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Question DetailsAsked on 8/25/2017

What is the correct way to install insulation in crawl space?

My home inspector found and note that, "The insulation was installed incorrectly. The insulation should be uptight against the floor sheathing, not sitting at the base of the joists."
My home builder refuse to do anything and said they the installation meets with building standard per city code.
Do I have good reason to ask builder to make it right?

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Voted Best Answer

Generally he is right - usually the insulation should be up against the floor (vapor barrier or paper side up) so there is no airspace above it which can be cooled by the colder joists and cause condensation in winter, or condense moisture in the air in summer due to the cooler air conditioned floor above.

However - if there are pipes up there and there is any chance of freezing conditions in the crawl space, the pipes should be above the insulation so they will be heated by the floor above and be insulated from the cold air below by the insulation - which means in some cases the insulation will have to sit at or about at the bottom of the joists.

You might have to check out the pipe locations (water and sewer both) or ask the inspector if he considered that issue.

You can also find the brand of insulation and then check the manufacturer website - if he went against the manufacturer recommendation without good reason that is cause to make him move it up.

You could also call the city building inspector and ask what the local code requires or allows.

Answered 3 years ago by LCD

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