Recently we were asked to take a look at a crawl space that smelled a little musty. During our review of the crawl space we determined a few problems:
1. Some of the joist batt insulation had fallen down
2. Some of the joist batt insulation was installed backwards
3. A few pieces of the rim insulation had fallen out
4. The min. of 6-mil (or higher) polyethylene sheathing to cover the ground was missing
5. Fungus was growing on the floor joists
Here are some steps to take to rectify the problem:
Step 1

Step 2
Install the batt insulation. Insulation with a vapor retarder should be used. Pay attention so that the vapor retarder faces up towards the heated area of the home. The insulation should be installed tight up against the subfloor. The insulation should stay temporarily in place. Once the insulation is in place, hold it in position with insulation support wires. Make sure the ends of the batts fit snug up against the band joists.
Step 3
Infill the missing rim insulation where need. You can use the same vapor retardant faced insulation as in Step 2.
Step 4
Cover the ground with black min. 6-mil polyethylene sheeting,overlapping joints by 12" or more. Then use duct tape to join the overlaps and or use rocks to hold the material in place. This will prevent ground moisture from entering the space, rising to the flooring above and causing fungus, mold or wood rot. The polyethylene sheet makes a great moisture barrier.
You trusted handyman Handy Andy
Visit us at www.HandyPro.comSeptember 2013