Standing seam roof install am I a idiot?
We have done a few standing seam projects over the years, but this latest one has me worried.
In the past I feel we have done a passable job, the clients have all recommended us to others etc. but this one is going to be more demanding, I think.
So, here are the job specs:
26 square
Hip roof, three valleys
4/12 pitch
one layer of newer three tabs the client is adamant about not tearing off
AMC Ken-Loc Standing seam is spec’d-16″ flat pan.
What are the accesories or tools that make a job “professional” in your opinion. Tips, tricks,avoiding oil canning etc. Any advice is greatly appreciated.
Naive but refreshing !
Replies
>>>one layer of newer three tabs the client is adamant about not tearing off
I know very little about SS roofing, but that strikes me as just plain weird. How can you tell that your strapping is fastened to good wood if you don't first peel off the shingles?
Scott.
Always remember those first immortal words that Adam said to Eve, “You’d better stand back, I don’t know how big this thing’s going to get.”
are you planning on strapping the roof? 1X? 2X? - I wouldn't consider putting metal directly on top of shingles, tho I've seen it done -
do you have the eve/rake detail figured out?
how straight is the roof? - I'd suggest pulling strings to see just how flat the planes of the roof are - check for square also and do any fudging at the rake and valley so the seams run perpendicular to the eves -
is your metal supplier able/availible to produce any custom flashing you need?
good luck -
As the metal moves with heating and cooling the shigles will erode the back side...they GOT to go or be isolated.
An owner can be just as adamant as they want but I an be more adamant than they. The only way to roof this over is to use purlins/strapping horizonatlly at whatever layout is needed to satisfy the manufacturer that wind up lift is prevented. Might be at 12" oC. That can be a lot of screws - and not Piffinscrews either! Must be structural screws.
If they want it direct, I walk away from the job.
Why?
It WILL telegraph the shingles.
It WILL wear out from the backside
It WILL cost more in labor to fasten and keep straight
It WILL look like hell
It WILL in all likelyhood void the manufacturers warrantee
When you do the detailing tht can run you into some extra work too.
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The first SS roof i ever did i made the mistake of using plastic cap nails on the felt. Some telegraphed through and you could see every one of them when there was dew on the roof. Its not hard to imagine how crummy that layer of shingles is going to look under the SS.
Metal roofs are amazingly unforgiving of poor substrates. I am used to using laminates and have had to really tighten up my standards for sheathing since I've started doing metal. Looks aside, I would also imagine it might be very hard to get the sections to lock if they have been screwed through different thicknesses of shingles.
I've only installed one standing seam roof, but it came out looking good and the clients were thrilled.
But the roof had already been sheathed in new plywood in the last 10 years and I cut in a bunch of new as well so it was nice and clean. Seems like everyone else is right that you'd be looking for trouble if you don't isolate those shingles at the minimum, and I agree with Piffin that as adamant as the homeowners are on keeping the shingles, you should be more adamant as the one who has to deal with the phone call the first time there's a problem with the roof, and your reputation on the line.
Standing seam is not a cheap product. Nor is it cheap to install. Why would someone want to cheap out on leaving the shingles on???
Good luck on the oilcanning. Lots of things can cause it. Machine running the product. Imperfect roof deck. Some panels have raised sections along the part that contacts the roof deck. This can help minimize the oilcanning.
Color, pitch of the roof, can make a difference.
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When I started doing a few metal roofs last year I asked for advice on getting clean cuts here on the forum. I took the advice and bought nibblers. Well worth the price.