Insulating Attic

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Topic: Insulating Attic

Life and Society October 6, 2012 at 12:36 am

Insulating Attic


I need recommendations on a good contractor to insulate my attic for the winter. I was told that it would cost about 600 to have it done professionally. 

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If you really want to same some money on your heating and cooling bills, spray foam at the underside of your roof is hands down the best option.  This is especially true if you have heating/cooling equipment in your attic.  We did it a two years ago and it has saved us quite a bit on our heating/cooling costs.  Cost was $2700 before 30% tax credit.  Another benefit is that the attic becomes unvented and “semi conditioned” which drastically reduces the amount of dust and insects that come through the vents and eventually into the house.

You can also easily do the blown insulation yourself. When you buy like 20 bags from HD, let you use machine for free. Should cost about 200 for the bags. Just need to find a friend/wife/husband, who will help ya out for a few hours. Buy the full body suits, and two sets of goggles, gloves, and face masks, and total cost is about $250. Super easy, we did it at my dads house, and are going to do my Petworth rowhouse shortly.

It’s really important to understand the realities of these energy savings measures and how they need to be installed to be effective.  Simply blowing insulation in the attic may save you some energy, but without airsealing the attic first, you are wasting a lot of opportunity and money.  Heat flows via air movement much more than through conduction, so you can put all of the insulation that you want in the attic, but if there are still areas with air leakage, you will not achieve nearly the energy savings of comfort improvements that you should.  I work for a large agency that specializes in buidling science and home energy issues and we spend a lot of time trying to educate folks on the realities of achieveing good energy savings with the work that done.  You may well spend that 600.00 to have some insulation blown in your attic, but without proper airsealing and good installaiton of the insulation, you won’t get the savings that you need.  I would really counsel you to work with a company that is certified with one of the energy efficiency specialist certifications (BPI, RESNET).  It may end up costing you a bit more in your installation costs, but you will save money every month for the rest of the time you own that house and that extra upfront cost will quickly be made back in savings.  A quick search found these guys: .  Certainly not the only ones in the area, a search on the or will let you find others.  I would be happy to answer any questions.

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