0 We Fix It Professional Portsmouth, VA on May 31, 2011 Like Clip I have 1/4" cracks running the height of my garage walls. Should I plaster or would the spray insulation be suffienct? 1 Comment John H Clermont, FL We fix it, I would seal the cracks with a elastomeric caulk first. Then you can plaster or use the spray insulation. The elastomeric caulk will make a nice seal. It will also expand and contract with the weather or temperatures. NOTE: You can drag and drop your photos to reorder them Required Comment Saving...
I would seal the cracks with a elastomeric caulk first. Then you can plaster or use the spray insulation. The elastomeric caulk will make a nice seal. It will also expand and contract with the weather or temperatures.