Applications Products Resources and Tools Energy Savings Center Literature  
Printer-Friendly View

Crawlspaces

Crawlspace insulation can reduce energy loss from the ground up.

Reduce Energy Loss from the ground up.

Leaving your crawlspace uninsulated can be a major source of energy loss in your home. A continuous layer of STYROFOAM™ extruded polystyrene or polyisocyanurate insulation on the interior surface of the crawlspace walls is the most effective way to reduce energy loss. It's moisture resistant and reduces the potential for damp, musty crawlspaces. Plus, it cuts easily and installs quickly.

There's a Dow insulation product that's right for every crawlspace:
My project or needs are: Recommended Product Solution Installation Instructions/Considerations Building Code Compliance
Insulate crawlspace that does not have vents in the crawlspace wall and does not have ventilation openings to the living area. STYROFOAM Square Edge View Installation Instructions
Download Installation Instructions (996KB PDF)
 Complies with ASTM C578 Type IV. Meets IBC/IRC requirements for foam plastic insulation. See ICBO-ES ER 2257, BOCA-ES RR 21-02, NES NER 699, Und. Lab. Inc.® Classified, see Classification Certificate D369.
STYROFOAM SCOREBOARD™ View Installation Instructions
Download Installation Instructions (996KB PDF)		 Complies with ASTM C 578 Type IV. Meets IBC/IRC requirements for foam plastic insulation. See ICBO-ES ER 2257, BOCA-ES RR 21-02, NES NER 699, Und. Lab. Inc.® Classified, see Classification Certificate D369.
STYROFOAM Tongue & Groove View Installation Instructions
Download Installation Instructions (996KB PDF)
 Complies with ASTM C 578 Type IV. Meets IBC/IRC requirements for foam plastic insulation. See ICBO-ES ER 2257, BOCA-ES RR 21-02, NES NER 699, Und. Lab. Inc.® Classified, see Classification Certificate D369.
THERMAX™ Sheathing View Installation Instructions Complies with ASTM C 1289 Type I, Class 2. Meets IBC/IRC requirements for foam plastic insulation. See NES NER 681.
Insulate crawlspace that does not have vents in the crawlspace wall but does have ventilation openings to the living area. THERMAX Sheathing View Installation Instructions Complies with ASTM C 1289 Type I, Class 2. Meets IBC/IRC requirements for foam plastic insulation. See NES NER 681.
Insulate crawlspace and resist termites tunneling through foam. STYROFOAM BLUEGUARD™ View Installation Instructions
Download Installation Instructions (200KB PDF)		 Meets IBC/IRC requirements for foam plastic insulation. Meets ICC-ES acceptance criteria of ICC-ES EG-239 Evaluation Guide for Termite Resistant Foam Plastic insulation for use in heavy termite infestation areas. (ICC-ES NER-699 udate in progress.)

Related Information
Tech Note
Technote: Insulating Crawlspaces with STYROFOAM (148KB PDF)
Breathe Easier With A Non-Vented Crawlspace (702KB PDF)
FAST FACTS: Saving Crawlspaces - Keeping Out Humidity (120KB PDF)