Lean to on Pole barn what to do for Flashing?

[jeremywrags]

Hi All,

I have a 30x40 pole barn that, surprise has become to small... I plan on building a 12ft wide lean to on the side. My pole barn has 14ft side walls and concrete floor. For the lean to my plan was to make the side walls 10ft and do compacted gravel since all I will use it for is my boat and all the dirty stuff, lawn mover, weed eater, tractor, stuff like that. I have two questions.

1. To attach the roof to the current pole barn I planned on using a 2x6 along the horizontal at around the 12ft mark and lagging it to the existing poles of my barn. Then the wall of the lean to would be at around 10ft giving me the slope of the roof. Is that an acceptable method to use to support the weight of the rafters? Or do I need to set poles for the lean to on the 12ft side as well as the 10 ft side? My concern is that a 2x6 will only give me 2in of support for my 2x6 rafters.

2. What do I use as flashing to connect the new lean to roof to the side wall of the pole barn to prevent water from getting in? The current pole barns walls are the typical corrugated metal that most barns seem to be made from.

Appreciate any input

Thanks

 

[tjdux]

There are metal trim peices designed just for this application.

It never hurts to overbuuild a ledger board. For the peice difference the peace of mind bought by upgrading to 2x8 or 10 and then being able to use more lags or actually dme through bolts is probably worth it.

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[Zeke]

I don't think the above flashing is for corrugated siding.
The OP will need something like this, reversed:

A better way to do it would be to make a horizontal cut along the siding and slip some roof-to-wall flashing under. In fact, not removing the siding under the ledger will create a crush when the lags are tightened.

 

[jeremywrags]

I had not thought about the crush, that is a great point and a shame... I have rigid foam insulation on the inside of the pole barn that will make cutting the metal away a nightmare.

I don't think the above flashing is for corrugated siding.
The OP will need something like this, reversed:

A better way to do it would be to make a horizontal cut along the siding and slip some roof-to-wall flashing under. In fact, not removing the siding under the ledger will create a crush when the lags are tightened.

 

[Radix2]

You could use a holesaw and spacers to solve the crush problem.

How much space above lean to roof and main roof?

You really need to get behind walls for flashing anyway- but what about adding a second layer of metal from the lean roof up to the main? You may be able to return it to the same channel as your current at the eves (do you have overhangs?)

 

[astroracer]

You may want to go 2 x 8 to cover that 12' span. What kind of snow load do you see in OK.? If you go 2 x 8 you "could" bump your span to 14' and be safe.
To do this easily you need to tuck the lean to roof right up under the existing eves. Then you can flash under the eve trim to seal it up. Making the lean to 12' at the low point isn't a bad thing, is it?
Mark

 

[tjdux]

That flashing will work for corgated siding. It goes under the vertical and over the sloped. Water doesnt travel uphil and the flashing keeps shiplaps and should work fine. The product image shows prorib siding because thats more popular in my opinion.

Also probably just have to cut out the siding where the ledger board is. I don't think crushing the siding especially with foam board behind it is going to be a strongest connection.

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Item description specifically says for lean too. Now it doesn't asthetically match the corigated look but depending on the other trim on the building