Serving the Southcoast Since 1951

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Attic Insulation

JM of New Bedord Co. has been insulating thousands of houses since 1951 and those that just insulated their attics saved on average 30%

Should I insulate the floor of the attic or the rafters?

Insulating the floor

Insulating the floor is a very good option if available, it enables you to easily get to the Heat resistance code of R38. It also leaves open the option of raising that value higher in the future.

By insulating the floor of your attic you cut off that attic space and no longer heat that area.

This also allows adequet ventillation for your roof which will last longer because of it.

Insulating rafters with vents

Insulating Rafters with prop-r-vents is good to create more conditioned space without loosing the roof ventilation.

The only down side to Prop-R-vents is that the actual vents take up an inch of space which reduces the potential R-value of that space.

You also end up heating more space which leads to higher fuel bills.

Insulating rafters without vents

When you make a “Hot Roof” you are actually stopping the ventilation that flows underneath the roof deck.

The problems with hot roofs are that they dramatically decrease the life of the shingles. The insulation behind the shingles trap the heat within the shingles, thus the sun bakes the shingles at a much faster rate.

What if I use my attic for storage?

If you would like to use your attic for storage we have two options

Our technicians can blow underneath the flooring and dense pack the insulation into the rafter space.


Build up the flooring with 2X6 to allow for extra space. Run boards perpendicular with existing joists.

Blown under flooring

Built up flooring

Possible Attic Problems

Air Leakage

Gaps and cracks should be sealed before installing insulation, especially when you have batt insulation.

Improper Venting

Bath fan was vented into the blocked soffit, causing the moist air to stay in the attic which led to mold.

Uneven Insulation

Heat will penetrate the low points in insulation. Get the most of your insulation by having someone install it correctly.

Attic / Stair Hatch Covering

An insulated hatch or stairway cover is needed. The absence of one will create huge noticable drafts.

Insulation Options

Attic Insulation

JM of New Bedord Co. has been insulating thousands of houses since 1951 and those that just insulated their attics saved on average 30%

Wall Insulation

Side wall insulation is not only good for reducing your energy bills, but it will also make you more comfortable in your home.

Basement / Crawl Space

Basement ceiling insulation is important to keep cold air out and floors warm on first floor. Many drafts enter a home through its basement.

Insultation Certifications

Massachusetts Certified Home Improvement Contractor (HIC) | Licensed | Construction Supervisor (Unrestricted) | BPI Certified | Nstar & National | Grid Certified Contractor through Masssave | EPA Lead-Safe Certified Firm | EPA Lead-Safe Certified Contractor

We provide FREE estimates and no project is too small.


Call Today

(508) 992-5770


423 Coggeshall St. New Bedford, MA


Monday-Friday 8am-5pm

Serving Southeastern, MA, Greater Boston & Cape Cod