MOISTURE-BARRIER..HOUSE WRAP AND RAIN SCREEN  AIR BARRIER AS AN EXTERIOR APPLICATION 1 SHEET NO JOINS  Every house has three layers of protection the MOISTURE-BARRIER is the 30 minute paper or the house wrap.. the job of the MOISTURE-BARRIER is to keep driven rain, snow, fog,... any moisture from entering the wall cavity.. in the picture above, we have built a platform beside the house and are prefabbing the walls... we have used two layers of 30 minute paper... the bottom edge has a bug screen and we have placed our rain screen strapping at 16" centres. When placing the paper we start with two full strips and them the next strip is half way up. We continue this to the top...note at the top we have left enough paper to lap the top plates ... the spaces without rain screen strapping are window openings..for window wrap see moisture-barrier  The moisture barrier rain screen strapping is used in high rain fall areas mandatory by code ... the concept is that it promotes drying of the inner wall.. by allowing air movement and water bead drainage.. only mandatory in wet areas of the country When laying out the paper allow for any vertical edge overlaps to be 12" and when you come to a corner lap both directions to give a four layer cover at corners out side corners are quite easy to bend and keep nice but inside corners can be a little tougher take the time and make sure the creases are tight to the corner.. if not the cladding will not sit flat... see at far end (top picture) above the 12" overlap left on and note at the close end no furring strip... these are placed once wall is erected When rain screening over the MOISTURE-BARRIER paper such as above I use a minimum number of staples... the strapping holds the paper in position... if the plywood is 1/2" or thicker the furring can be nailed directly to it.. for the plywood is thick enough to hold the fasteners used on the cladding but ... it is a simple matter to line the furring over the studs and nail it straight through into them... just check the bottom plate for the nail positions of the stud lay it out and nail it on 6 nails is plenty... your siding fasteners will also penetrate right through and you will have a nail every 7 or so inches  .  When placing exhaust
ports ...electrical boxes any through wall
elementsFLASHING OUTSIDE CORNERS WITH SITE BUILT STANDING SEAM         THE BLUE LINES ARE ABOUT 1/4" AND 1/2 " BEND UP AT 1/2" MARK AND FOLD BACK DOWN AT 1/4" MARK    
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