Crawlspace Encapsulation

Encapsulating a crawlspace is a great way to improve energy efficiency, indoor air quality, and moisture control in a home. Here’s what you should know:

Benefits of Crawlspace Encapsulation for Energy Efficiency

1. Reduces Energy Loss

   • Unsealed crawlspaces allow outside air to enter, forcing HVAC systems to work harder. Encapsulation helps maintain a stable temperature, reducing heating and cooling costs.

2. Improves Insulation Performance

   • By sealing off the crawlspace, insulation stays dry and effective, preventing energy loss due to damp or compacted insulation.

3. Minimizes Air Leaks

   • Air leaks from the crawlspace can create drafts in the home. Sealing these leaks improves overall efficiency.

4. Reduces HVAC Load

   • By controlling humidity and temperature fluctuations, the HVAC system runs more efficiently and lasts longer.

5. Prevents Mold & Structural Damage

   • Excess moisture leads to mold and wood rot, which can impact structural integrity and cause costly repairs.

Steps to Encapsulate a Crawlspace

1. Seal Vents & Gaps

   • Close and seal all external vents and air leaks to prevent outside air from entering.

2. Install a Vapor Barrier

   • Cover the crawlspace floor with a thick plastic vapor barrier (usually 10 polyethylene) to block moisture. This plastic sheeting will go one foot up your crawlspace walls, with you wall insulation going over it to ensure a tight seal. 

3. Insulate Walls & Rim Joists

   • Use vinyl insulation or spray foam insulation on crawlspace walls. Fiberglass batts or spray foam should be used around rim joists to improve thermal performance.

Cost & ROI

• Initial costs range from $3,000 to $15,000, depending on size and materials.

• Energy savings can range from 15% to 25% on heating and cooling costs annually.

• Long-term benefits include improved home value, fewer HVAC repairs, and better indoor air quality.