How to Insulate between a Garage Ceiling and an Attic Floor

What You'll Need
Safety Gloves
Dust mask
Craft Knife
Tape Measure

If you have an attic floor right above your garage ceiling, then you may be concerned about the amount of cold air that is transferred between these two spaces. Adding a layer of insulation to the garage ceiling can help you to prevent cold air from getting into your home and will also help you to save money. You may encounter problems when it comes to properly venting your garage and your attic. Make sure that your garage ceiling has a proper ventilation box and the attic has gable vents and fans.

Step 1 - Prepare the Attic and Garage

Make sure that your spaces are properly prepared before you start to add insulation. You can do this by adding vents to your attic. Do not add the insulating fabric until you are sure that both of the rooms are properly ventilated. Poor ventilation will carry the risk of passing fumes from the garage into your home and allowing mold to grow in the attic space. If you have any doubts consult an insulation specialist.

Step 2 - Get the Insulation

Measure the space above your garage ceiling so that you know how much insulation you will need to cover the space. You will need to get the right insulation for the job. There are a number of different types of insulation with varying degrees of qualities and prices. You need to get the right batt (the unit of insulation) for your job. Again, if you are not sure, you should ask the sales people about the right amount to insulate your garage ceiling. Usually, a 30 batt should be good enough. Make sure that your insulation is also marked as fire resistant in order to comply with local building regulations.

Step 3 - Lay the Insulation

Take the insulation up to your attic so that you are above the garage ceiling. Take up the floor allowing you to  see the joists. You should have a vapor barrier between the insulation and the ceiling of your garage. This is particularly imnportant if you have heating and air in the garage. For example, heating and air can come from clothes driers. Lay down the insulation between the joists. Take care to ensure that it is not close to the edges of the roof. This will prevent the insulation from touching the damp walls and is important because it can seriously affect the insulating material.

Step 4 - Finishing

Once the insulation has been laid, you can then finish it off by taping down the edges to keep them secure. Make sure that you don't trap moisture beneath the edges because can cause problems, such as mold. Once you have finished laying the floor, replace the boards in your attic.