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Old 04-14-2014, 08:33 PM   #1
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Please advise - step flashing installation


We are in the process of getting a house built through a national builder. An independent inspector pointed out that our roof step flashing was installed over the WRB/house wrap, which according to the inspector is a huge issue (reverse shingling?) that will lead to leaks as soon as the tape holding the WRB in place gives out. Our builder and the roofing subcontractor claim that this installation is completely acceptable and simply one of many ways of flashing a roof and refuse to change the installation. Who is right? How serious is this and how likely is it to lead to problems down the road?

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Old 04-14-2014, 08:41 PM   #2
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Please advise - step flashing installation


It's incorrect. Builders and siders have NO clue how to waterproof a window, wall, or door, and plenty of water will see the WRB every time it rains. It will eventually work it's way behind the flashing and leak. Often, just after the builder's warranty expires.
The Inspector is correct. Refuse to pay/purchase until remedied.

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Old 04-14-2014, 08:43 PM   #3
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Please advise - step flashing installation


Not sure what you mean specifically, bt if you check out the instructions for flashing say a skylight, it is the wrb (graces or the like) that goes on FIRST followed by an interweave of shingles and flashing. Ron
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Old 04-14-2014, 11:57 PM   #4
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Please advise - step flashing installation


And the roofer is paid by the builder.... hmm. Did you check on-line with the asphalt shingle manufacturer or read the paper wrapping for step-flash details?

The WRB requires lapping over itself to direct water outward; " R703.2 Water-resistive barrier.
One layer of No. 15 asphalt felt, free from holes and breaks, complying with ASTM D 226 for Type 1 felt or other approved water-resistive barrier shall be applied over studs or sheathing of all exterior walls. Such felt or material shall be applied horizontally, with the upper layer lapped over the lower layer not less than 2 inches (51 mm). Where joints occur, felt shall be lapped not less than 6 inches (152 mm). The felt or other approved material shall be continuous to the top of walls and terminated at penetrations and building appendages in a manner to meet the requirements of the exterior wall envelope as described in Section R703.1. " From; http://publicecodes.cyberregs.com/ic...2_7_par034.htm

And basic Building Science requires it; http://www.buildingscience.com/docum...rainage-planes

Otherwise, you have water problems; http://www.google.com/url?sa=t&rct=j...,d.aWc&cad=rja

Even metal/sticky flashing require "shingle" method;

"Approved corrosion-resistant flashing shall be applied shingle-fashion in a manner to prevent entry of water into the wall cavity or penetration of water to the building structural framing components. Self-adhered membranes used as flashing shall comply with AAMA 711. The flashing shall extend to the surface of the exterior wall finish. Approved corrosion-resistant flashings shall be installed at all of the following locations: " read the rest at; http://publicecodes.cyberregs.com/ic...2_7_par066.htm

Side-walls; http://publicecodes.cyberregs.com/ic...2_9_par030.htm

Where are you, State? What type/brand of siding?

Gary
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Old 04-15-2014, 06:13 AM   #5
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Please advise - step flashing installation


+1

We talking about housewrap or Ice/Water?
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Old 04-15-2014, 07:21 AM   #6
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Please advise - step flashing installation


Is it a very simple fix if its just over the housewrap, I cant imagine anyone refusing to fix it at this point.

If they want to let something like this go, I would have your independent inspector over more regularly...
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Old 04-15-2014, 04:30 PM   #7
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Please advise - step flashing installation


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Originally Posted by Gary in WA View Post
And the roofer is paid by the builder.... hmm. Did you check on-line with the asphalt shingle manufacturer or read the paper wrapping for step-flash details?

The WRB requires lapping over itself to direct water outward; " R703.2 Water-resistive barrier.
One layer of No. 15 asphalt felt, free from holes and breaks, complying with ASTM D 226 for Type 1 felt or other approved water-resistive barrier shall be applied over studs or sheathing of all exterior walls. Such felt or material shall be applied horizontally, with the upper layer lapped over the lower layer not less than 2 inches (51 mm). Where joints occur, felt shall be lapped not less than 6 inches (152 mm). The felt or other approved material shall be continuous to the top of walls and terminated at penetrations and building appendages in a manner to meet the requirements of the exterior wall envelope as described in Section R703.1. " From; http://publicecodes.cyberregs.com/ic...2_7_par034.htm

And basic Building Science requires it; http://www.buildingscience.com/docum...rainage-planes

Otherwise, you have water problems; http://www.google.com/url?sa=t&rct=j...,d.aWc&cad=rja

Even metal/sticky flashing require "shingle" method;

"Approved corrosion-resistant flashing shall be applied shingle-fashion in a manner to prevent entry of water into the wall cavity or penetration of water to the building structural framing components. Self-adhered membranes used as flashing shall comply with AAMA 711. The flashing shall extend to the surface of the exterior wall finish. Approved corrosion-resistant flashings shall be installed at all of the following locations: " read the rest at; http://publicecodes.cyberregs.com/ic...2_7_par066.htm

Side-walls; http://publicecodes.cyberregs.com/ic...2_9_par030.htm

Where are you, State? What type/brand of siding?

Gary
Bad day for me, must be missing something again. Everyone's response is dealing with flashing over doors and windows, house wrap, and the like. But I thought that the OP was asking about step flashing STEP-FLASHING on the ROOF which I am assuming is in a valley or along the edge of a dormer or the like. And in those cases the wrb goes on first with the shingles and step flashing interwoven over the top.

Ron
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Old 04-15-2014, 04:48 PM   #8
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Please advise - step flashing installation


Quote:
Originally Posted by ront02769 View Post
Bad day for me, must be missing something again. Everyone's response is dealing with flashing over doors and windows, house wrap, and the like. But I thought that the OP was asking about step flashing STEP-FLASHING on the ROOF which I am assuming is in a valley or along the edge of a dormer or the like. And in those cases the wrb goes on first with the shingles and step flashing interwoven over the top.

Ron
I thought OP was talking about the wall side of the step flashing being over the wrb and then taped. Is so then that's a bad detail that will fail...Especially if the siding is vinyl.
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Old 04-15-2014, 04:50 PM   #9
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Please advise - step flashing installation


Quote:
Originally Posted by ront02769 View Post
Bad day for me, must be missing something again. Everyone's response is dealing with flashing over doors and windows, house wrap, and the like. But I thought that the OP was asking about step flashing STEP-FLASHING on the ROOF which I am assuming is in a valley or along the edge of a dormer or the like. And in those cases the wrb goes on first with the shingles and step flashing interwoven over the top.

Ron
Along sidewalls the step flashing is installed and then the housewrap(on the wall) is install overtop of that. This brings any accumulated moisture to the outside of the assembly...
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Old 04-15-2014, 11:21 PM   #10
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Please advise - step flashing installation


" roof step flashing was installed over the WRB/house wrap"-------- house wrap would not be installed on roofs, only walls. Water Resistive Barrier, per code; "WATER-RESISTIVE BARRIER. A material behind an exterior wall covering that is intended to resist liquid water that has penetrated behind the exterior covering from further intruding into the exterior wall assembly. "

Perhaps if said installed after the house wrap...... it may be understood better for some...this link shows you have to apply sticky flashing and metal flashing in "shingle fashion" on step-flashing at a side wall (as stated earlier); http://publicecodes.cyberregs.com/ic...2_7_par066.htm


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Old 04-16-2014, 06:40 AM   #11
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Please advise - step flashing installation


Thank you all for these great and informative responses.

Just a few clarifications. I was asking about the wall side of roof step flashing being installed over WRB and then taped in place. Our siding will be vinyl by KP products. We are located in SC. I am attaching a picture of what this looks like. They seemed to have followed this pattern elsewhere on the house where flashing and WRB meet (except windows).

Although it seems like it would be easy to fix at this stage, the builder refuses to fix as "this is how they have always done it".
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Please advise - step flashing installation-img_3349.jpg  
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Old 04-16-2014, 09:55 AM   #12
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Please advise - step flashing installation


"this is how they have always done it". Is no excuse for doing it wrong. Sounds like they should switch plans and attempt to do something correctly for once.
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Old 04-16-2014, 09:57 AM   #13
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Please advise - step flashing installation


Not too swift on window flashing either. http://www.albertsroofing.com/Window%20Flashing.htm
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Old 04-16-2014, 12:54 PM   #14
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Please advise - step flashing installation


You are under the IBC codes, not IRC; http://www.reedconstructiondata.com/...outh-carolina/
Much more difficult to research and prove the sticky tape problem.

Speaking of problems; http://www.consumeraffairs.com/housing/ryan.html

Nothing definite about sticky use; http://publicecodes.cyberregs.com/ic..._14_par044.htm

Did you check the shingle maker directions with flashing to side-wall; http://publicecodes.cyberregs.com/ic..._15_par070.htm

Tapes are not long-term equal to lapping HW; Tyvek behind vinyl siding

Still researching Tyvek (Ryan brand) flashing application instructions, though you may have to live with existing in the end, IMO.

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Old 04-16-2014, 01:44 PM   #15
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Please advise - step flashing installation


IF (you would need to verify) Ryan is using Tyvek brand, the instructions are pretty straightforward using step flashing; pp. 5- tape to air-seal, Step #5.

And step-flashing lapped with Tyvek only- not tape on page #6 under "Terminations"; http://www.google.com/url?sa=t&rct=j...pg_Gog&cad=rja

Your windows are not correct, hard to see from pictures- though the jamb tapes are wrong (over the head tape);
Window after Tyvek; http://www.google.com/url?sa=t&rct=j...,d.aWc&cad=rja

Window before Tyvek; http://www.google.com/url?sa=t&rct=j...64764171,d.aWc

Gary
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Last edited by Gary in WA; 04-16-2014 at 01:47 PM.
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