Advantages of using a vapor barrier

This vapor barrier is very helpful in keeping moisture away from the basement walls and the rest of the house. It’s nothing more than a plastic sheet but the difference is always made by the way of installing it. If you install it in crawlspaces, you will keep all these areas dry and in the same time the first floor of your house will be safe.

How to measure the crawlspace

There are some major differences between a basement and a crawlspace. The second one is made out of an earth floor and the ceiling is not so high. Because of these facts, moisture can easily accumulate, so you need to have an exact measurement of the crawlspace in order to keep it dry. Using a tape measure for the distance, you will get a much better result than just combining the length and width. This way you will find out how much material you will need.

How to add a layer of mastic

A layer of asphalt mastic has its role in this project because you will need something for the barrier to bond with and create a watertight seal. Use the mastic in a crawlspace and let it dry. You can start adding the barrier when you feel that the mastic is tacky to the touch.

How to install the vapor barrier

When you add the barrier, you have to find the perfect spot for it into the mastic and fold it around every corner. You will need to make some cuts for different constructions like support pillars. In the end, you will need to have at least 6 inches and a foot of material for every end and smoothed up the wall. Either mastic or caulking can be used in order to keep these ends fixed. In case of caulk, you need to have 100% silicone for better protection against moisture.

How to finish the installation

The plastic used for the crawlspace should cover it completely and the barrier created needs to include all the walls. The moisture can be better prevented if all the edges of the barrier will be taped together. This can be done also with caulk and it needs to cover the entire crawlspace. In the end, an extra layer of caulk is necessary especially for the places where the sheets touch the wall. After the caulk is dried, you can say that your job is done.

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