Constructing Laws Air Brick Wall Home Inventory Photos And Images Where the cavity is filled with insulation batts the mortar extrusions can compress the insulation material and any water entering the batts might observe the compression layers towards the inside leaf of the wall. Cavity trays are used to http://rylanzfkor.ivasdesign.com/20121817/getting-the-answers-for-choosing-concerns-for-subfloor-ventilation