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Double sided tape

Double sided tape 3M 9589 

Double sided tape 3M 9589 half inch 

This is for use for sticking the various waterproof membranes in place.

3M 9589 Double sided tape.  Half inch width is about $10 per 100 foot reel.

http://www.uline.com/Product/Detail/S-10086/3M-Double-Sided-Tapes/3M-9589-Double-Sided-Film-Tape-1-2-x-36-

Other wider widths are also available (but half inch will be fine).

http://www.uline.com/BL_6028/3M-9589-Double-Sided-Polyethylene-Film-Tape

Another possibility is SIGA Twinet double sided tape available from albert.rooks@mac.com.  A 50 yard reel is about $40.