3 layers shingles +metal
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3 layers shingles +metal (by Jen [OH]) Nov 7, 2018 2:56 AM
       3 layers shingles +metal (by David [MI]) Nov 7, 2018 2:58 AM
       3 layers shingles +metal (by Roy [AL]) Nov 7, 2018 3:09 AM
       3 layers shingles +metal (by David [MI]) Nov 7, 2018 4:04 AM
       3 layers shingles +metal (by Steve [MA]) Nov 7, 2018 4:12 AM
       3 layers shingles +metal (by gevans [SC]) Nov 7, 2018 4:15 AM
       3 layers shingles +metal (by myob [GA]) Nov 7, 2018 4:19 AM
       3 layers shingles +metal (by David [MI]) Nov 7, 2018 4:21 AM
       3 layers shingles +metal (by Ken [NY]) Nov 7, 2018 4:35 AM
       3 layers shingles +metal (by Steve [MA]) Nov 7, 2018 4:43 AM
       3 layers shingles +metal (by Doogie [KS]) Nov 7, 2018 5:05 AM
       3 layers shingles +metal (by Roy [AL]) Nov 7, 2018 5:11 AM
       3 layers shingles +metal (by Jen [OH]) Nov 7, 2018 5:52 AM
       3 layers shingles +metal (by Vee [OH]) Nov 7, 2018 6:54 AM
       3 layers shingles +metal (by Jen [OH]) Nov 7, 2018 6:58 AM
       3 layers shingles +metal (by Vee [OH]) Nov 7, 2018 8:06 AM
       3 layers shingles +metal (by Jen [OH]) Nov 7, 2018 8:09 AM
       3 layers shingles +metal (by myob [GA]) Nov 7, 2018 8:41 AM
       3 layers shingles +metal (by myob [GA]) Nov 7, 2018 8:41 AM
       3 layers shingles +metal (by Ken [NY]) Nov 7, 2018 8:59 AM
       3 layers shingles +metal (by Robert J [CA]) Nov 7, 2018 10:54 AM
       3 layers shingles +metal (by Robert J [CA]) Nov 7, 2018 10:55 AM
       3 layers shingles +metal (by RathdrumGal [ID]) Nov 7, 2018 1:04 PM
       3 layers shingles +metal (by Ed [PA]) Nov 7, 2018 5:02 PM
       3 layers shingles +metal (by fred [CA]) Nov 7, 2018 8:08 PM
       3 layers shingles +metal (by Britt [NC]) Nov 8, 2018 3:59 AM
       3 layers shingles +metal (by Sparky [PA]) Nov 8, 2018 5:32 AM
       3 layers shingles +metal (by Jen [OH]) Nov 9, 2018 8:33 AM
       3 layers shingles +metal (by Charlie [CT]) Nov 12, 2018 11:29 PM
       3 layers shingles +metal (by mike [CA]) Nov 15, 2018 7:53 AM

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3 layers shingles +metal (by Jen [OH]) Posted on: Nov 7, 2018 2:56 AM
Message:

Can you put metal over 3 layers in ohio? --74.141.xx.xx




3 layers shingles +metal (by David [MI]) Posted on: Nov 7, 2018 2:58 AM
Message:

Two layers of asphalt shingles is the limit --50.4.xxx.x




3 layers shingles +metal (by Roy [AL]) Posted on: Nov 7, 2018 3:09 AM
Message:

The first house I bought a metal roof for had 3 layers of worn-out shingles on it. Removing 3 layers would have been costly. 5 years ago, a metal roof was laid on top of it and since then I have had no problems. --68.63.xxx.xxx




3 layers shingles +metal (by David [MI]) Posted on: Nov 7, 2018 4:04 AM
Message:

Four layers of roofing, wow

Not tearing off the existing layer(s) reduces the lifespan of the new layer , that plus the additional uncertainty makes the savings compared to tear off a wash --50.4.xxx.x




3 layers shingles +metal (by Steve [MA]) Posted on: Nov 7, 2018 4:12 AM
Message:

Most places require a structural engineer to verify that the roof framing will support adding any more than 2 layers (original + 1 layover) of roofing before allowing it. --96.237.xx.xx




3 layers shingles +metal (by gevans [SC]) Posted on: Nov 7, 2018 4:15 AM
Message:

You might be able to get away with it...or the roof may collapse from the weight, killing whoever is inside.

Not worth the risk. Tear it off. --98.122.x.xx




3 layers shingles +metal (by myob [GA]) Posted on: Nov 7, 2018 4:19 AM
Message:

If you get snow let us know. How many were seriously hurt? --99.103.xxx.xxx




3 layers shingles +metal (by David [MI]) Posted on: Nov 7, 2018 4:21 AM
Message:

Steve, why would any structural engineer in their right mind sign off on something like that? --50.4.xxx.x




3 layers shingles +metal (by Ken [NY]) Posted on: Nov 7, 2018 4:35 AM
Message:

Ohio will have a heavy snow load which Roy wont have in AL,no way should you be putting another roof over 3 layers of shingles --72.231.xxx.xxx




3 layers shingles +metal (by Steve [MA]) Posted on: Nov 7, 2018 4:43 AM
Message:

I've never heard of one actually doing it. In my 50+ years of being in construction I've only done 2 lay over roofs. One was going to be torn down in 5 years & the other was as a favor for a friend who was suppose to do the job but had a health issue come up. IMO it's always best to strip the old roofing, refasten / replace the boarding, replace vent pipe boots, add base flashing around chimneys & in my area use I&W in valleys, around roof penetrations & at the eaves. --96.237.xx.xx




3 layers shingles +metal (by Doogie [KS]) Posted on: Nov 7, 2018 5:05 AM
Message:

I had a roof with 3 layers on it and needed replaced. I tore it all off. The weight from the 3 layers did cause damage to the structure over time. Since then, I don't want any more than 1 layer. This comes both from the damage it caused and also the job it was to tear off the 3 layers (I was the one tearing it off, it was in my younger and not so wiser days). --98.175.xxx.xxx




3 layers shingles +metal (by Roy [AL]) Posted on: Nov 7, 2018 5:11 AM
Message:

The house I am making reference to was built back in the 1930's when house builders knew how to build houses the correct way and did not use cheap Chinese building materials like today. The floor joists and beams in this house measure 4 inches wide by 12 and those are true dimensions from the saw-mill. I am not sure what the roof rafters are but I am sure they are heavy duty also.

We don't get a lot of snow down here but doesn't snow just slide down off of slick metal roof? My metal roof is so slick, you can't even walk up it without wearing special shoes. --68.63.xxx.xxx




3 layers shingles +metal (by Jen [OH]) Posted on: Nov 7, 2018 5:52 AM
Message:

It was the contractor that recommended this. He said no code in Ohio for maximum layers --74.141.xx.xx




3 layers shingles +metal (by Vee [OH]) Posted on: Nov 7, 2018 6:54 AM
Message:

You need to point your contractor to BOCA, there it is said that using dimensional shingles is 2 layers there fore when using them every roof job will be a tear off, look at the underside of the roof deck for splitting of the structural members - this is where it gets expensive tearing off the decking so you can sister or replace this wood. --76.188.xxx.xx




3 layers shingles +metal (by Jen [OH]) Posted on: Nov 7, 2018 6:58 AM
Message:

I just did a quick Google search of Boca. I found nothing that relates to roofing. But it sounds like bottom line you would not go over three layers with metal? Further conversation with contractor… 20 pounds per one square for metal versus 100 pounds per square of shingles. He is still highly confident that it is safe to do that. His further conversation is that snow is not going to stay on metal. Snow would slide right off. Furthermore he said it is a six pitch roof. According to him he said that’s somewhat steep --74.141.xx.xx




3 layers shingles +metal (by Vee [OH]) Posted on: Nov 7, 2018 8:06 AM
Message:

up.codes/viewer/ohio/ibc-2015/chapter/16/structural-design#1608 --76.188.xxx.xx




3 layers shingles +metal (by Jen [OH]) Posted on: Nov 7, 2018 8:09 AM
Message:

Thank you --74.141.xx.xx




3 layers shingles +metal (by myob [GA]) Posted on: Nov 7, 2018 8:41 AM
Message:

VEE You have lead them to water but they won't drink!!!! --99.103.xxx.xxx




3 layers shingles +metal (by myob [GA]) Posted on: Nov 7, 2018 8:41 AM
Message:

VEE You have lead them to water but they won't drink!!!! --99.103.xxx.xxx




3 layers shingles +metal (by Ken [NY]) Posted on: Nov 7, 2018 8:59 AM
Message:

Any roofer who told me that 3 layers plus a metal roof was ok I would question his knowledge of anything else related to the job --72.231.xxx.xxx




3 layers shingles +metal (by Robert J [CA]) Posted on: Nov 7, 2018 10:54 AM
Message:

Around some 20 years ago when a war was going on across the sea, all of the "building" materials were being shipped there so the cost of roof sheeting (plywood) and shingles were more than triple.

Plywood that previous sold for $6 per sheet was then $32 per sheet. Fiber glass shingles that were $6.88 per bundle was then $22.00 per bundle.

I had the City issue me a violation that my 5 homes on a lot needed their roofs replaced. So instead of spending $20,000 to replace all 5 roofs by a local contractor, the price was going to be $80,000.

So since I was a building contractor, I tried to get a temporary variance to strip off all but one layer of the old roofs, down to the wood shake, and then re-roof over the roof using rolled goods.

The city laughed in my face and said, "NO"!

So I did it anyways. Removed 3 of the 4 layers and rolled goods over the roof, using torch down modified roofing.

The City had a fit. They wanted to send me to jail. How dare I do anything without their express written permission.

I asked the Judge in the hearing room what would he do if his Starbucks coffee was going to cost him $20 per cup, instead of $3? Could anyone force him to pay $20, or would he find another way to temporary satisfy his need for coffee at an affordable price. Also the materials being sent oversees was to rebuild after the destruction, at tax payers expense.

SO the judge ordered that when the cost of materials comes back to a normal rate, at that time my circumstance should be reevaluated. I won. --47.156.xx.xx




3 layers shingles +metal (by Robert J [CA]) Posted on: Nov 7, 2018 10:55 AM
Message:

Around some 20 years ago when a war was going on across the sea, all of the "building" materials were being shipped there so the cost of roof sheeting (plywood) and shingles were more than triple.

Plywood that previous sold for $6 per sheet was then $32 per sheet. Fiber glass shingles that were $6.88 per bundle was then $22.00 per bundle.

I had the City issue me a violation that my 5 homes on a lot needed their roofs replaced. So instead of spending $20,000 to replace all 5 roofs by a local contractor, the price was going to be $80,000.

So since I was a building contractor, I tried to get a temporary variance to strip off all but one layer of the old roofs, down to the wood shake, and then re-roof over the roof using rolled goods.

The city laughed in my face and said, "NO"!

So I did it anyways. Removed 3 of the 4 layers and rolled goods over the roof, using torch down modified roofing.

The City had a fit. They wanted to send me to jail. How dare I do anything without their express written permission.

I asked the Judge in the hearing room what would he do if his Starbucks coffee was going to cost him $20 per cup, instead of $3? Could anyone force him to pay $20, or would he find another way to temporary satisfy his need for coffee at an affordable price. Also the materials being sent oversees was to rebuild after the destruction, at tax payers expense.

SO the judge ordered that when the cost of materials comes back to a normal rate, at that time my circumstance should be reevaluated. I won. --47.156.xx.xx




3 layers shingles +metal (by RathdrumGal [ID]) Posted on: Nov 7, 2018 1:04 PM
Message:

I live in North Idaho. We have lots of metal roofs and lots of snow. Snow does not slide off of metal roofs (unless it is a very steep roof -- think A frame cabins) WHILE IT IS SNOWING. The snow does avalanche off the roof once the storm has passed and the weather warms slightly. Be sure to have snow brakes installed over doorways unless you have covered porches. --98.146.xxx.xxx




3 layers shingles +metal (by Ed [PA]) Posted on: Nov 7, 2018 5:02 PM
Message:

Roofs are designed for a dead load plus a live load. Dead load consists of the joists, wood sheeting and two layers of shingles. The live load is an expected heavy snow load for the region the house was built.

Snow does stick to metal roofing.

Three layers of shingles with a heavy snow is already causing excessive deflection that will cause structural damage. An additional metal layer with a bad snow can certainly cause catastrophic failure that may cause injury or loss of life.

Run away from that roofer, he doesn't have any idea what he is doing. --96.235.xx.xx




3 layers shingles +metal (by fred [CA]) Posted on: Nov 7, 2018 8:08 PM
Message:

I would never put a new roof over 1 layer, 2 layers, 3 layers, not only because the code prohibits it, but because:

- the weight

- if there are deficiencies in the old roofs (and there are many), why bury them?

- looks.

--99.59.x.xxx




3 layers shingles +metal (by Britt [NC]) Posted on: Nov 8, 2018 3:59 AM
Message:

In my experience, it's cheaper in the end to just do it right. So NO! --71.210.xx.xxx




3 layers shingles +metal (by Sparky [PA]) Posted on: Nov 8, 2018 5:32 AM
Message:

Get a second opinion from a comment metal roof installer. --174.229.xx.xxx




3 layers shingles +metal (by Jen [OH]) Posted on: Nov 9, 2018 8:33 AM
Message:

Thank you to all. Doing a complete tear off --74.141.xx.xx




3 layers shingles +metal (by Charlie [CT]) Posted on: Nov 12, 2018 11:29 PM
Message:

The lad in Bridgeport was right..”There is a sucker born every minute”................. Charlie.......................,,,,,,,,,,,,,,,,,every one minute! Or is that,every second..........,,,,,,,........,,, ,,,,,,,,,,,, ............ --32.214.xxx.xx




3 layers shingles +metal (by mike [CA]) Posted on: Nov 15, 2018 7:53 AM
Message:

i've roofed over 400 homes for clients and few for myself.

several moving parts here

1. no municipality allows four that i know of.

2. their issue is weight, but by the time the old roofs got to the point of being re-covered the reflective granules were long gone and the oils were cooked out so the presumed weight was nowhere near the actual. the likelihood of a collapse is less than you'd imagine so if you want to go ahead.

3. you might be fine doing it yourself but i know of no contractors that will add a fourth. they have presumed knowledge of the code and there's no defense even if the owner signs an instruction and waiver.

4. with three roofs in place there have SURELY been slapdash and stopgap repairs over the decades. this is the chance to remedy them as well as get a nice new roof with the improved modern materials.

from an owners angle the need for a tearoff is clear...the roofs have been there for at least 60 years and the roof deck and framing as well as fascias and undereaves need to be properly repaired. proper thorough repairs can be done most rapidly and at the least expense ONLY when the roof is exposed. think of this as your chance to get the shack ready for the next 6 decades. while repairing the sins of past owners and tradesmen.

for pitched roofs with asphalt comp i spec full tearoff and rehab of all carpentry, UDL underlayment, GAF elk lifetime shingles, all new metals and ohagins vents as needed. for the flat roofs i spec a 2 ply dibiten torchdown with all new metals. i AM considering going to a one ply dibiten and going to a silicone coating at 7-8 years. the GE scm3502 can be rolled right over a clean surface w/o primer. i have used the GACO silicone with good results as well and like that it goes on FAST and is SPECIFICALLY RATED FOR PONDING WATER...something we see on lots of flat roofs --76.176.xxx.xxx



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