Measuring for vapor barrier:
- Measure your perimeter walls. Most crawls will require 4ï¿½ rolls around the perimeter. Remember to leave a 3-6ï¿½ space at the top of the wall for termite inspection, and 12ï¿½ overlap for any seams. Tall crawls may need two 4ï¿½ widths or a 12ï¿½ width roll.
- Measure your square footage. Remember you will want a 12ï¿½ overlap for any seams. Order whatever combination of rolls you need. You may want a little extra for corrections and repairs.
* It is a good idea to make a sketch of your crawl space. This will help you in ordering both the correct size vapor barrier rolls and the tape you will need. Donï¿½t forget to factor in piers, support walls and any other obstructions. A good plan will save you time and money. All rolls are shipped on a 4ï¿½ spool. The 12ï¿½ width is tri-folded and shipped on a 4ï¿½ spool for easier handling.