Attic Insulation

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Posted by: from Calgary
11/10/2011 at 10:00:12 PM

I have a 1200 square foot bungalow that was built in 1965 and my house is in Calgary. On average it has 8 to 10 inches of blown insulation in the attic. How many inches should I ideally have? And how much would it cost to bring someone in and have them blow in more insulation so that it is more ideal?



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Louis from SCL Renovations in Moncton
Date/Time11/11/2011 at 5:49:06 AM

Hi Aaron,

I'm going to assume that the 9 - 10 inches of insulation you have pink batt insulation. If I'm correct i can say you have approximately R 28 insulation in your attic. By today's standards you should be at R50. What I have been doing in these situations is using Weather Shield by Cancel.

Weather Shield is duty to work with but does an excellent job at creating a nice warm blanket over the old pink insulation covering all the gaps and cracks that batt insulation does not cover.

From your figures I believe you would need about 40 bags at a cost of $10 a bag taxes in in the Maritime.

I hope this was helpful.

SCL Renovations

Louis Landry

PS most hardware store will rent the blower for free when you purchase so many bags.

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Date/Time11/13/2011 at 7:34:42 PM

Hi Aaron, a friend of mine went through an energy audit and had to top up his attic from +/- R20 to R50. He paid a little over $1.00 per square foot for 12" of blown in fiberglass. This included extending the baffles and building up the attic hatch curb to 18". He had to insulate the hatch himself by cutting 2" pink or blue rigid to fit snugly and gluing on 5 layers (R50) to match the rest of the attic. He also put some weatherstripping on the ledge that the hatch sits on to make it as air tight as possible. Turns out he could have bought the insulation at HD and rented the blower - might have saved a few bucks but it is a messy job and the pros had it all done in 4 hours.

Good Luck!

Jim Kuzma

Kettleby Handyman Services

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