This is to facilitate water flow.
Installing z flashing on siding.
Begin at either end of the wall and set the level middle.
You set flashing upon top edge of each piece of plywood over a fat bead of caulk and hold it in place with just heads of roofing nails driven into sheathing.
How to install z flashing on t1 11 siding.
Snap a chalk line cut out the siding and tack up the ledger board.
The instructions also call for at least a 1 4 gap between the materials at the site of the z flash.
Although commonly called z flashing the z has squared corners and it could as easily have been named stair step flashing we see it most often used at the horizontal joint between two sheets of plywood exterior siding to provide protection from water seeping in at the opening.
Install the first length of z flashing.
Install the trim just under the drip cap.
How to install z flashing on rotted t1 11 siding 1.
Start by making an outline on the siding where you want to position the ledger board.
Use a j roller to ensure that the flashing tape is firmly secured to the window frame and the wrb.
First tape the bottom of the frame and then up the sides.
Do not caulk extend shingles at least 1 in.
Complete the installation of the first horizontal row of t1 11 siding following standard construction practices.
Cap staples may also be used to ensure that the flashing tape is held in place.
Do not caulk clearance and flashing requirements hardiepanel vertical siding hs1237 p2 3 09 19 figure 10 sheltered areas figure 11 mortar masonry min.
Next comes another layer of building wrap installed like the first layer.
Test the rotted area of the t1 11 siding by poking it with a nail or a screwdriver.
Galvanized z flashing so called because of its z shaped profile keeps water from getting through horizontal joints between sheets of plywood siding.
If only the surface is damaged.
Scrape loose paint off the rotted area with a putty knife and use 80 grit sandpaper to smooth the rough surface if.
Then slip flashing behind the siding covering the top edge of the ledger.
When reading the installation details for hardie siding lp smart lap and tru wood sidings the z flashing is always shown with at least a 5 degree angle away from the building.
Make the outline large enough to include space for the deck boards on top the ledger and any trim boards on the sides.
Out from the fascia when gutters are present as required by irc code min 4 in.
