Attic Insulation: How to Install a Vapor Barrier

With all forms of attic insulation, knowing how to install a vapor barrier can be vital. Following a few simple steps to help you undertake the task properly can be very important in terms of establishing the retention of heat without the insulation suffering damage.

Step 1 – Preparation

Begin the process of fitting a vapor barrier for attic insulation by preparing the space for the job. Remove any transferable items from the attic so that they do not get in the way as you work. If there is limited lighting, include some more so that you are able to clearly see what you are actions.

Clean the entire attic with a dust pan and brush or vacuum cleaner, either way ensuring that you get into all the corners and crevices. This will make it easier to determine whether any rectification work is necessary. Fill any cracks or holes that you find to reduce the amount of heat that can escape through these means. Take a note of the construction of the attic to figure out which type of barrier will be suitable.  

Step 2 – Measure

Installing an efficient vapor barrier for attic insulation means that you need to have the dimensions of the room. Measure the entire area and keep a note of the result to take with you when purchasing materials. Do not overlook the door that provide access to the attic.

Step 3 – Blanket Insulation

Many types of blanket attic insulation already have a vapor barrier incorporated into it and will be effective at reducing moisture problems if it is fitted correctly. Make sure that you read the instructions carefully so that you know which side is the vapor barrier and how to install it. Blanket style insulation often comes in a roll which can be cut to fit between joists before being tucked into the sides. Begin by securing the roll at one end before unfurling it and continuing to tuck it in until it is firmly in place. Wear protective clothing when installing insulation.  

Step 4 – Vapor Barrier Layer

Attic insulation how to is especially relevant for loose insulation and blanket styles that do not comprise a vapor barrier. The barrier will usually come in a roll which will make if easier to fit into place. Lay the first few inches of the barrier sheet to the base of the wall and press it into the corner where you can staple it into place.

If you are reluctant to use staples, secure the barrier with duct tape instead. Gradually roll out the barrier out and use your chosen method to secure it at regular intervals. As you work, sweep your hand across the surface to push out any air and keep the barrier flat. Cut the vapor barrier when you reach the end of the room, making sure you leave enough excess to form an edging lip.