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How to Insulate Under a Mobile Home Floor


by DoItYourself Staff

what you'll need

  • Flashlight
  • Insulation
  • Staples or tacks
  • Staple gun
  • Silicone sealant
  • Duct tape

It is appropriate to set-up insulation underneath a mobile home floor to be able to get good heating and cooling ventilation. The insulation will likewise act as a protection of the flooring underneath. Below are the materials that you need along with the instructions on how to insulate under a mobile home floor.

Step 1 - Inspection of Trailer Flooring

The underside of the mobile home should be inspected using a flashlight to check for damages on the flooring such as holes or any water build-up. If there are any damages found, these should be repaired prior to the installation of the insulation. If there is an existing insulation, this must be taken out. The remedy for the holes is to fill these with insulation stuffing or wood cutouts to seal the holes. If there is build-up of water, this must be dried completely to eliminate growth of molds. Insulation then could be installed.

Step 2 - Preparation Prior to Installation

Create as much space as possible for the installation work. Disengage any plumbing connections. Installation of insulators will be positioned right on top where plumbing and wirings has been put. It is important to switch off electric and water supply prior to the insulation for protection against electrocution.

Step 3 - Purchasing the Insulator

Purchase a roll of insulation with enough “R” value because this contains the highest grade needed for the insulator to maintain heat and function well. The insulator should be placed amid the floor joists at the underside of the home trailer. Installation should start from the front of the main beams and work your way towards the end of the trailer.

Step 4 - Installation of Insulators

Begin the installation of the insulator by the ends on whichever on the first and second joist. The paper backing should be turned down. Secure the backing by stapling the ends to the wood frame of the home trailer. Slip in the insulators amid the floor joists while continuing to work on the other side. Secure the other side by stapling it as what was done previously. Attach wires to further support the insulation to each joist on the flooring so that it is held securely in place. 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 up plumbing lines. Any plumbing and duct work should be insulated by covering it with wrapping insulators. The insulation should be covered after with duct tape.

Step 6 - Covering the Insulation

Cover the insulation with a fabric. Fasten the fabric onto the wood frame the same way the insulation was fastened. Plastic fabric may be used which is aimed at reducing condensation. Either fabric will prevent cold draft into seeping through the insulation. You have just learned how to insulate under a mobile home floor.

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