of the base material the drainage matrix 18 is available in 3 row heights 3 mm 7 mm and 11 mm of nominal dimension plus or minus 1 mm as shown in fig7 9 with widths ranging from u00bd inch to 1 inch the matrix 18 is spot heat bonded across the membrane width the membrane 10 is approximately 59 inches in width and 37 5 feet in length the drainage matrix 18 is formed with a series of drainage rows 32 of polypropylene nylon or clp plastic threads with each row being spaced apart by a channel 33 and running vertical to the top area 20 and bottom surface edge of membrane 10 the vertical raised thread rows 32 on the matrix are separated by spaced channels 33 the drainage rows run from about 16 to about 25 rows per linear foot which variance is caused by the differences in matrix row height the drainage matrix rows 32 are separated at 1 foot intervals by spaces to provide for a plurality of u00be inch expansion joints 34 on the drainage matrix the expansion joints 34 run parallel to the top and bottom edges of the membrane 10 and are positioned perpendicular to the linear orientation of the drainage rows 32 as shown in fig1 and 3 with the base of the expansion joint being about the same height as the base of the channels 33 between rows the draraable matrix 18 is spot heat welded to the spunbonded base material 12 so that a unitary sheet material is formed the present integrated rain screen vapor permeable water resistive air barrier sheet membrane with integrated tape can remain exposed.