Does Not Excel 8 CM. IF Itsessary to Carry Out Work with A Larger Defect, The It Makes Sense to First Fill Its The Material Cheaper (Brick, Wood, Foam, Plastic). And in the Case of a Defect of Less than 1 CM, You can usa Sealants or Putty.