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I’ve used a single piece of right angle galv. flashing (6″x6″) where the roof deck meets a exterior wall. (roof pitch 5:12) I installed the flashing by nailing it to the wall studs before plywood siding went on, with the other edge of flashing pushed down over roof deck and tar paper, which was then covered by asphalt shingles.
I had a couple of people tell me I should have used step flashing instead of the single length (apprx 10′) of 6″x6″ galv flashing.
Can someone please tell me why the step flashing would have been better than the single length? Would it be worth re-doing?
Thanks, Greg J.
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the single piece seems to be right , but it isn't..
the individual step flashings kick the water out at each course of shingles...
the continuous piece allow the water to run its entire length without redirecting it.. so of this water can work itself sideways and get behind your roofing... now it's a leak..
what kind of sidewall (siding ) are you using?
is it on yet?
if it isn't on yet , you can still easily install your step flashing.... leave the single piece right wher it is.. it's kind of like your second line of defense...
we make our step flashing from color coordinated Aluminum Coil Stock, 8x7, you can also buy step flashing at the lumber yard, 5x7, light aluminum mill finish.. we always leave our siding up 3/4" above the roof shingles so the bottom of our siding doesn't wick water up and rot out prematurely...
copper is a good step flash, so is lead coat copper, painted galvanize is good.. some of the materials are regional.....
*Greg,Step flashing would have been the choice. Removing the plywood siding and re-flashing would be a big chore. Could you saw off the bottom ~6" of the plywood, step flash, then stick a 1x6 ( with flashing on the top edge of course) back in as trim?Chase
*Greg,Mike explained it pretty well. The proper way to do it and the only way that will stand the test of time is step flashing. You need to re-do it. If it's only 10 running feet, that would only be about 3 pieces of plywood siding that you would need to remove and reinstall.If you are not familiar with step flashing, have somebody that is take care of it for you. If the shingles are already on, it would take them about 5 minutes to install the flashing, if that. It would be another few minutes if they have to pull some nails out.This will be time well spent to ensure a leak free area for many years.Red dog
*Greg, you can also change the plywood siding into sheathing and apply your stepflashing to the then plywood... then apply a permanent siding over that like changing the gable end to clapboards, or red cedar shingles , or Hardie plank.... if you have texture 1-11 , it often is used as a temporary siding and eventually gets sided over in the first remodel...b just another option
*If you held your siding up off the deck about 3/4" as Mike suggested,you won't need to mess around with removing siding to install the step flashing.You might need to loosen the bottom 6-12 " of the T 1-11 or whatever plywood siding you used but removing it will not be needed.You may not even need to loosen it.The step flashing should be nailed to the deck and NOT to the wall(pretty much opposite of the way you nailed the continuous flashing).You want the flashing to lay flat on the deck where any ripple would telegraph through the shingles.Ripples behind the siding won't show.Nail high up on the step flashing and make sure each nail is covered by the next step .Easier to show than to wrrite about.The time involved in this procedure is just about how Red Dog explained it.( I know it took me longer to type this then it would have taken me to do the actual work.I would suggest you have someone familiar with this procedure do the work for you as there is definitely a pattern you have to follow.It won't take long,but there is a moderate P.I.T.A factor involved which should cost you some money and a slightly condescending attitude from the roofer.Good Luck All,Stephen
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I've used a single piece of right angle galv. flashing (6"x6") where the roof deck meets a exterior wall. (roof pitch 5:12) I installed the flashing by nailing it to the wall studs before plywood siding went on, with the other edge of flashing pushed down over roof deck and tar paper, which was then covered by asphalt shingles.
I had a couple of people tell me I should have used step flashing instead of the single length (apprx 10') of 6"x6" galv flashing.
Can someone please tell me why the step flashing would have been better than the single length? Would it be worth re-doing?
Thanks, Greg J.