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-   -   Ice and Water Shield under drip edge? (http://www.diychatroom.com/f9/ice-water-shield-under-drip-edge-50329/)

sutterml 08-05-2009 03:46 PM

Ice and Water Shield under drip edge?
 
I'm having my roof redone as we speak and I noticed the roofer is installing ice and water shield under the drip edge. I thought it was supposed to be installed over the top of the drip edge? Everything I've found online indicates installing TWS over the drip edge. I questioned it and he said that under the drip edge was correct and they were going to install another strip over the drip edge before shingling. Is this OK or should I press the issue?

Scuba_Dave 08-05-2009 03:55 PM

Usually its over on the bottom - gutter edge
And under on the side/rake/gable end

But I have read on here where they run it under the bottom edge down onto the soffit board. Then they install the drip edge on top

http://images.lowes.com/general/r/roofDripEdges.gif

MJW 08-05-2009 04:13 PM

As long as they put a strip on top you will be fine.

I've seen jobs where it is installed under the drip edge and it works ok, but eventually it pops loose from the wood fascia or gutter.

MSA book says over the drip edge with metal soffit and fascia. Under drip edge and onto wood fascia when not using metal.

We always put the drip edge on first now. Years ago when we didn't, there was problems. To pass inspection here we have to have a visual inspection or pictures of the I&W on top of the drip edge on eaves.

sutterml 08-05-2009 05:21 PM

Judging by the looks of it so far, they put the full 3 foot ice and water shield under the drip edge, then another 8" strip over the drip edge. Seems odd to me, but I'm no roofer. :)

dmc@RCR 08-05-2009 06:37 PM

Always under the drip edge and behind the gutter.

This prevents ice and water from backing up under the drip edge and into the gap between the roof sheathing and fascia(gutter board). Easiest way is to put a strip (9"-12" or so) on the bottom first, then the drip, then the full sheet over the drip edge.

Manufacturers specifications are not always right or best practice.

MJW 08-05-2009 07:00 PM

What do you do when you have to replace the fascia and not the roof?

That is why I&W goes on top of the drip edge.

dmc@RCR 08-05-2009 09:21 PM

Quote:

What do you do when you have to replace the fascia and not the roof?

That is why I&W goes on top of the drip edge.
:confused1:

Normally when we replace fascia, we just slip it out from behind the gutter, because the gutter installers left out the spikes just so we could remove the fascia easily, and the carpenters left out the nails holding the fascia board on just so we could remove the fascia easily.

kangaroofer 08-28-2009 09:34 AM

I have worked with roofers who have differing opinions, most are valid. My opinion however is that if the I&W is placed underneath the drip edge, over the edge of the sheathing, this will prevent problems in the winter time with ice damming and the melt creeping up underneath the drip edge to bare sheathing. At least this way if ice pushes nails up on the drip edge the sheathing is covered and the chance of a leak is minimised somewhat. Having the I&W over the drip will expose bare sheathing if the drip edge lifts. JMHO

sjf 08-20-2010 02:07 PM

Industry standards
 
There are actually 3 different ways of installing the IWS (underlayment) on a roof edge. All 3 are acceptable and approved by the NRCA (National Roofing Contractors Association). The rake edge of the roof is put over the top of the IWS and building paper. The drip edge can have the style D roof edge capped by the IWS (method 1).The IWS can be run over the edge and hanging down on the fascia with a style L roof edgeover the roof edge and into the gutter (method 2). Finally the IWS can go under the style D roof edge and then it is sealed with a strip of IWS over the top (method 3).

Lulimet 08-20-2010 04:52 PM

Quote:

Originally Posted by dmc@RCR (Post 311004)
Always under the drip edge and behind the gutter.

This prevents ice and water from backing up under the drip edge and into the gap between the roof sheathing and fascia(gutter board).

That's how I did it when I roofed my home. :thumbup:

Roofing Expert 07-11-2011 05:04 AM

Quote:

Originally Posted by MJW (Post 311009)
What do you do when you have to replace the fascia and not the roof?

That is why I&W goes on top of the drip edge.

Hands down, I have to agree with dmc@RCR. The I&W should always be draped down the roof decking and onto the fascia; approximately 3-4 inches. This prevents any and all water and/or ice migration from getting onto the roof deck or into the soffit.
If and when the need to replace the fascia arises, you have to remove the gutter apron and cut the I&W to remove the gutter so you can get the the fascia anyway... Then, once the fascia is replaced you reinstall a narrow strip of I&W up under the starter shingle and over the existing I&W (that you just cut to remove gutter) and back down over the fascia as previously noted above.
This is how I've been doing it on new residential construction homes for the past 7 years, and how I've done it throughout my construction/roofing career for the past 30 years. :thumbup:


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