Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
Gadgetman

question regarding ice and water layer on roof

11 posts in this topic

So my 15 year old house is going to be getting its 3rd roof shortly due to another hail storm. My question is how many layers of ice and water can one roof hold? Should the old layers be pealed off or do you just keep putting new layers over the old layers?. I am wondering if it isnt going to show a noticeable hump where the end of the I and W ends. Anybody have the answer?

Share this post


Link to post
Share on other sites

You can only install one layer of shingles over the top of another layer of shingles. A complete tear off should be in your future if I understand your question correctly.

Otherwise, Ice and water shield is normally applied to the bottom edge of roof, depending on how much overhang your house has. I believe it has to be 3' in from the edge of the house (where heat loss occurs), but don't quote me on that. One of the roofers on the site can give the actual number.

As far as taking off the Ice and Water shield, it should be removed down to the sheeting, and reinstalled. There will be no "hump" since there will be more layers over the top of it, think overlapping shingles, and will not be visible.

Share this post


Link to post
Share on other sites

There was a change in the code last year that said you can no longer shingle over any previous roofing. Our building official now makes us remove the weather guard down to the sheeting. If you can not remove it, he makes us replace the plywood. Hope this helps.

Share this post


Link to post
Share on other sites

Only one layer of shingles can be on a roof now. No over-lays.

I&W cannot be removed and replaced. The sheathing can be replaced, but that is not the common practice. Another layer is put over the previous layer of I&W or you can possibly get by with just adding a layer of tar paper over it (best bet and I'll tell you why). The shingles will adhere to the I&W, making it almost impossible to remove the shingles. This stuff has made more work for roofers than any other product ever made.

Code is 2 ft. past interior wall line. This may be changed soon to one foot inside warm wall line, but for now it is 2 feet. Now, this depends on pitch......blah blah blah (if you need the info, I will give it out)

To answer the question, I would ask the building official what they want done. IMO, another layer is not needed, but if the insurance pays for it, you better be putting it on. If they pay to take up the sheathing, then you better be doing that. If the building official says to pull up the sheathing and replace, I would get the adjuster involved in paying for it ($95 per sheet).

Share this post


Link to post
Share on other sites

Its a pain staking job to pull off I&W shield off OSB and you'll end up taking chunks of wood along with it so your better off leaving it on. Two layers you won't notice, three layers you might. However its a lot easier to pull a second layer of I&W shield off the first. You'll either have a mineral or plastic film on top. You could always feather that transition out with a row of singles before you lay down the felt.

Code is 2' up the roof past the wall. Heres the concern, its thought that the I&W membrane can trap moisture coming from the interior thus the though of changing that to 1'. That concern would be on older homes with no vapor barriers, poor attic ventilation, and little insulation. Of coarse the above is prime for Ice Dams and IMO needs the 2' coverage above the wall.

Share this post


Link to post
Share on other sites

Only one layer of shingles can be on a roof now. No over-lays.

Are you sure about that?

If i am not mistaken you can go 2 layers of asphalt shingles unless you are in the hail damage zone.Although I do not do layovers I am pretty cretain you can do it in certain areas.

Share this post


Link to post
Share on other sites

You are right [YouNeedAuthorization]. The hail zone covers much of the state and that was the code last year. Not sure if they updated the map or codes on that or not. I would be willing to bet that if you get a permit, the building inspector will require a tear off. If it is an insurance claim, a tear off would be mandatory. The mortgage company and insurance company will be sure that it is torn off and reshingled before the final (depreciation) check is sent out.

Share this post


Link to post
Share on other sites

Thanks for the help guys. I am not going to shingle over the existing shingles, never liked that idea. I am just concerned about the ice and water layer at the bottom of the roof. It occurred to me that taking it off will probably wreck the sheeting below it, and taking the sheets off has to be a royal pain. Roofer, you never finished your reason for putting down a layer of tar paper over the existing ice and water. Insurance is paying for it so i am not interested in cutting any corners.

Share this post


Link to post
Share on other sites

You'll find out when you tear off the shingles. I don't want to give away any trade secrets. wink

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • You would get what you deserve if he does do what he says he's going to do. You would get to pay for a wall, probably watch your children or grandchildren go to war, pay for his infrastructure spending, you'll still get some kind of government sponsored healthcare, more gun control and I can only imagine what else.
    • You don't seem to get it at all. It's all about what these candidates stand for. If trump would completely change his stances (again) to be closer to what the Libertarians stand for then yes you may have a point. With his current views I would not be a Trump supporter and would hope he would have no way of gaining the Libertarian party nomination. 
    • But yet you can't answer PF's question. If you can't think of any you admire, why should he be able to? That question is like the infamous, "If you could be a tree, what kind of tree would you be?" Stupid questions don't deserve an answer. At least he didn't say Putin.  
    • OK, here is your big chance to get some land away from the evil state government and back into private hands.    And help out the schools and fight cronyism at the same time.    (the requirement you need to be there to bid is clearly a crony deal in my opinion) The Department of Natural Resources will sell 40 northern Minnesota parcels in three public oral bid auctions in October and November. Tuesday, Oct. 25 – Nine northwestern Minnesota parcels will be auctioned at the County Administration Building in Bemidji. Thursday, Oct. 27 – 27 northeastern Minnesota parcels will be auctioned at the Lake County Courthouse in Two Harbors. Thursday, Nov. 3 – Four parcels in north-central Minnesota will be auctioned at DNR Brainerd area office. The properties include unimproved recreational land and residential lakeshore parcels in Aitkin, Cass, Clearwater, Cook, Crow Wing, Hubbard, Itasca, Lake, and St. Louis counties. There is a wide range of sizes and land uses in this selection of sales, from a small 0.80 acre former water access site on Pine Lake in Clearwater County to a 200-acre recreational parcel in Breitung Township in northeastern St. Louis County. The DNR regularly sells land which is no longer needed for its original conservation purpose, after a thorough internal review, and after giving state agencies and local governments opportunities to purchase the land. Proceeds from sales of lands the DNR had once acquired go to the DNR division that had managed the land and are used to purchase and develop lands better suited to that division’s conservation goals. Many of the parcels to be sold are School Trust lands. Proceeds from these auction sales are deposited to a fund that benefits the state’s public school system. School Trust land by law can only be sold at public auction.
      Bidders are advised to obtain and view the property data sheet, be familiar with the property, minimum bid price, and terms and conditions of sale prior to attending the auction. To obtain a property data sheet or terms and conditions of sale call 651-259-5432, or 888-646-6367 or email landsale@dnr.state.mn.us. The property data sheets are also available online at www.dnr.state.mn.us/lands_minerals/landsale/.
    • Watch the video.  He didn't say "I don't find much to admire...."   He said "uh... I'm having an Aleppo moment... maybe the guy that used to be president of mexico.... then weld said "Fox" and he said "yeah, Fox"   You had to see it to believe it.    
    • Who are the world leaders you admire the most? Feel free to name them . Personally I can't think of any I have admiration for
  • Our Sponsors