How to Insulate a Crawl Space

Posted by Wattson on Feb 4, 2022

how to insulate a crawl space energy monster worcester massIf you’re like most homeowners, you probably don’t think about your crawl space very often. But did you know that insulating your crawl space can have a lot of benefits? Not only does it help keep your home warm in the winter and cool in the summer, but it can also increase your home’s value and improve air quality. We’ll tell you why insulating your crawl space is so important and how to go about doing it.

The Benefits of Insulating a Crawl Space

There are a number of reasons why insulating your crawl space is a good idea. For one, it can help keep your home warm in the winter and cool in the summer. In addition, adding insulation to your crawl space can increase your home’s insulation value by up to R-30. This means that you will be able to save on energy costs each month.

Another benefit of insulating your crawl space is that it can improve air quality. By insulating the space between your floor and the ground, you are trapping fewer pollutants and allergens inside. This can be especially beneficial for people who suffer from allergies or asthma.

Should you insulate your crawl space?

If you are on the fence about whether or not you should insulate your crawl space, here are a few things to consider:

  • Does your home experience extreme temperatures (either very hot or very cold)? Insulating your crawl space can help keep it more comfortable.
  • Have you checked your home’s insulation? If your home has poor insulation, adding insulation to your crawl space can make up for some of the deficiencies.
  • Do you have allergies or asthma? If so, insulating your crawl space may help improve air quality.

Best Types of Insulation to Use in a Crawl Space

There are a few different types of insulation that can be used in a crawl space. The most popular options are fiberglass batts and cellulose. Fiberglass insulation is made up of tiny glass fibers, while cellulose is made from recycled paper products. You can also consider closed-cell spray foam insulation, but spray foam should be installed by a professional if you use it in your crawl spaces. Cellulose and fiberglass batts can typically be installed DIY, but a professional can also help. All of these insulations are effective at trapping air, acting as a vapor barrier, and preventing heat transfer.

The best option for crawl space insulation is rigid board insulation. Rigid foam insulation is made from polystyrene, and it can be installed directly on the crawl space walls. It is effective at trapping air and preventing heat transfer, and it also helps to reduce noise levels. It may have a foil back that faces the inside of your crawl space. The foil is an added benefit for energy efficiency by reflecting the heat back into your crawl space and providing a vapor barrier.

Installing Insulation in a Crawl Space

The process of installing insulation will be determined by the type of floor insulation you choose. We will discuss rigid foam insulation since it is the insulation of choice for your crawl spaces. If you choose spray foam insulation, closed-cell or open-cell spray foam, it should be installed by a professional because if it is done incorrectly, it can cost you tons of money and be bad for your health.

You’ll want to make sure any ventilation to your crawl space area is sealed off with caulk to prevent airflow. Sealing crawl space vents keeps warm air in, cold air out, and your floors warmer during cold months. During the summer months, it does the opposite and keeps your floors cooler and your air conditioner from working too hard. This is what makes rigid insulation so energy-efficient.

#1 Check for areas where moisture can enter

Do an inspection of your crawl space to see any vulnerable areas where water can seep in. Moisture control is key for maintaining your crawlspace insulation for years to come. Shovel the soil that is against the outside of your house to create a way for water to flow away from the building. Redirect spouts that can allow water to run along the foundation wall of your home.

#2 Look for interior moisture buildup sources

Check for vulnerable areas under your home where water can also get in. Be sure to check areas that typically would have moisture such as the bathroom, dishwater, or sinks. This is an easy task and all you need is a flashlight to inspect crawlspace walls and ceiling. Shine your flashlight and look for key signs of water, paying close attention to plumbing pipes that run through or within your floor joists.

#3 Seal crawl space vents and doors

Take a look around the outside of your home and seal vents, doors, or openings that go into your crawl space. Seal these areas with exterior grade caulk in cracks and holes.

#4 Seal rim joists and sills

This will need to be done during the day when there is plenty of sunshine. You will need your flashlight as well if you don’t have good lighting in your crawl space. Examine the rim joists and sills for any light shining through. Seal these areas with silicone caulk.

#5 Insulate foundation walls

For this part of the project, you will need a latex adhesive, rigid foam board, and a saw. Measure and cut the rigid board to fix inside the crawl space walls and attach with the adhesive. Use large sheets of foam board to get as few seams as possible. Seal all of the seams with PVC tape.

#6 Cover the floor with a vapor barrier

A plastic vapor barrier will be laid across the entirety of the crawl space floor. If you have any posts in your crawl space, cut the material so it fits around it and seal these areas tightly with butyl tape. Run the vapor barrier about 12 inches up the insulated wall and tape the edges to the insulation to create an air-tight seal. With the vapor barrier installed, you can enjoy an insulated crawl space that can help keep your home comfortable all year round.

Who can help me insulate my crawl space?

If you’re not sure what materials you need or how to properly insulate your space, don’t sweat it. Our team of experts at Energy Monster can help you insulate your crawl space in a timely fashion and at a great price. We are here to answer your questions and provide a free assessment! Give us a call today. (855) 627-7674

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