What can fiberglass insulation NOT touch?


Typically you want the basement insulation installed with the paper (vapor barrier) facing the heated part of the home. Moisture from inside air can condense and become trapped in the insulation during cold winter months leading to mold, especially at rim joists or skirts (paper facing outside).

However, if you will be spending a little more time in the basement, you will want to do this differently. You will most likely want to use a foam board toward the house, then turn the insulation over so that the paper is facing down toward the basement. But if you are going to finish the basement and use it as a proper living space (and finish the ceiling with drywall), then you should not insulate the ceiling at all. You'll need to insulate the walls of the basement, and buy some soundproofing foam for the ceiling.

With all that in mind, cables (wires) should be exposed if possible (keep the wires cool). But pipes are more efficient when insulated (less heat...

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I know, it's the age-old question: can fiberglass insulation burn?

Not really, but there is a caution!

There are many kinds of chimney vents - masonry and metal.

One particular type is called a "Type B vent." A Type B vent utilizes two different tubes - an interior tube which carries the heat and a surrounding tube which does not touch the interior tube.

The separation allows for the dissipation of heat so that what outer ring touches would not get too warm.

It is a safety feature. This Type B vent is used for gas appliances (furnaces and fireplaces), not solid-fuel appliances like wood or coal.

However, the International Residency Code requires a separation between the outer ring and anything it might touch inside a house.

Why? If the outer ring is cooler what could be the harm of it touching anything? And especially something that is not considered combustible, like fiberglass insulation?

From the IRC:


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Fiberglass insulation is a man-made construction material used to limit thermal changes, as well as sound transmission, in buildings. It is composed of bundles of very thin strands of glass, which has a high surface area-to-weight ratio that makes it a lightweight, cost-effective, and practical option for both residential and commercial applications. Fiberglass insulation is packaged in rolls that are installed along the walls and ceilings of a building during construction.

Though fiberglass as a material has existed since around the turn of the 20th century, the first fiberglass insulation was developed and available for sale in 1938. Initially a competitor to asbestos, the then-standard insulating material, it gained popularity as widespread understanding of the carcinogenic qualities of asbestos grew in the 1960s and 1970s, and forced builders to look for alternatives. With many of the same characteristics as asbestos, fiberglass was a natural option and quickly...

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Shopping your local home improvement store for insulation, you find two major categories: fiberglass and rigid foam. Can they be used interchangeably? Is one better than the other?

Fiberglass works best for some applications, rigid foam for others. In some places, rigid foam can only be used. Applications rarely intersect; generally, they are not interchangeable.

This guide separates the two and helps you find the best for your use.

Because rigid foam has a myriad of commercial and industrial uses, this guide refers to residential walls, ceilings, and floors.


Rigid Foam: Boards of styrofoam, usually in large sizes of 4' x 8', but also available in 2' x 4' sizes. This styrofoam is one of three materials: high quality, green-friendly polyisocyanurate; extruded polystyrene; or expanded polystyrene. Rigid foam performs well when subjected to moisture: it does not change dimensions, split, or crack. Fiberglass: Tightly packed long rolls or...
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To create fiberglass, manufacturers use kilns to melt down silica and other materials and form the molten glass base. As this substance cools, it is fed through a system of rollers and tiny extruders to create extremely thin glass fibers. These are chopped into pieces and combined with plastic fill to create fiberglass insulation.

One of the primary problems with fiberglass insulation is its effect on humans. Touching fiberglass fill without protection can lead to contact dermatitis, as tiny particles break off and become lodged in skin pores. Breathing in fiberglass dust can lead to much more serious health issues because the particles can lacerate the trachea and lungs and may contribute to lung cancer. For this reason, workers applying fiberglass insulation are required to wear eye and skin protection and use a breathing filter to prevent inhalation of the material.

Learn more about Building...
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Fiberglass Insulation is a popular choice in most homes. Reason being, the material is cost efficient, compared to the other insulation material. You will typically find fiberglass insulation as bats pressed between the studs. The other forms of fiberglass insulation comes in; long rolls (blankets or bats) and loose fill.

What is Fiberglass made of?

The material is plastic that is reinforced by small fibers of glass, adding additional strength to the plastic, which help improves the insulation maximum production tolerance.

How to differentiate Fiberglass from Cellulose:

Cellulose is shredded paper with a fire retardant chemical known as borate. Fiberglass usually comes in pink, green, yellow, and the material is plastic with tiny glass fibers.

10 Advantages to think about why you should buy fiberglass insulation:

1. Inexpensive investment.
2. The plastic covering on the fiberglass bats acts as a vapor barrier.
3. Will not burn....

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What is fiberglass insulation and why does it have that pink color? When was fiberglass insulation first used and what is fiberglass insulation used for today (besides insulating presumably)?

What is Fiberglass Insulation – Your Boring Wiki-Style Answer

Fiberglass is a man-made material used in construction for thermal insulation and sound proofing. It is made of very thin glass fibers, which is lightweight, cost-effective, and practical option for both residential and commercial applications. Fiberglass insulation is usually packaged like rock wool in either rolls, loose fill or 8 foot batts.

What is Fiberglass Insulation – A Micro History

Though fiberglass has been used since the turn of the 20th century, the first fiberglass insulation was developed and available for sale in 1938. Fiberglass gained popularity when asbestos fell out of favor as evidence of increased cancer rates became more widely known. This forced contractors to abandon asbestos...

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Further details needed.

So you had no smell before, and now you have a "hole" and smells coming through this hole? Is it from another apartment or something? What is on the other side of the hole?

Depending on the sourcing on the smell, there might be bigger issues at work. If a cat spent months peeing on the drywall opposite your wall (because the owner was too lazy to change the litter) that stuff can absorb into the drywall, then work it's way back into the insulation. And that smell will carry through the wall in the most awful way possible. You go right up to the wall and you can't smell it; but it sort of permeates everywhere.

But anyway, depending on the source of the smell, were you to simply patch up the wall and paint it, it will likely limit any smell. The fiberglass won't really do anything for any smell; it is just to provide heating insulation.

I guess charcoal near the hole might help, but I would definitely be trying to determine the...

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Soundproof insulation batt is an insulation made of mineral fiber. This mineral finer is either rock wool or processed fiberglass. Batt insulation is mainly used to insulate below the floors, within walls and above the ceiling. It is the least expensive insulation material and must be installed carefully to be effective. Batt insulation is not a great soundproofing agent to be used alone. It transmits sound through its fibers.

Types of Soundproof Insulation Batts

You can get insulation batts with facing or without facing. Faced insulation batts are used in walls, ceilings, basements and floors. The facing material is a vapor retarder. Gaps in between batts can accumulate condensation or air infiltration. This will weaken the effectiveness of the insulation. Insulation batts need to be installed very carefully.

Fiberglass insulation transmits sound through its fibers. This causes noises to sound like they are amplified. If fiberglass insulation must be used,...

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What is Fiberglass?

Fiberglass is a composite material widely used in the automotive industry, kit cars are often made from fiberglass as are many sports cars including the Chevrolet Corvette.

Fiberglass is an incredibly versatile material and it comes in several forms. Almost everyone has seen fiberglass insulation and anyone who has touched it will recall the itchy feeling often with a little rash which develops afterwards. This Is because the minute shards of glass cut into the skin and cause irritation.
The fiberglass used in the automotive industry is different from insulation fiberglass. It usually comes in a mat, tissue or cloth, although a chopped strand mixed with resin is often used for large applications such as boat hulls.

Working with Fiberglass is an unpleasant business due to the fumes from the resin...

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Fiberglass insulation was created in the early 1930s by a scientist at Owens Corning as an alternative to the highly-combustible materials used to insulate homes in those days. It is non-conductive, conveniently available in either roll or batt form, and has gone on to become the most popular insulating material currently available.

There’s magic in fiberglass insulation. The same fiberglass material in your walls and attics can keep you warm in the winter, and cool in the summer. But how does this amazing feat happen?

Because glass is naturally a bad conductor of heat, it was the logical base substance to use for an insulating material. Once the Owens Corning brains figured out how to turn glass into fiber material, they were off to the races — their new fiberglass creation could catch air between the multitude of layers of spun glass and prevent the heat from traveling through it. That both keeps heat inside on cold days and outside during the dog days of...

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Jesse writes from Longwood, Florida: "TWO QUESTIONS. first on - can fiberglass insulation touch a dryer vent pipe? i am replacing a thru the wall dryer vent cap and collar. In pulling out the old one, i noticed there is no insulation at all in the wall cavity near the dryer collar/sleeve. i was planning on stuffing some wall insulation into that cavity, to help insulate the wall area better and slow down the heat transfer in the summer and cold in the winter, but I’m not sure if fiberglass insulation can touch a dryer vent pipe? i have an electric dryer. I’m in the south, and have no gas connections so there will never be a gas fired dryer installed. Is fiberglass insulation safe to touch the pipe? Second question: on insulating walls and or attics in central Florida using Kraft paper backed batts. which way should the paper face? I've heard paper down in attic installations and paper inside on wall installations, but i see paper up and down in attics and inside and outside on...

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Cut batts to the appropriate height.

You should have purchased insulation of the appropriate width, but you'll have to cut it to size for every space you want to fill, in terms of height. Lay the insulation out, then carefully use your utility knife to cut through the face (if you've purchased faced insulation). It's kind of hard to cut through the insulation itself, which has the consistency of tenacious cotton candy, but you can pull it apart once you get it started.

When you get your insulation home, keep it wrapped up until you're ready to use it. Cutting fiberglass insulation sends lots of little fiberglass particulate up into the air, which can cause allergic reactions and breathing problems. It's also extremely itchy, and can cause rashes in some people with sensitive skin. Never touch fiberglass batting with your bare hands and always wear breathing equipment when handling it. If you come into contact with fiberglass insulation, don’t scrub your hands or face with...
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Fiberglass is a popular residential and commercial insulator because of its energy saving qualities and minimal fire hazards. There are, however, a few dangers associated with the installation of fiberglass. If you are considering installing fiberglass insulation in your home, here are a few dangers to know before you get started.


Fiberglass insulation comes in a variety of shapes and colors. The two most common forms are blankets, also referred to as batts, and loose fill. Batts typically come pre-cut to different widths and are stapled to the wall to keep secured. Loose fill comes in bags and is usually blown into places like the attic and floor cavities. There are hazards associated with both types of fiberglass installation.

Skin Irritation

Particles that become detached from fiberglass batts can cause skin irritation on contact. These particles can lodge themselves into pores in the skin and cause dryness. They can also potentially scratch...

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How It Works

The transfer of heat is slowed down with fiberglass insulation because the glass fibers trap air bubbles. These bubbles create an insulating effect by slowing heat exchange between areas and surfaces.

Spray foam contains a polymer, such as polyurethane, and a foaming agent. After being sprayed, it expands to roughly 100 times its original volume and hardens into a solid. As a result, it is able to fill vacant air gaps, and will expand and contract in relation to the building.

Types of Spray Foam Insulation

The two types of spray foam insulation are open-cell and closed-cell. Each kind has its advantages and disadvantages, based on insulation needs and costs.

Open-cell foam means that the cells are broken and air fills the gaps inside the material. Open-cell foam is thus softer and less structurally stiff than closed-cell foams, where the cells form a cohesive structure. The closed-cells hold their shape as they are filled with gas,...

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The correct installation of insulation is more important than ever. How the insulation is installed impacts energy conservation and indoor air comfort and quality. The selection of an insulation contractor determines how well the insulation is installed so that the insulation works in your structure.

We have a simple goal to offer the best Insulation service possible. Insulation is a passion for Daniel Insulation. Our next day Batt service is our trademark.Our installers are trained to install to Energy Star Standards and are factory trained.

Daniel Insulation offers a full line of insulation products and services. We can provide the best insulation for your individual requirements. The products range from Icynene® Spray Foam Insulation to Radiant Barrier to Polymaster to Fiberglass Batt and blow.

Daniel Insulation offers the experience you expect. The Company began in 1980. Tom Daniel grew the business from one truck into one of the top leading independent...

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Floor insulation with blow-in recycled cellulose

How it works

Cellulose insulation includes cellulose cells that have natural insulating power. It is made of shredded paper plus a fire retardant chemical known as a borate. The paper is broken down into cellular fibers that provide insulation.

Fiberglass insulation contains billions of tiny glass fibers, which contain trapped bubbles of air. These air bubbles slow the transfer of heat.

Pros and Cons

Fiberglass insulation is more common and can be installed more easily. However, it does not prevent air leakage and is potentially flammable. Fiberglass insulation loses heat quickly in extreme low temperatures.

Advantages of cellulose insulation include

a high R-value i.e. higher energy efficiency, and better sound insulation.

The disadvantages of cellulose include:

More expensive and requires professional installation City and regional/state building codes may not be updated...
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Insulation Blanket Thickness / R-Values

The higher the insulation blanket thickness, the higher the R-Value of the insulation. R-Value is a measurement of the effectiveness to retard or prevent the loss of heat flow. To achieve high R-Values a double layer system can be applied

Single Layer Insulation Systems

There are several thicknesses for single layer insulation blankets.

Click Here To See Single Layer Systems for More Info.

Double Layer Insulation Systems

Multiple layers can be applied to achieve higher r-values. Your purlin depth determines the thickness of your bottom layer.

Click Here To See Double Layer Systems for More Info.

Insulation Facings

There are several options available for facing materials applied to your fiberglass insulation. Facing materials are applied to fiberglass insulation blankets to serve as a vapor retarder as well as a protected cover over the...

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If you are interested in green building, or call yourself a green building expert, then you should know about mineral wool insulation. If you have not seen mineral wool handled and installed, then you need to read this.

If you think that mineral wool batts are similar enough to fiberglass batts that you already know what you need to know about it, then you are a fool. And you still need to read this.

If you have already read some of my essays, you know that I am an advocate of using mineral wool insulation to improve the energy performance of the houses we build in the U.S. There are many reasons why I think that mineral wool is the best insulation for us here. Recently I find myself making my case for this repeatedly, so I thought it would be worthwhile to get it all down in one place and just point to it in the future.

Mineral wool is different from fiberglass

So why am I constantly explaining why I like mineral wool, and what's good about mineral...

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In the world of insulation, seldom things are more heatedly debated than which type of insulation is better: fiberglass insulation or cellulose insulation. Both have their strengths and weaknesses, so let's see what all the fuss is about.

In order to fairly compare the two types of insulation, you have to consider all of the qualities the best insulation should do. This includes things like:

Increase the level of energy efficiency of your home

Reduce the risk of fire

Limit the amount of sound that passes through your walls and ceilings.

Increase Energy Efficiency

Increasing Energy Efficiency is such a vague concept. So, let's cut to the chase and just say Energy Efficiency = Lower Utility Bills.

define the overall energy efficiency of your home with the amount you spend each month to keep your home at a comfortable temperature or your heating and cooling bills. After all, isn't that the only thing that really...

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