Controlling moisture under your Virginia home is critical for preventing mold, rot, and structural damage. A properly installed vapor barrier keeps wet crawl space air from seeping into your living space. Follow these tips for under house vapor barrier installation in Virginia's humid climate.

Choose the Right Materials for Your Under House Vapor Barrier Installation in Virginia

Select a vapor barrier product rated for under-house use. Look for a material that blocks moisture but allows some airflow. Polyethylene plastic sheeting at least six mils thick is a common choice.

Mind the Seams

Seal all seams thoroughly with adhesive, mastic, or polyethylene tape to prevent moisture infiltration. Overlap sheets by 12 inches and seal the overlaps. Run the vapor barrier 6-12 inches up stem walls and seal to sill plates with adhesive.

Address Penetrations

Cut barrier material tightly around all penetrations like pipes, ducts, and wires. Then, seal the edges with caulk or mastic. Foam gaskets can seal penetrations while allowing some movement. Properly sealing penetrations prevents moist air from sneaking through.

Include a Retainment Strip

Install a retainment strip around the base of stem walls to hold the vapor barrier in place. Use rigid foam board or treated lumber. Secure the strip to the wall with concrete fasteners and seal the vapor barrier to the top edge with adhesive.

Slope Away from the House

This is one of the important tips for under house vapor barrier installation in Virginia.Before installing the barrier, ensure the ground is sloped away from the foundation walls. Use crushed stone or gravel to improve drainage if needed. Adequate sloping and drainage reduces moisture buildup under the house.

Seal All Edges

Run vapor barrier up stem walls and seal top edges with fasteners and acoustical sealant. Also, seal seams between the barrier and foundation footing. This locks the living space from the crawl space.

Inspect and Repair

Inspect vapor barriers annually before the wet season. Look for loose edges, rips, moisture accumulation, or failed seams and seal them up. This prevents costly moisture damage in walls and wood over time.

Seek the Expert Help

When installing an under-house vapor barrier in Virginia, working with an experienced local company is essential. Many vapor barrier companies in Virginia can provide quality products and proper installation of vapor barriers. Look for an established company that is licensed, bonded, and insured. Reputable vapor barrier companies will assess your home and recommend appropriate materials. They will also provide any necessary repairs or maintenance down the road.

In Summary

Installing an effective vapor barrier in your Virginia crawlspace takes some work. But it pays off through lower energy bills, reduced humidity, and prevention of structural issues. Follow these tips to maximize your vapor barrier's performance. Contact local vapor barrier companies for products and professional installation.