What type of insulation should I use for varying joist spans of 3-4ft?


Figuring out what type of insulation to use can be tricky and as HVAC contractors we are often asked, “what type of insulation should I use in my attic?” As with many of these questions, the answer depends on where you live so I will tailor this article towards showing you how to figure out what type of insulation and how much of it to use based on your local climate. Attic roof insulation is as much of an art as it is a science, so we will start with the basics and work our way up. In this article we will first discuss what insulation is used for, how insulation is rated, and the different types of insulation. Then we will answer the questions of how much insulation you should have in your attic as well as what type of insulation you should use for your region.

Your air conditioning and heating system is only a part of maintaining a comfortable and energy efficient home. Imagine how efficient your furnace would be if you left all of your windows open during a blizzard – the...

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We started remodeling the 2nd floor this last fall, starting with a spare bedroom, but between our day jobs and the holidays, we ran out of time, stopping short of dry-walling - the room is sealed and insulated but it's still "open".

After we had gutted the room, we noticed that there was a pretty decent amount of space in the attic. It's the style that's all open (no wood supports in the middle). I'd like to use this space to make a small office and provide some additional storage (clothes, toys, etc...) - the only problem is, the ceiling joists / floor of the attic is made of 2x4's.

I know this is wrong; it may be ok for storage with some plywood covering it, but I don't think I want to trust it to support a desk and me working up there.

Would anyone know the minimum floor joists we would need to install? 2x6? 2x8?

3/4 plywood - I know that - and later we could do a dormer if we feel we need it.

Also, any links to how to finish the attic? It's...

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How does the insulation in your attic look? This is a question that stumps many homeowners. In fact, many homeowners believe that because the attic is unconditioned space, insulating that area of the home is of little concern. However, insulating your attic is one of the greatest things you can do to improve your home’s overall comfort and energy efficiency. This is especially true if you have ductwork in the attic. Not sure where to start with insulation in your attic? Here is a look at some of the most effective insulation materials for attics.

Cellulose Insulation

Cellulose insulation is comprised of recycled paper products that have been treated with a special fire retardant for fire resistance. It is most often used in “loose fill” form and blown into attics and walls using special equipment. It’s especially popular here in Westchester and Putnam Counties because it strikes the perfect balance between high performance and affordability. Benefits of cellulose...

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There are several different types of insulation, and a professional insulation contractor will be able to tell you which type is best for your home and specific situation. Loose-fill (blown-in) is very common, but there are different types of insulation for many different areas of a home – and different materials as well.

Whether you need attic insulation, crawl space insulation or office building wall insulation, there is a material that works for your project.

Different Types of Insulation: Form

Loose-fill / blown-in Batts and rolls / blanket Foam or rigid board Reflective

Loose-Fill/Blown-In Insulation

Loose-fill or blown-in insulation is one of the most common types of insulation and works exactly how it sounds. It is blown into a wall cavity or designated space using special equipment. Loose-fill insulation is used for:

Open new wall cavities Enclosed existing walls Unfinished attic floors and walls Areas that are hard to reach

Batts and...

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Can some one tell me what A123 configuration/ cell number I would need for an electric project I am contemplating.

I want to use the eflite power 160(or comprable) which has a 60A continuous,max burst of 78, 2700w input watts, and requires a 9-10 lipo setup.

it suggests 15 lbs 3d aircraft,12-20 sport

I am planning to purchase a castle creations HV85. it is rated at 85 max amps and handle up 12s lipos

I am planning on putting it into a 1/4 scale CAP with lots off room to accomadate A123s

I chose the eflight power 160 because it seems to be a good all around motor and the HV85 because its a good deal considering jumping to the 110amp is a huge price differnce

I am not committed to either the esc or motor so if any one had other alternatives for this size airframe please chime...

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Frequently Asked Questions about our natural insulations, this page contains answers to commonly-asked questions about our products.


Continuously rising energy prices are forcing society to make serious considerations towards long term home improvements. During the past decade, energy prices have risen by almost 30% and are set to increase by up to an additional 50% before 2030.

Insulating a building is the first step towards reducing energy consumption, improving thermal efficiency and cutting energy costs. By insulating the loft space of a typical house this can reduce energy bills by 25%.

Why should I choose natural fibre insulations over mineral wool?

Natural fibre insulations can offer a number of unique benefits in addition to being an excellent thermal insulator. These benefits include:

Moisture control Absorption of noxious gases Improved breathability Durability Sustainable Biodegradable What is the difference between Black Mountain...
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Joists are the horizontal members that make up the structural framing of a deck, floor, ceiling or roof. Often made from wood or steel, they are engineered specifically to provide adequate support to various structural applications. A joist is supported at either end by either a beam, wall, or other framing member. They may also require additional supports, known as "intermediate supports," along their length. Joist span is the distance between the beams, walls, or other structures that support a joist along its length.

The total joist span is the distance from one end of the joist to the other. When sizing a joist or determining its span, builders must examine the design span rather than the total span. The design span is the length of the joist measured from the face of the supports at either end. For example, a 10-foot (3.05 m) joist resting on a 6-inch (15.24 cm) wall at either end has a design span of 9 feet (2.743 m).

The size and material of a joist is directly...

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There are various types of insulation commonly found in residential and commercial buildings. Insulation is used to make things airtight and save a person money on their energy bill. Walls, ceilings and floors that are well-insulated will keep cold drafts out during the wintertime, holding the heat in and causing lower energy bills.

Different types of insulation also hold different R-values. R-values measure the effectiveness that any particular piece of insulation may have. This is based on the insulation's thickness, material and density. The more effective a piece of insulation is, the higher its R-value will be. There are various types of insulation on the market, but the four most commonly used types of insulation are loose-fill insulation, blanket insulation, rigid board insulation and spray foam insulation.

Loose-fill insulation is composed of loose fibers and fiber pellets that are blown into cavities or attics using special equipment. Loose-fill insulation is...

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Insulation is crucial to your home. The right insulation will help lower your energy costs, keeping your home warmer in the winter and cooler in the summer. What types of insulation are available? When should you use them in your home to get the most benefits available?

Four Insulation Types

Before you begin looking at various types of insulation, check for any applicable code requirements, especially for new construction. If you aren't sure what type of insulation to get for your home, visit your local home improvement or building supply store and ask to speak to a specialist. He'll probably want to know what type of construction your home is, such as brick, stone or wood, as well as the age and condition of your home to help determine what type is best. There are four main insulation types, and not all of them are suitable for every area of the home.

Batt and Blanket Insulation

This insulation type is constructed of mineral fiber, which...

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What is it?

A span is:

A very lightweight abstraction of a contiguous sequence of values of type T somewhere in memory. Basically a struct { T * const ptr; size_t length; } with a bunch of convenience methods. A non-owning type (i.e. a "reference-type" rather than a "value type"): It never allocates nor deallocates anything and does not keep smart pointers alive.

It was formerly known as an array_view and even earlier as array_ref.

When should I use it?

First, when not to use it:

Don't use it in code that could just take any pair of start & end iterators, like std::sort, std::find_if, std::copy and all of those super-generic templated functions. Don't use it if you have a standard library container (or a Boost container etc.) which you know is the right fit for your code. It's not intended to supplant any of them.

Now for when to actually use it:

Use span (respectively, span) instead of a free-standing T* (respectively const T*) for...

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