How to Insulate Under a Mobile Home Floor

Lead Image
  • 3-6 hours
  • Intermediate
  • 50-100
What You'll Need
Staples or tacks
Staple gun
Silicone sealant
Duct tape

Insulating under a mobile home floor optimizes heating and cooling ventilation, which will save you money on energy costs long-term. While you can call a carpenter to do the job for you, this is a project that can also be done by a savvy DIYer. Simply gather the necessary tools and materials and read the following guide to insulate under your mobile home's floor.

Step 1 - Inspection of Trailer Flooring

The underside of the mobile home should be inspected for damage on the flooring such as holes and/or water build-up. Any damage should be repaired before installing the insulation. If there is existing insulation, it must be removed. Fill the holes with insulation stuffing or wood cutouts to seal the holes. If there water has accumulated, it must be dried completely to eliminate mold growth. Insulation can then be installed.

Step 2 - Preparation Prior to Installation

Create as much space as possible for the installation. Disengage any plumbing connections. Insulators will be positioned over the plumbing and wiring. It is important to switch off the electric and water supply to avoid electrocution.

Step 3 - Purchase of the Insulator

Purchase a roll of insulation with sufficient R-value, which is the measure by which insulation is graded. The insulator should be placed at the floor joists on the underside of the home trailer. Start from the front of the main beams and work toward the end of the trailer.

Step 4 - Installation of Insulators

Begin by the ends of the first and second joists. The paper backing should be turned down. Secure the backing by stapling the ends to the wood frame of the home trailer. Secure the other side by stapling it. Attach wires to further support the insulation to each joist. Do the same procedure on the rest of the pieces of insulation

Step 5 - Reconnect Plumbing and Wirings

The plumbing and wiring connections that were previously disengaged should be attached already. Use silicone sealants to close the plumbing lines. Any plumbing and ductwork should be insulated with wrapping insulators. The insulation should be covered after with duct tape.

Step 6 - Covering the Insulation

Cover the insulation with fabric. Fasten the fabric onto the wood frame the same way the insulation was fastened. Plastic fabric may be used to reduce condensation. Either fabric will prevent cold drafts from seeping through the insulation.