How to fix attic insulation mistakes?

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Old 12-12-04, 06:40 AM
buster brown
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How to fix attic insulation mistakes?

Bought a 66 yr old cape cod in NYS. Attic insulation put in rafters and soffit area right up against roof, no baffle vents and soffit vents closed off. Keep getting mixed answers. Some say too much work to pull down insulation, other say has to be done. Walk up attic with ridge vent and windows on N & S end. Also insulation put in exterior wall of attic area as well, unfinished attic. Will soon be replacing roof as the shingles are cracking in diagonal pattern on roof. Any relation here between the two? Again, I can not seem to get a consistent straight answer. Numerous water leaks have been patched over fall. Attic just used for storage only. Was even told by a roofing contractor that the roof still had about 5 yrs left!! There are vinyl soffits vents on the exterior but no one ever drilled openings to let any air flow through, they are basically useless. Any suggestions on fixing all these problems?
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Old 12-12-04, 01:38 PM
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Attic Insulation

For an unfinished attic, insulation should be in the floor only.

There is no harm in insulating the gable ends as well as rafter spaces, but this means that your house is heating this walk-up attic when you really don't need it to be.

As long as you have kraft faced insulation installed with the paper covering all rafters and gable end studs, you need not worry about ventilation in this attic.
 
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Old 12-12-04, 02:06 PM
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Will soon be replacing roof as the shingles are cracking in diagonal pattern on roof. Any relation here between the two?
Yes for sure. That is why you have to get the insulation down off the roof rafters. This is what cooked the roof shingles on you. Used attic only for storage. Id take it all down and go for R-38 in the ceiling rafters there. Make sure you get the foam rafter vents so air from the over hang can get up into the attic there. Also put some gable vents in there.

ED
 
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Old 12-16-04, 06:37 PM
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Nonsense

"Yes for sure. That is why you have to get the insulation down off the roof rafters. This is what cooked the roof shingles on you. "

Nonsense.

Having insulation against the rafters keeps the entire roof sheathing surface COOLER than if the insulation is left in the floor alone.
 
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Old 12-18-04, 01:31 PM
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The books sure dont say it that way. No insulation up tight to the roof boards. Why do they make rafter foam vents .

ED
 
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Old 12-23-04, 05:41 PM
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Not My Point

You missed the point entirely.

All things being equal ventilationwise, having insulation in rafters will not the keep the roof shingles from being any 'cooler' than if the insulation is in the floor of the attic.

The REASON is that if the rafters are vented properly as you suggest, the shingles will get no hotter having insulation in the rafters or insulation in the floor.

So the answer is for proper ventilation (which we both seem to be rightfully suggesting)...

My objection is that having insulation in the rafter spaces, even with no ventilation, does NOT increase the roof temperature thereby 'cooking' the shingles.

This just does not happen.

You can certainly have condensation problems, but insulation in rafters does not make a roof hotter...and does not shorten the life of shingles.

If I am misunderstanding what you, Ed, stated...we may simply be saying the same thing but just speaking past on another,...and if so, my apologies.

homebild
 
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