Underlayment for Metal Roof

   / Underlayment for Metal Roof #21  
Can you put ice stops to slow the rumble?

In the mountains a lot of the new metal roofs have stops for ice and snow...
 
   / Underlayment for Metal Roof #22  
I've thought about it, but I don't want ice building up via freeze thaw cycles. Ultimately I want it all off the roof(s). The weight can be a factor over time. Last winter we had MASSIVE amounts of both snow and ice, then more of both. I have an atrium roof between old part of house and new addition that has radiant heat tubing under metal track that is thermostatically and rain/snow controlled. This allows for the gable ends to melt anything before it can stick, so it can't build up on the gable end walls.
 
   / Underlayment for Metal Roof #23  
My current house had Forrest Green metal put on the roof 8 years ago. I noticed darker colors fade more in hard sun. That might be okay but if you put on an addition the colors will be way off. My original roof vs. the new addition last year was noticeable but not terrible. To correct that I would have to replace all the old tin, so I took a closer look at it matched perfectly:laughing:

Around here, they went right over the shingles with the tin and worked out fine. For the addition I built it like a pole shed roof but used a thin insulation under the tin for condensation. I put in a foot or so insulation in the attic so noise isn't a problem.

Similar issues, but in our case, we had 3 year old pole barn with forest green metal roof and a 25 y/o house with a really badly sun degraded, rolled, cracked, stoneless asphalt roof, which we had replaced after a full 2years of interviewing roofers with small and large companies/crews.

We also ende up with a complete tear-off, which in our case revealed some big problems which had been atcleast partly camoflaged by the roofing materials.

That led to some repairs and then as was said by the OP, underlayment with a synthetic replacement for asphalt felt paper, which is significantly more waterproof and resilient.

Our local codes call for the ice dam barrier membrane for the bottom 3' or 4' of the roof above the edge.

Our house roof is standing seam, which is also synonymous with hidden fastener roofing.

I considered getting a crimped seam roof but my wife was worried about how hard it would make any future repairs.

Funny thing, we went driviing around looking for houses with metal roofs for months before we got ours done, so we coul ask the owners who did their roofs nnd would they use them again, and we actually found very few to compare.

Now about 4 or 5 months later, we see them everywhere.

God luck, now that we finally have ours, we love it.

BTW, for all those saying that metal roofs are hotter than asphalt, you couldn't be more wrong.

Metal roofs have a higher albedo, which means that they are more reflective, therefore there is less heat gain.

Also because they are raised off of the roof deck on batten boards or purlins, so that there is air flow under them, they actually create a convective air flow, which further helps to cool them.

Although we did have one yutz who called himself a roofer, who wanted to screw the metal panels directly to the roof deck, violating every principle of metal roof installation- we told him to go spit, and he was outraged that we didn't think he was doing us a favor by bidding on our job.

PPS: For barn and shed roofs, installing a vapor barrier and even a nominal 1" of fiberglass or foam board insulation goes a long way to prevent condensation from forming and raining down on the inside of it.

We have had a devil of a time keeping it from occurring in our wood shed, especially in midwinter thaws when the air temps get into the 40's or 50's but there is a foot or more of snow sitting up on top of the roof cooling it.

Our wood shed has a lean-to roof, but it isn't very steep, so snow sits on it for months...
 
   / Underlayment for Metal Roof #24  
Can you put ice stops to slow the rumble?

I've thought about it, but I don't want ice building up via freeze thaw cycles. Ultimately I want it all off the roof(s).

That is exactly what the Morton Buildings representative told me when I asked about a snow stop of some sort above the service door. I see them being used on a lot of metal roofs so I don't know who has the better idea.
 
   / Underlayment for Metal Roof #25  
Here are two pictures showing my cuddle-sack...

I built before the other homes and put in the road to the last house on the right looking towards the forest... thought about metal roofing and in the end couldn't justify the copper... I do have copper flashing, gutters, downspouts and all the exterior window sills are copper is is my z-flashing where the wood meets the stucco.

What is interesting is the first house on left is all copper roof with ice stops...

If you look closer you will see the kids playhouse... the roof was just put on that week and the kids playhouse roof is all copper and the fence around the yard is all stainless... stainless tubing with the welds polished out and stainless panels...
 

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   / Underlayment for Metal Roof #26  
Can you put ice stops to slow the rumble?

In the mountains a lot of the new metal roofs have stops for ice and snow...

We have seven "snow angels" over the stairs so it doesn't dump all at once.

Our home inspector said he's inspected 50 year old roofs in good condition.

Very popular with people who heat with wood also.

Ours has an underlayment to reduce noise and improve insulation.
 
   / Underlayment for Metal Roof #27  
Can you put ice stops to slow the rumble?

In the mountains a lot of the new metal roofs have stops for ice and snow...

We have seven "snow angels" over the stairs so it doesn't dump all at once.

Our home inspector said he's inspected 50 year old roofs in good condition.

Very popular with people who heat with wood also.

Ours has an underlayment to reduce noise and improve insulation.
 
   / Underlayment for Metal Roof #28  
New metal roofs are pretty slick. Where I live, some years the honey dew coming off the big sugar maples coats the roofs and slows the snow slide. In a heavy lake effect snow area, you want the snow to depart your roof, rumble or not. Most shedding is the slow ooze type, but I have seen sheets fly out twelve feet or so. The snow guards are usually used when there is a doorway directly underneath the snow path. Especially on businesses... where customers being knocked down to their knees by a hundreds of pounds of snow is a bad thing..... You learn not to walk next to your building in the winter, and put up with the rumble so you don't have to climb on the roof and shovel. :)
 
   / Underlayment for Metal Roof #29  
New metal roofs are pretty slick. Where I live, some years the honey dew coming off the big sugar maples coats the roofs and slows the snow slide. In a heavy lake effect snow area, you want the snow to depart your roof, rumble or not. Most shedding is the slow ooze type, but I have seen sheets fly out twelve feet or so. The snow guards are usually used when there is a doorway directly underneath the snow path. Especially on businesses... where customers being knocked down to their knees by a hundreds of pounds of snow is a bad thing..... You learn not to walk next to your building in the winter, and put up with the rumble so you don't have to climb on the roof and shovel. :)

Sounds awfully dangerous to me! Lawsuit waiting to happen, maybe.
 
   / Underlayment for Metal Roof #30  
That's why they starting putting snow guards on metal roofs. But now, natural selection no longer thins out the weak minded...... :)
 

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