How to Add Insulation to Walls That Are Closed
Jul 27, · Facing in the Right Direction If you are installing fiberglass insulation in outside walls, pay attention to the paper facing. The facing is a vapor retarder, meant to slow the migration of water vapor through the wall. If warm, moist air from inside a house travels through the wall, it will condense when it hits the cold sheathing on the outside. May 01, · Gregg is renovating his year-old house in Wisconsin and trying to devise the best way of insulating exterior walls from the outside. The house was built conventionally, with 2?4 walls, fiberglass batt insulation, fiberboard sheathing, and hardboard siding. He plans to tear off both siding and sheathing and remove the batt insulation, then apply 3 in. of spray polyurethane foam insulation into the stud bays.
Insulation in house exterior walls is one of the primary defenses against heat and energy loss. So if your house was built before insulating walls became standard, you can potentially save a great deal of energy by insulating. But how do you get insulation into existing walls without opening them up? You can insulate existing exterior walls either from inside or outside the house.
When doing it from outside, the job involves removing some siding panels so that large holes can be bored through the sheathing at the top of wall stud cavities. Then installers use special equipment to blow fiberglass fibers or cellulose insulation through the holes into the cavities. Then the walls are plugged up and the siding is replaced. Blowing insulation into walls from inside the house basically involves the same procedures but, instead of removing siding, holes are cut through the drywall with a large hole saw.
Of course, this creates a serious mess indoors and requires extensive patching and painting of drywall. The following video gives you a pretty clear view of the mess and patching required. Equipment for the job can be rented at many home improvement centers.
In fact, some provide the equipment free if you buy about 20 bags of insulation. Always wear safety goggles and a mask or respirator when working with this material.
Shredded fiberglass and cellulose can be blown-in because their small particles fill in the nooks, crannies, and irregular areas of wall space quite well. With a how to insulate outside wall saw, cut a small hole between 2 and 3 inches wide between two studs and near the top of the how to insulate outside wall, and place the cut portion aside—you will reattach this later.
Repeat this step between each pair of studs. Wrap a rag around the hose how to apply shadows in photoshop it meets the wall to form how to insulate outside wall seal.
Pull the hose back as the cavity fills. Ask your helper to stop the machine when you feel resistance and can no longer insert insulation. Don Vandervort writes or edits every article at HomeTips. HomeTips articles may contain links to Amazon. Tagged batt insulation energy insulate insulating insulation rock wool.
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Blowing-In Insulation, Step-by-Step
With boric acid added for fire resistance, shredded, recycled telephone books, tax forms, and newspapers all contribute to making safe cellulose insulation. Blown-in cellulose is injected into the wall cavities by a series of holes drilled into either the inside or outside of the walls. It's not recommended to do your own blown-in wall insulation. Jan 26, · Wrap a rag around the hose where it meets the wall to form a seal. 3 While you hold onto the hose, have a friend turn on the blower. Pull the hose back as the cavity fills. Ask your helper to stop the machine when you feel resistance and can no longer insert insulation. 4 Repeat steps 2 and 3, filling up the remaining wall cavities. Most wall assemblies, especially those in older homes, are built with two-by-four (2x4) studs. Since modern two-by-fours are not 4 inches, the true depth of the wall cavity is 3 1/2 inches. In most wall applications, you will use R or R kraft-faced fiberglass insulation rolls for .
Home insulation is a crucial but intimidating project. However, it is a necessary skill for any homeowner. Insulate your exterior walls with confidence with these helpful tips. In exterior walls, kraft-faced fiberglass insulation helps control temperature and humidity inside the structure. It's important to have, no matter what weather conditions you live in, though the way you install it may vary.
A well-insulated home keeps everyone comfortable and happy. Of course, insulation also has a role in interior walls, and should not be dismissed when it comes to the rest of your home.
You may want to add it to the walls of your upstairs area to help deaden sound between rooms. Below, we'll help you understand how insulation works and how to install it yourself.
One of the worst aspects of installing fiberglass insulation is that loose particles can be extremely irritating. Protective clothing is one line of defense: long pants and sleeves, collar and cuffs buttoned.
Choose a dust mask especially designed to filter fiberglass particles. Thin leather gloves block irritants while still permitting you to handle tools easily. As soon as you've finished installation, take a shower, using cool water at first to close your pores so the fibers don't penetrate your skin.
Wash work clothes in a separate washer load, using hot water and an extended wash cycle. Another way to avoid discomfort is to select insulation that's designed to minimize itching.
One product utilizes curled fibers that are less likely to irritate, and another type sheathes the insulation in a plastic sleeve. Fiberglass insulation comes sized to fit between studs that are either 16 or 24 inches on center. You can buy it in rolls or in batts that are precut to the length of stud bays.
For sound control, the paper facing is not necessary but provides a convenient flap for stapling. If you are installing fiberglass insulation in outside walls, pay attention to the paper facing. The facing is a vapor retarder, meant to slow the migration of water vapor through the wall.
If warm, moist air from inside a house travels through the wall, it will condense when it hits the cold sheathing on the outside. If the sheathing is damp from condensation, it eventually wets the insulation, decreasing its effectiveness.
Damp sheathing also is prone to rot. If the outside air is warm and the inside air is cool, the process works in reverse, causing condensation on the drywall. If you live in a climate where you heat in the winter, place the paper toward the inside of the house. If you live where air-conditioning is used more often than heat, face the paper barrier to the outside of the wall.
To add soundproofing, weave a continuous roll of fiberglass insulation between staggered studs, using insulation designed for 2x4 walls. Weave loosely to fill the cavity but tightly enough so you won't have to compress the insulation when you install drywall.
When you reach the end of the wall, cut off the insulation. Weave additional lengths of insulation in the same manner on top of each other until the wall is filled. July 27, Save Pin FB ellipsis More. Stapling roll insulation. Comments Add Comment. Share options. Back to story Comment on this project Rate Review Comment on this story. Tell us what you think Thanks for adding your feedback. Close Login. All rights reserved. View image.