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Up Up And Away! ...Scuttle Hatches........Part 3: Insulation as Air Filter

Up Up And Away! ...Scuttle Hatches........Part 3: Insulation as Air Filter
This is something that I see quite regularly. Most people forget that the modern attic is not a storage area of the home. It is a structural service area and is a cold zone. It is outside the thermal envelope of the home. For all intents and purposes it IS outside the home (It's just rain sheltered.)
So what does this mean to home owners. Unfortunately, from the evidence I've seen, to a great many, it doesn't mean a thing.
Why do I say that?  What evidence an I seeing?
Well, consider what's shown in the photo above. Yes, it's an open attic hatchway with the ladder positioned and prepared for the inspection.
Already, I haven't even entered the attic yet, but I can see evidence of a chronic problem. 
I can see the hatch which is well made of a solid board with rigid insulation glued on it. This is a good detail because it means that when the hatch cover is in the closed position, the hatch area itself is sure to be insulated.
Now look at the other insulation. The fiberglass. The colour. (Originally it was ... more

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