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Figure 3 14 Illustrates A Vented Crawl Space With A Concrete Foundation Wall The Insulation Consists Of Foil Waterproofing Basement Crawlspace Batt Insulation
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Figure 3 15 Illustrates A Poured Concrete Crawl Space With Exterior Rigid Insulation The Rigid Wall Section Detail Building Foundation Construction Drawings
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Rim joist assembly must be insulated with air impermeable insulation or insulated on the exterior.
Crawl space insulation detail. Crawl space has a continuous cmu perimeter stem wall including between the porches and conditioned living area. Vented crawl spaces open to the outside while an unvented crawl spaces is part of the basement finished or unfinished. Figure 3 15 illustrates a poured concrete crawl space with exterior rigid insulation.
Rim joist insulation is provided by the exterior foam sheathing and additional rigid insulation on the inside of the rim. A crawl space is an unfinished accessible area below the ground floor of a building. Additionally it is one of the most inexpensive options.
If your house was built before energy conserving building codes were. Insulation also helps to preserve the air quality and reduce energy costs. The best insulation material for crawl spaces is a rigid foam insulation board.
Insulation not only plays a role in the thermal efficiency of a home but also in the way that moisture behaves. The rigid insulation aligns with rigid foam sheathing over the 2 x 4 wood frame wall above grade. Proper insulation can help protect your living space from outside temperature changes and cold or hot air moving in through the bottom of a house.
As the cross section shows the current plan is to spray 2 of closed cell foam on the inside of the conditioned crawl space cmu stem walls. Crawl space insulation as a part of overall home air sealing and insulation helps maintain your entire home s energy efficiency. Unlike fiberglass a properly sealed foam board does not absorb water support mold or allow air to pass through.
Fiberglass when installed in crawl spaces fiberglass is usually installed in the ceiling. Crawlspace insulation details figure 1 rigid insulation wraps concrete surfaces cold concrete foundation wall must be protected from interior moisture laden air in summer and winter. Damp dangling insulation is a sure sign of outdated or shoddy installation.
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