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Question DetailsAsked on 5/9/2011

Can you install new attic insulation over existing spun glass?

looking to upgrade the attic insulation in a 30 yr old colonial.Previous insulation, along w/inadequate attic vents, (and perhaps bad original plywood underlayment) had led to moisture problems, which seriously demaged the plywood underlayment.Thus, w/new roof, found that nearly all of the plywood underlayment had to be replaced (3rd roofing), which added considerable expense. We also had installed 72 ft of ShingleVent II, required to uphold the new 30 yr roofing warranty. Any experience and learning in installing new attic insulation over existing spun glass, that will work well and not increase condensation? What companies, what materials, what prices for sq ft, etc.?

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5 Answers

0
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You've asked for advice on insulation that "will not increase condensation." You should be aware that no insulation increases condensation. Condensation is a result of warm, moist air that gets into the attic not being able to exit the roof space. You need good vapor barriers and adequate attic ventilation - continuous soffit vents which are unobstructed, a ridge vent, and gable vents are a good start. There are plenty of good books out there that will give you the basics of attic insulation.

All the standard types of insulation are good at what they do if they are installed properly. One concern many people are having now is with the environmental impact of insulation, in terms of both its manufacture and the ecofriendliness or lack thereof of the finished product. Again, there is plenty of data out there for the homeowner.

Answered 7 years ago by Commonsense

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Recycled denim insulation seems to be a growing trend. It might be worth looking into.

Answered 7 years ago by palanquin

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Another good idea is an attic vent fan. This is not the kind that cools your house, but rather one that is installed in the roof itself. A thermostat set to (as suggested by our contractor) 90 automatically turns on the fan which pulls the warm air out of the attic. This is in addition to roof vents.

mady

Answered 7 years ago by madylarian

0
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[quote user="Ron civility"]

Problem: looking to upgrade the attic insulation in a 30 yr old colonial.

Previous insulation, along w/inadequate attic vents, (and perhaps bad original plywood underlayment) had led to

moisture problems, which seriously demaged the plywood underlayment. Thus, w/new roof, found that nearly all of the plywood underlayment had to be replaced (3rd roofing), which added considerable expense. We also had installed 72 ft of ShingleVent II, required to uphold the new 30 yr roofing warranty.

Any experience and learning in installing new attic insulation over existing spun glass, that will work well and not increase condensation? What companies, what materials, what prices for sq ft, etc.?

thanks

ron




[/quote]


Anything but spun glass will perform much better.

Answered 7 years ago by Windows on Washington

0
Votes

Ron, Check out my review of Absolute Insulation if you are in the Washington, DC area. I just had my insulation upgraded. They charged a fair price and the job was done well. I knew about the situation where it is necessary to have air circulate out of the attic although it is contra-intuitive. How a freezing cold attic can keep a house warm is by have lots of insulation on the attic floor.

Additionally, I had two of those attic fans with thermostats. They use more electricity than they save and really do not work. My finally burned out and I had them removed when the roof shingles were replaced. They did not charge me anything to to this, so it was a good idea.

I would definitely upgrade the insulation. My house is 20 years old and had the original insulation. I upgraded that over the house and added insulation over the garage and on the walls of the garage.

Good luck.

George

Answered 7 years ago by GeorgeW




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