Phone Log

Contact:	Matt Schaeffer, National Association of Home Builders Research
Center, 1-800-638-8556

ICF Employee:  	Chelsea Landon

Date:			July 17, 2007

Summary:

Mr. Schaeffer was contacted on 7/17/07 for advice regarding average
number of windows and standard window size for U.S. homes built in 1971.
 During this conversation, he provided the following recommendations. 

Data Type	NAHB Recommendation

	Value	Units

Standard window size	3 x 5	feet

Window sill depth	2 - 3	inches

Glazing area:  floor	12 - 15	percent floor area

Glazing area:  wall	15 - 20	percent wall area



