Underlayment for Metal Roof

[Paul Thornton]

Curling off of the porch roof.

 

[KYErik]

Although it makes installation more difficult (tight fasteners will spread the metal), I have done 4 roofs with driving the exposed metal screws through the rib of the roofing metal. Metal needs to be predrilled or punched to start the screws on the ribs but keeping the screws out of the water channels greatly reduces the risk of leaks if you don't want to spend big bucks on standing seam/hidden fasteners.

 

[PAGUY]

I don't have a metal roof but a rubber roof on a roof with a slight pitch. The roofer added plastic plates using an adhesive to prevent snow slide but last winter most came loose when the sun hit the build up snow and it came off the roof with a rumble. I didn't worry about the result as I would rather have the snow/ice come off and not build up from added snow falls. The semi-flat roof is on the southern end of the house with sun exposure all day when the sun shines in the wintertime. The rest of the house has a typical shingled (40 yr) roof.

 

[jfh28]

yup....snow guards are for the safety of people walking below......not for the roof.......when the snow layer against the metal starts to melt and that build up of snow lets go it can be quite dangerous as it falls all at once.........personally I have found the mechanically fastened type of snow guards work better then the adhesive applied ones........Jack

 

[ultrarunner]

Most of the traditional Alpine Chalet style roofs are low slope designed to keep snow in place...

I don't have a picture with the roof loaded... but, it does happen.

 

[PhysAssist]

Although it makes installation more difficult (tight fasteners will spread the metal), I have done 4 roofs with driving the exposed metal screws through the rib of the roofing metal. Metal needs to be predrilled or punched to start the screws on the ribs but keeping the screws out of the water channels greatly reduces the risk of leaks if you don't want to spend big bucks on standing seam/hidden fasteners.

We limited the snow stops on our new roof to over the openings exactly because they have to be screwed into the roof, and then we chose the solid bar type of snow stop because it got screwed to the top of the ridges on the affected roof areas.

To quote my uncle on the subject: "I didn't spend all that money on a hidden fastener roof to have them put screw holes in the flats..."

 

[tow653]

We have a hidden fastener,raised seam roof and love it. Ice stops are not only for safety,but also to save your gutters,almost lost our the first year before I got ice stops installed,and they clamp to the raised seams,no screws. Only penetration is the plumbing vent and plumber hooked all together so only one.

 

[PhysAssist]

Most of the traditional Alpine Chalet style roofs are low slope designed to keep snow in place...

I don't have a picture with the roof loaded... but, it does happen.

I don't have one of our house either, but once it got snow on it last winter, it had it there until we got the final thaw in, what April or May last spring...

I better have similar snow coverage this year [if we ever get any], or I'm gonna be calling the roofer to find out what he did to my ventilation.

 

[PhysAssist]

We have a hidden fastener,raised seam roof and love it. Ice stops are not only for safety,but also to save your gutters,almost lost our the first year before I got ice stops installed,and they clamp to the raised seams,no screws. Only penetration is the plumbing vent and plumber hooked all together so only one.

I was hoping for a system like yours, but no roofer around here ever heard of a clamp-on system.

It was bad enough trying to get one to agree to doing a metal roof in the first place, then we had to find one that had done standing seams, and then all they had ever done was either the screw-onto-the-ridges snow bars, or screw-into-the-flats snow angels.

We neither liked the look nor the idea of screws into the flats, hence we went with the snow bars- but just the shortest section over each of the doors that we could get away with.

 

[DuckSlayer1017]

We put an aluminum shingle roof on our cottage back in August. They definitely don't give that stuff away but it is guaranteed forever and will not rust like most of the steel roofs. The steel has good warranties for corrosion, don't get me wrong, but they do allow rust within 1" of a cut. For underlayment we used a high temp ice and water shield used for metal roofs over the entire roof. Mainly because it was a 3/12 pitch and then a synthetic underlayment on top of that made by Talon. Here is a pic just after the first few courses were laid, sorry I don't have any pics of the finished roof.